Engine box body structure

Abstract

The utility model discloses an engine box body structure, which belongs to the technical field of motorcycle engines and comprises a first box body, the first box body comprises an air cylinder body matching surface, a first labyrinth separation cavity is arranged at one end of the air cylinder body matching surface, and the first labyrinth separation cavity comprises an air inlet channel and a flow dividing cavity. An air inlet is formed in the side, away from the flow dividing cavity, of the air inlet channel and located on the first axial end face of the first box body, and an air outlet is formed in the side, away from the air inlet channel, of the flow dividing cavity and located on the second axial end face of the first box body. According to the scheme, the labyrinth separation cavity is arranged at the edge position of the matching surface of the cylinder body, so that the box corner position of the box body is reasonably utilized, and the size of the labyrinth separation cavity can be designed to be larger as much as possible, thereby improving the separation effect of an oil-gas mixture in the labyrinth separation cavity.

Description

TECHNICAL FIELD

[0001] The utility model relates to a box structure more specifically, it relates to an engine box structure. BACKGROUND

[0002] During the operation of the engine, heat is generated inside the engine, causing the gases inside the engine to heat and expand, accompanied by the generation of exhaust gas. However, the engine is not completely sealed, so the exhaust gas will be discharged through the gaps in the engine box. In addition, there is also splashed oil inside the engine. After the oil and exhaust gas are mixed, an oil-gas mixture is formed, and the oil will be carried away from the engine box along with the exhaust gas, resulting in oil loss. Therefore, a labyrinth-type structure for separating oil and gas is generally designed on the engine box. However, the volume of the labyrinth-type oil-gas separation cavity in existing engines is relatively small, and the residence time of the oil-gas mixture in the labyrinth cavity is relatively short, resulting in poor oil-gas separation effect.

[0003] For example: Chinese patent publication No. CN116877230A, published on October 13, 2023, with the invention name of an engine and a motorcycle, which discloses a labyrinth structure in the crankshaft chamber of the engine. When the oil-gas mixture rises to enter the inner cavity of the labyrinth structure through the labyrinth air inlet, the gas passage path is lengthened to stabilize the airflow when the oil-gas mixture reaches the labyrinth air inlet, reduce the density, and increase the oil-gas separation reliability. However, this scheme arranges the labyrinth structure in the middle position of the upper box, including the labyrinth air inlet, the labyrinth air outlet, and the labyrinth oil return hole. The labyrinth oil return hole is located at the connection position of the first cylinder and the second cylinder. This scheme has many labyrinth structure components, and it is not possible to design a larger labyrinth structure in the middle position of the box, resulting in a decrease in the labyrinth oil-gas separation effect. UTILITY MODEL CONTENTS

[0004] The utility model overcomes the problem of poor oil-gas separation effect in the existing engine box and provides an engine box structure. This scheme reasonably arranges the oil-gas separation cavity in the engine box, effectively increases the oil-gas separation path, and improves the oil-gas separation effect.

[0005] In order to solve the above technical problems, the utility model discloses the following technical scheme: A kind of engine box structure, including first box, the first box includes cylinder block cooperation face, first labyrinth separation cavity is provided at one end of the cylinder block cooperation face, the first labyrinth separation cavity includes intake passage and shunt chamber, the intake passage is away from the shunt chamber side and located the first axial end surface at first box is equipped with air inlet, the shunt chamber is away from the intake passage side and located the second axial end surface at first box is equipped with air outlet. First labyrinth separation cavity can separate oil-gas mixture, oil-gas mixture is expanded after heating, enters intake passage from air inlet, then is shunted along shunt chamber, finally is discharged from air outlet, realize the separation of oil liquid. The present scheme arranges labyrinth separation cavity at the edge position of cylinder block cooperation face, not only reasonably utilizes the box edge corner position, and can make the volume of labyrinth separation cavity as large as possible design, to improve the separation effect of oil-gas mixture in labyrinth separation cavity.

