Oil-gas separation device for motorcycle gearbox

Abstract

The present invention provides an oil-gas separation device for a motorcycle gearbox, and belongs to the technical field of motorcycles. It solves the problem of poor oil-gas separation effect in existing motorcycle gearboxes. The oil-gas separation device includes an oil-gas separation chamber, an air inlet, an air outlet, and a labyrinth separation structure arranged between the air inlet and the air outlet, which are arranged on the gearbox housing. The air inlet is used to connect the oil-gas separation chamber and the inner cavity of the gearbox. An oil-gas separation pipe is arranged at the air inlet. The oil-gas separation pipe extends to the top of the oil-gas separation chamber and the upper end port is closed. An oil-gas advance separation port is opened on the outer peripheral wall of the oil-gas separation pipe. The oil-gas separation chamber is connected to the inner cavity of the gearbox through the above-mentioned oil-gas advance separation port. Through the above-mentioned design, the mixed gas can be separated in advance before entering the oil-gas separation chamber, and then separated again by the labyrinth separation structure, thereby greatly improving the effect of oil-gas separation, thereby meeting the oil-gas separation requirements under the special environment of the above-mentioned transmission.

Description

Technical Field

[0001] The invention belongs to the technical field of motorcycles and relates to an oil-gas separation device of a motorcycle gearbox. Background Art

[0002] During the operation of a motorcycle engine, a small amount of incompletely burned gas will inevitably flow into the gearbox from the gap between the cylinder block and the piston ring. This blow-by gas is usually called piston blow-by. Since piston blow-by will cause the internal pressure of the gearbox to continue to rise, and piston blow-by itself contains harmful gases, in order to control the internal pressure of the gearbox and protect the environment, a gearbox forced ventilation system is generally designed to introduce the gas blown into the engine's air intake for secondary combustion, which avoids the pollution caused by the incompletely burned exhaust gas being discharged into the atmosphere, and can also play a role in energy conservation and environmental protection.

[0003] However, unfiltered piston blow-by contains engine oil, which will be brought into the engine along with the piston blow-by and burned. The long-term result is serious carbon deposits inside the engine, and a large amount of engine oil mixed into the engine will cause spark plug ignition failure and burn the throttle valve. For this reason, in the prior art, a labyrinth oil-gas separator is generally provided on the gearbox to separate the oil and gas of the above-mentioned piston blow-by, and the engine oil carried by the piston blow-by through the gearbox is then retained in the gearbox to prevent the engine oil from entering the engine and causing the above-mentioned adverse effects on the engine.

[0004] However, the separation effect of the existing labyrinth oil-gas separator is relatively poor. The reason is that, unlike the working environment of other gasoline engines, in the gearbox of a motorcycle, since the main shaft and the secondary shaft of the gearbox rotate at high speed, and considering the limitation of the installation space, the air inlet of the oil-gas separator is generally designed close to the high-speed rotating shaft of the gearbox, which causes the lubricating oil evaporated on the rotating shaft to mix with the piston blowby gas that enters the gearbox to form a mixed gas, which further increases the oil content of the mixed gas. In other words, higher requirements are put forward for the oil-gas separation of the mixed gas in the gearbox. The existing traditional labyrinth oil-gas separator can only be used in ordinary oil-gas separation environments, and does not have an absolute function of separating oil and gas. Moreover, the oil-gas separation structure of the labyrinth structure cannot reduce the formation of oil and gas before oil-gas separation. Therefore, its application in the gearbox environment has a poor oil-gas separation effect. In order to improve the oil-gas separation effect, the technical means generally adopted by those skilled in the art is to complicate the design of the partition arrangement in the labyrinth separation structure, so as to achieve the purpose of improving the oil-gas separation effect. Summary of the invention

[0005] The purpose of the present invention is to solve the above problems in the prior art and to propose an oil-gas separation device for a motorcycle gearbox. The present invention solves the problem of poor oil-gas separation effect in the prior motorcycle gearbox.