[0006] As preferred, a first shunt plate is arranged in the shunt chamber, the first shunt plate is arranged at the output end of the intake passage, one end of the first shunt plate is connected with the inner wall of the first box, and the other end is separated from the inner wall of the shunt chamber. The first shunt plate is arranged at the output end of the intake passage, and the first shunt plate is arranged at the output end of the intake passage. The first shunt plate is arranged at the output end of the intake passage, and the first shunt plate is arranged at the output end of the intake passage.

[0007] As preferred, a shunt port is arranged at the connection between the first shunt plate and the first box, and the shunt port is arranged at the first axial end surface of the first box. The shunt port between the first shunt plate and the inner wall of the first box can pass a part of the oil-gas mixture, thereby improving the flow effect of the oil-gas mixture.

[0008] As preferred, a first baffle protrusion is arranged on the first shunt plate towards the intake passage, and the first baffle protrusion is arranged close to the shunt port. The first baffle protrusion can hinder the flow of the oil-gas mixture, so that a part of the oil-gas mixture flows to the shunt port, and a part of the oil-gas mixture flows to the shunt chamber, thereby improving the collision effect of the oil-gas mixture in the first labyrinth separation cavity, and further improving the separation effect of the oil-gas mixture.

[0009] As preferred, a second shunt plate is further arranged in the shunt chamber, one end of the second shunt plate is connected with the inner wall of the first box and is provided with an air vent, the air vent is arranged at the first axial end surface of the first box, and the other end of the second shunt plate is connected with the inner wall of the shunt chamber. The oil-gas mixture entering the shunt chamber will finally be discharged through the air vent between the second shunt plate and the inner wall of the first box, and finally discharged outside the box.

[0010] As preferred, a partition plate is arranged between the second flow distribution plate and the first flow distribution plate, one end of the partition plate is connected with the inner wall of the flow distribution cavity, and the other end is separated from the inner wall of the first tank. The partition plate separates the first flow distribution plate and the second flow distribution plate, forms an airflow channel in the flow distribution cavity, and prolongs the flow path of the oil-gas mixture.

[0011] As preferred, the gas outlet is arranged on the side of the second flow distribution plate away from the first flow distribution plate, and the gas outlet is arranged close to the air inlet. The first flow distribution plate, the second flow distribution plate, and the partition plate are all arranged obliquely downward from the inner wall of the flow distribution cavity to the inner wall of the first tank. The gas outlet is used for discharging the separated oil-gas mixture, mainly discharging exhaust gas. After the oil-gas mixture is discharged from the air inlet, it is discharged into the gas outlet. The oil mainly stays in the flow distribution cavity. The oblique arrangement of the first flow distribution plate, the second flow distribution plate, and the partition plate is conducive to the backflow of the oil.

[0012] As preferred, the side of the second flow distribution plate away from the first flow distribution plate forms an air outlet cavity with the first tank. The gas outlet is arranged in the air outlet cavity. A second baffle protrusion is arranged in the air outlet cavity and on the inner wall of the first tank. The side of the second baffle protrusion away from the gas outlet forms a buffer cavity. The air outlet cavity is the last storage cavity of the oil-gas mixture, which is discharged through the gas outlet. The second baffle protrusion can also improve the separation effect of the oil-gas mixture in the air outlet cavity. The buffer cavity can buffer the pulse-type oil-gas mixture and temporarily store the oil-gas mixture, which is finally discharged from the gas outlet.

[0013] As preferred, the air inlet channel is arranged on one side of the inner wall of the first tank, and the input end of the air inlet channel extends towards the bottom of the first tank. The air inlet channel is arranged on the inner wall of the first tank, and the output end of the air inlet channel is close to the bottom of the first tank, which is conducive to the backflow of the oil and prevents the backflow of the oil from splashing.

[0014] As preferred, a second tank is further arranged to be matched with the first tank. A sealing gasket is arranged between the first tank and the second tank. A second labyrinth separation cavity is arranged on the second tank corresponding to the first labyrinth separation cavity. A communication hole is arranged on the sealing gasket corresponding to the first labyrinth separation cavity. The oil-gas mixture in the first labyrinth separation cavity of the first tank also enters the second labyrinth separation cavity of the second tank through the communication hole on the sealing gasket, further improving the separation effect of the oil-gas mixture. The structure of the second labyrinth separation cavity is similar to that of the first labyrinth separation cavity.

[0015] Compared with the prior art, the oil-gas separator has the advantages that: (1) the oil-gas separation cavity in the engine box is reasonably arranged, the oil-gas separation path is effectively increased, and the oil-gas separation effect is improved; (2) the separation and backflow of the oil are achieved through the same channel, the backflow channel is not additionally arranged, and the volume of the box or the separation cavity is increased or reduced; (3) the bottom of the air inlet channel extends to the bottom of the box, so that the backflow of the oil can be prevented from splashing; and (4) the baffle protrusion structure can improve the collision of the oil-gas mixer in the separation cavity, and the oil-gas separation effect is improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a first box body structure schematic view of the utility model.

[0017] Figure 2 It is Figure 1 It is an enlarged schematic view of A.

[0018] Figure 3 It is a structure schematic view of the first labyrinth separation cavity of the utility model.

[0019] Figure 4 It is an explosion schematic view of the first box body and the second box body of the utility model.

[0020] Figure 5 It is another view structure schematic view of the second box body of the utility model.

[0021] In the drawing: 1. first box body, 2. cylinder body cooperation face, 3. first labyrinth separation cavity, 4. air inlet channel, 5. separation cavity, 6. first axial end face, 7. second axial end face, 8. air inlet, 9. air outlet, 10. first separation plate, 11. separation port, 12. first baffle protrusion, 13. second separation plate, 14. air vent, 15. separation plate, 16. air outlet cavity, 17. second baffle protrusion, 18. buffer cavity, 19. second box body, 20. sealing gasket, 21. second labyrinth separation cavity, 22. communication hole, 23. gas storage cavity. DETAILED DESCRIPTION

[0022] The technical scheme of the utility model will be further specifically explained below by means of specific embodiments and in combination with the drawings.

[0023] Embodiment 1: as Figures 1 to 3The shown engine block structure includes a first block 1, a cylinder (not shown in the figure) structure is connected on the cylinder block matching surface 2 of the first block 1, the cylinder is arranged at the middle position of the cylinder block matching surface 2, a first labyrinth separation cavity 3 is arranged at one side of the cylinder block matching surface 2 and also at the front end of the engine, that is, the first labyrinth separation cavity 3 is arranged at the corner position of the first block 1, since the main structures such as crankshaft and gear are installed inside the first block 1, the middle part of the first block 1 is a circular cavity, so that the size of the corner position of the first block 1 can be fully utilized for the first labyrinth separation cavity 3, so that the first labyrinth separation cavity 3 can be designed to be longer, and the first labyrinth separation cavity 3 arranged at the corner position can also improve the aesthetic effect of the engine block.

[0024] The front end surface of the engine is the right side (the orientation shown in the figure) end surface of the first block 1, the front end surface of the engine is close to vertical with the cylinder block matching surface 2, the first labyrinth separation cavity 3 includes an air inlet channel 4 and a flow separation cavity 5, the air inlet channel 4 is located at the middle position of the front end surface, the air inlet channel 4 is arranged obliquely according to the inner wall of the first block 1, the bottom of the air inlet channel 4 is provided with an air inlet 8, the bottom of the air inlet channel 4 extends to the bottom (the lower position shown in the figure) of the engine block, so that the air inlet 8 of the air inlet channel 4 can be close to the inner wall of the first block 1 and also close to the bottom of the first block 1; the top of the air inlet channel 4 is in communication with the flow separation cavity 5, and the top of the flow separation cavity 5 is provided with an air outlet 9. After the oil-gas mixture in the engine block is heated and expanded, it enters from the air inlet 8 of the air inlet channel 4, then moves upward along the air inlet channel 4, enters the flow separation cavity 5, and after being separated by the flow separation cavity 5, the oil in the oil-gas mixture is mostly separated, mainly remaining exhaust gas components, and finally discharged from the engine block through the air outlet 8.

[0025] It should be noted that the first block 1 includes a first axial end surface 6 and a second axial end surface 7, the first axial end surface 6 and the second axial end surface 7 are two axial end surfaces of the first block 1, the air inlet 8 of the air inlet channel 4 is located at one side of the first axial end surface 6, the air outlet 9 is located at one side of the second axial end surface 7, and the axial depth of the flow separation cavity 5 and the air inlet channel 4 is adapted to the overall axial size of the first block 1, so as to increase the volume of the first labyrinth separation cavity 3 as much as possible, increase the accommodation space of the oil-gas mixture, reduce the flow rate of the oil-gas mixture, increase the residence time of the oil-gas mixture in the first labyrinth separation cavity 3, and improve the oil-gas separation effect.

[0026] A first flow distribution plate 10 is arranged in the flow distribution cavity 5 and at the output end of the gas inlet channel 4. One end of the first flow distribution plate 10 is connected to the inner wall of the first tank 1, and the other end is spaced from the inner wall of the flow distribution cavity 5. In this way, when the oil-gas mixture is output from the gas inlet channel 4, the first flow distribution plate 10 can guide the oil-gas mixture into the flow distribution cavity 5. A flow distribution port 11 is arranged at the connection position of the first flow distribution plate 10 and the first tank 1. The flow distribution port 11 is located on the side of the first axial end face 6. A first baffle protrusion 12 is further arranged on the first flow distribution plate 10. The first baffle protrusion 12 is located on the side of the flow distribution port 11. When the oil-gas mixture reaches the output end of the gas inlet channel 4, part of the oil-gas mixture enters the inside of the flow distribution cavity 5 through the flow distribution port 11, and the other part of the oil-gas mixture enters the inlet of the flow distribution cavity 5 under the action of the first flow distribution plate 10. The first baffle protrusion 12 can block and guide the oil-gas mixture at the output end of the gas inlet channel 4, guide the oil-gas mixture to the side of the flow distribution port 11, and improve the collision effect of the oil-gas mixture and the baffle structure, thereby improving the oil-gas separation effect.

[0027] The second shunt plate 13 is integrally connected with the first tank 1 at one end, and is integrally connected with the first tank 1 at the other end. However, the second shunt plate 13 and the first tank 1 are provided with a gas vent 14 at the connection position. The gas vent 14 is arranged on the first axial end surface 6 of the first tank 1. The inner wall side of the first tank 1 protrudes towards the side of the shunt cavity 5 at the position of the first shunt plate 10. A narrow channel is formed on the side of the shunt cavity 5 close to the gas vent 14, thereby increasing the flow rate of the oil-gas mixture. It can be understood that in the present scheme, the gas inlet 8, the shunt port 11 and the gas vent 14 are all located on or close to the first axial end surface 7 of the first tank 1. Therefore, the overall diameter size of them is much smaller than the axial size of the first tank 1. When the oil-gas mixture flows through these gas ports, the flow rate of the oil-gas mixture is increased, thereby improving the separation effect of the oil-gas mixture. The axial size of the shunt cavity 5, the gas inlet channel 4 and other structures is close to the axial size of the first tank 1. In this way, the volume of the first labyrinth separation cavity 3 can be increased as much as possible, the flow rate of the oil-gas mixture in the shunt cavity 5 is slowed down, the oil-gas mixture stays for a longer time, and the attachment effect of the oil in the cavity is improved. A gas storage cavity 23 is formed between the partition plate 15 and the second shunt plate 13, which can accommodate a certain amount of oil-gas mixture, thereby increasing the volume of the shunt cavity 5 and prolonging the residence time of the oil-gas mixture.

[0028] The side of the second shunt plate 13 away from the partition plate 15 is an air outlet cavity 16. The air outlet cavity 16 is communicated with the shunt cavity 5 through the gas vent 14, that is, the oil-gas mixture in the shunt cavity 5 enters the air outlet cavity 16 through the gas vent 14. The gas outlet 9 is arranged in the air outlet cavity 16. A second baffle protrusion 17 is arranged in the air outlet cavity 16 and on the inner wall of the first tank 1. Specifically, the second baffle protrusion 17 is arranged on the inner wall where the cylinder matching surface 2 is located. One end of the second baffle protrusion 17 is connected with the inner wall of the first tank 1, and the other end of the second baffle protrusion 17 is separated from the second shunt plate 13. In this way, a buffer cavity 18 can be formed on the side of the second baffle 13 away from the gas outlet 9. In the engine tank, the oil-gas mixture flows intermittently in the form of pulses. The buffer cavity 18 not only can store the separated oil-gas mixture, but also can buffer the gas.

[0029] It should also be noted that in this invention, the discharge channel of the oil-gas mixture is also the return channel of the oil. That is, the oil separated in the splitting chamber 5, the outlet chamber 16, and the intake channel 4 will all flow back along the original path of the chamber, and finally flow back into the engine housing from the intake port 9 of the intake channel 4. Therefore, the first splitting plate 10, the partition plate 15, and the second splitting plate 13 are arranged at a certain angle. Specifically, the first splitting plate 10, the partition plate 15, and the second splitting plate 13 are arranged inclined downwards from the inner wall of the splitting chamber 5 to the inner wall of the first housing 1.

[0030] Example 2: Figures 1 to 5 An engine housing structure is shown, including a first housing 1 and a second housing 19, which are adapted to each other. A sealing gasket 20 is arranged between the first housing 1 and the second housing 19. The sealing gasket 20 is an annular structure designed along the outer contour of the first housing 1 and the second housing 19, which can seal the mating surfaces between the first housing 1 and the second housing 19 and prevent the oil-gas mixture in the engine housing from leaking from the mating gap between the first housing 1 and the second housing 19.

[0031] A cylinder (not shown in the figure) is connected to the cylinder block mating surface 2 of the first housing 1. The cylinder is located in the middle of the cylinder block mating surface 2. The first labyrinth separation chamber 3 is arranged on one side of the cylinder block mating surface 2 and at the front end of the engine. That is, the first labyrinth separation chamber 3 is located at the corner of the first housing 1. Since the first housing 1 mainly installs crankshafts and gears, and the middle of the first housing 1 is a circular cavity, the first labyrinth separation chamber 3 can make full use of the size of the corner of the first housing 1, so that the first labyrinth separation chamber 3 can be designed to be longer. At the same time, designing the first labyrinth separation chamber 3 at the corner can also improve the aesthetic effect of the engine housing.

[0032] The engine's front end is the right side (as shown in the diagram) of the first housing 1. The engine's front end is nearly perpendicular to the cylinder block mating surface 2. The first labyrinth separation chamber 3 includes an intake passage 4 and a splitting chamber 5. The intake passage 4 is located in the middle of the front end and is inclined along the inner wall of the first housing 1. An intake port 8 is located at the bottom of the intake passage 4, extending towards the bottom of the engine housing (lower position in the diagram), allowing the intake port 8 to be close to both the inner wall and the bottom of the first housing 1. The top of the intake passage 4 connects to the splitting chamber 5, and an outlet 9 is located at the top of the splitting chamber 5. After being heated and expanding, the oil-gas mixture inside the engine housing enters through the intake port 8 of the intake passage 4, then moves upwards along the intake passage 4 into the splitting chamber 5. After being split by the splitting chamber 5, most of the oil in the oil-gas mixture is separated, leaving mainly exhaust gas components, which are finally discharged from the engine housing through the outlet 8.

[0033] It should be noted that the first box body 1 includes a first axial end surface 6 and a second axial end surface 7, the first axial end surface 6 and the second axial end surface 7 are two axial end surfaces of the first box body 1, the air inlet 8 of the air inlet channel 4 is located on the side of the first axial end surface 6, the air outlet 9 is located on the side of the second axial end surface 7, the axial depth of the shunt cavity 5 and the air inlet channel 4 is adapted to the overall axial size of the first box body 1, so as to increase the volume of the first labyrinth separation cavity 3 as much as possible, improve the oil-gas mixture containing space, reduce the flow rate of the oil-gas mixture, increase the residence time of the oil-gas mixture in the first labyrinth separation cavity 3, and improve the oil-gas separation effect.

[0034] A first shunt plate 10 is arranged in the shunt cavity 5 and at the output end position of the air inlet channel 4, one end of the first shunt plate 10 is connected with the inner wall of the first box body 1, and the other end is spaced from the inner wall of the shunt cavity 5, so that when the oil-gas mixture is output from the air inlet channel 4, the first shunt plate 10 can guide the oil-gas mixture into the shunt cavity 5; a shunt port 11 is arranged at the connection position of the first shunt plate 10 and the first box body 1, the shunt port 11 is located on the side of the first axial end surface 6, and a first baffle protrusion 12 is further arranged on the first shunt plate 10, the first baffle protrusion 12 is located on the side of the shunt port 11. When the oil-gas mixture reaches the output end of the air inlet channel 4, part of the oil-gas mixture enters the inside of the shunt cavity 5 through the shunt port 11, and part of the oil-gas mixture enters the inlet of the shunt cavity 5 under the action of the first shunt plate 10. Among them, the first baffle protrusion 12 can block and guide the oil-gas mixture at the output end of the air inlet channel 4, guide the oil-gas mixture to the side of the shunt port 11, and also improve the collision effect of the oil-gas mixture and the baffle structure, and improve the oil-gas separation effect.

[0035] The second shunt plate 13 is integrally connected with the first tank 1 at one end, and is integrally connected with the first tank 1 at the other end. However, the second shunt plate 13 and the first tank 1 are provided with a gas vent 14 at the connection position. The gas vent 14 is arranged on the first axial end surface 6 of the first tank 1. The inner wall side of the first tank 1 protrudes towards the side of the shunt cavity 5 at the position of the first shunt plate 10. A narrow channel is formed on the side of the shunt cavity 5 close to the gas vent 14, thereby increasing the flow rate of the oil-gas mixture. It can be understood that in the present scheme, the gas inlet 8, the shunt port 11 and the gas vent 14 are all located on or close to the first axial end surface 7 of the first tank 1. Therefore, the overall diameter size of them is much smaller than the axial size of the first tank 1. When the oil-gas mixture flows through these gas ports, the flow rate of the oil-gas mixture is increased, thereby improving the separation effect of the oil-gas mixture. The axial size of the shunt cavity 5, the gas inlet channel 4 and other structures is close to the axial size of the first tank 1. In this way, the volume of the first labyrinth separation cavity 3 can be increased as much as possible, the flow rate of the oil-gas mixture in the shunt cavity 5 is slowed down, the oil-gas mixture stays for a longer time, and the attachment effect of the oil in the cavity is improved. A gas storage cavity 23 is formed between the partition plate 15 and the second shunt plate 13, which can accommodate a certain amount of oil-gas mixture, thereby increasing the volume of the shunt cavity 5 and prolonging the residence time of the oil-gas mixture.

[0036] The side of the second shunt plate 13 away from the partition plate 15 is an air outlet cavity 16. The air outlet cavity 16 is communicated with the shunt cavity 5 through the gas vent 14, that is, the oil-gas mixture in the shunt cavity 5 enters the air outlet cavity 16 through the gas vent 14. The gas outlet 9 is arranged in the air outlet cavity 16. A second baffle protrusion 17 is arranged in the air outlet cavity 16 and on the inner wall of the first tank 1. Specifically, the second baffle protrusion 17 is arranged on the inner wall where the cylinder matching surface 2 is located. One end of the second baffle protrusion 17 is connected with the inner wall of the first tank 1, and the other end of the second baffle protrusion 17 is separated from the second shunt plate 13. In this way, a buffer cavity 18 can be formed on the side of the second baffle 13 away from the gas outlet 9. In the engine tank, the oil-gas mixture flows intermittently in the form of pulses. The buffer cavity 18 not only can store the separated oil-gas mixture, but also can buffer the gas.

[0037] It should be further noted that in the present application, the discharge channel of the oil-gas mixture is also the return channel of the oil, that is, the separated oil in the distribution chamber 5, the gas outlet chamber 16 and the gas inlet channel 4 will return along the original path, and finally return to the engine box from the gas inlet 9 of the gas inlet channel 4. Therefore, the first distribution plate 10, the partition plate 15 and the second distribution plate 13 are arranged with a certain slope, specifically, the first distribution plate 10, the partition plate 15 and the second distribution plate 13 are arranged downwardly from the inner wall of the distribution chamber 5 to the inner wall of the first box 1.

[0038] A second labyrinth separation chamber 21 is arranged on the second box 19 and corresponds to the first labyrinth separation chamber 3 of the first box 1. The overall shape and structure of the second labyrinth separation chamber 21 are similar to those of the first labyrinth separation chamber 3, but the second labyrinth separation chamber 21 does not have a corresponding gas port structure. The gasket 20 has a gasket structure at the position corresponding to the first labyrinth separation chamber 3, which can separate the first labyrinth separation chamber 3 and the second labyrinth separation chamber 21. The gasket 20 further has a communication hole 22 communicating the first labyrinth separation chamber 3 and the second labyrinth separation chamber 21. The oil-gas mixture in the first labyrinth separation chamber 3 can enter the second labyrinth separation chamber 21 through the communication hole 22, thereby increasing the flow branch of the oil-gas mixture in the engine box and improving the oil-gas separation effect.

Claims

1. An engine block structure characterized by comprising: The first box body comprises a cylinder body matching surface, a first labyrinth separation cavity is arranged at one end of the cylinder body matching surface, the first labyrinth separation cavity comprises an air inlet channel and a flow separation cavity, an air inlet is arranged at the first axial end surface of the first box body away from the flow separation cavity side of the air inlet channel, and an air outlet is arranged at the second axial end surface of the first box body away from the air inlet channel side of the flow separation cavity.

2. An engine block structure according to claim 1, characterized in that A first flow separation plate is arranged in the flow separation cavity, one end of the first flow separation plate is connected with the inner wall of the first box body, and the other end is separated from the inner wall of the flow separation cavity.

3. An engine block structure according to claim 2, characterized in that A flow separation opening is arranged at the connection between the first flow separation plate and the first box body, and the flow separation opening is arranged at the first axial end surface of the first box body.

4. An engine block structure according to claim 3, characterized in that A first baffle protrusion is arranged on the first flow separation plate towards the air inlet channel side, and the first baffle protrusion is arranged close to the flow separation opening.

5. An engine block structure according to any one of claims 2 to 4, characterized in that A second flow separation plate is further arranged in the flow separation cavity, one end of the second flow separation plate is connected with the inner wall of the first box body and is arranged with an air passage, the air passage is arranged at the first axial end surface of the first box body, and the other end of the second flow separation plate is connected with the inner wall of the flow separation cavity.

6. An engine block structure according to claim 5, wherein A separation plate is arranged between the second flow separation plate and the first flow separation plate, one end of the separation plate is connected with the inner wall of the flow separation cavity, and the other end is separated from the inner wall of the first box body.

7. An engine block structure according to claim 6, wherein The air outlet is arranged on the side of the second flow separation plate away from the first flow separation plate, the air outlet is arranged close to the air passage, and the first flow separation plate, the second flow separation plate and the separation plate are all arranged obliquely downward from the inner wall of the flow separation cavity to the inner wall of the first box body.

8. An engine block structure according to claim 7, characterized in that The side of the second flow separation plate away from the first flow separation plate forms an air outlet cavity with the first box body, the air outlet is arranged in the air outlet cavity, a second baffle protrusion is arranged in the air outlet cavity and on the inner wall of the first box body, and the side of the second baffle protrusion away from the air outlet forms a buffer cavity.

9. An engine block structure according to any one of claims 1 to 4, characterized in that The air inlet channel is arranged on one side of the inner wall of the first box body, and the input end of the air inlet channel extends towards the bottom of the first box body.

10. An engine block structure according to claim 9, characterized by A second box body is further arranged to be matched with the first box body, a sealing gasket is arranged between the second box body and the first box body, a second labyrinth separation cavity is arranged on the second box body corresponding to the first labyrinth separation cavity, and a communication hole is arranged on the sealing gasket corresponding to the first labyrinth separation cavity.

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