[0006] The object of the present invention can be achieved through the following technical solutions: an oil-gas separation device for a motorcycle gearbox, comprising an oil-gas separation chamber arranged on a gearbox housing, and also comprising an air inlet, an air outlet and a labyrinth separation structure arranged between the air inlet and the air outlet, wherein the air inlet is used to connect the oil-gas separation chamber and the inner cavity of the gearbox, and is characterized in that an oil-gas separation pipe is provided at the air inlet, the oil-gas separation pipe extends to the top of the oil-gas separation chamber and the upper end port is closed, an oil-gas early separation port is opened on the outer peripheral wall of the oil-gas separation pipe, and the oil-gas separation chamber is connected to the inner cavity of the gearbox through the above-mentioned oil-gas early separation port.

[0007] In view of the special application environment in which the air inlet for connecting the oil-gas separation chamber and the inner cavity of the gearbox is arranged on the box body above the shaft hole of the gearbox rotating shaft, different from the prior art, the oil-gas separation device of the motorcycle gearbox is based on the existing labyrinth separation structure, but does not complicate the design of the labyrinth separation structure, but designs an oil-gas separation pipe at the air inlet to isolate the air inlet and the oil-gas separation chamber, and the upper end of the oil-gas separation pipe extends to the top of the oil-gas separation chamber, so that the mixed gas does not directly enter the labyrinth separation structure between the air inlet and the air outlet for oil-gas separation, but can obtain an extended extension channel before entering the oil-gas separation chamber. At the same time, the oil-gas separation pipe is designed, that is, the upper end port of the oil-gas separation pipe is closed and an oil-gas advance separation port connecting the air inlet and the oil-gas separation chamber is opened on its outer peripheral wall, so that the mixed gas enters the oil When the gas separation tube rises and impacts the top of the closed port of the oil-gas separation tube, the mixed gas is blocked by the closed top. At this time, part of the oil will be separated from the gas here, that is, when the oil is still at the closed top, the gas has already flowed out from the oil-gas pre-separation port along the tube wall into the oil-gas separation chamber. In other words, the above structural design of the oil-gas separation tube brings a U-shaped maze path to the mixed gas, and combined with the above-mentioned extension design extending to the top, the mixed gas can undergo a better oil-gas separation before entering the oil-gas separation chamber; subsequently, when the mixed gas enters the labyrinth separation structure of the oil-gas separation chamber for oil-gas separation, it is the second oil-gas separation treatment; therefore, through the above-mentioned advance oil-gas separation design of the oil-gas separation tube, the device can perform double separation treatment on the mixed gas, greatly improving the effect of oil-gas separation, thereby meeting the oil-gas separation requirements of the above-mentioned transmission environment. In addition, the design of the above-mentioned oil-gas separation tube makes full use of the space in the oil-gas separation chamber, does not occupy additional installation space, and does not affect the modification of the existing oil-gas separation device.

[0008] In the oil-gas separation device of the above-mentioned motorcycle gearbox, the oil-gas separation tube is in the shape of a straight column and the top of the upper end has an oil-gas separation slope that is inclined from top to bottom toward the side where the oil-gas advance separation port is located. When the mixed gas enters the oil-gas separation tube and impacts the top of the oil-gas separation tube, the mixed gas is guided by the slope, so that the position of oil-gas separation is moved to the angle between the slope and the tube wall. Since the gas flow rate is fast and the weight is light, and the oil-gas separation slope is inclined from top to bottom toward the side where the oil-gas advance separation port is located, when the mixed gas is blocked and turned back, the oil-gas separation slope can quickly guide the separated gas to flow out of the oil-gas advance separation port, while the relatively slower and heavier separated oil will flow back to the gearbox along the tube wall on the side away from the oil-gas advance separation port. Therefore, through the above design, the separation path of oil and gas is clearly planned, reducing the situation of mixing after separation of the two, and greatly reducing the amount of oil carried by gas to the oil-gas advance separation port, thereby further improving the oil-gas separation effect.

[0009] In the above-mentioned oil-gas separation device of the motorcycle gearbox, the lower edge of the opening of the oil-gas advance separation port is connected to and flush with the bottom surface of the oil-gas separation chamber, or the lower edge of the opening of the oil-gas advance separation port is part of the bottom surface of the oil-gas separation chamber. Through the above design, the mixed gas can contact the bottom surface of the oil-gas separation chamber as soon as it flows out of the oil-gas advance separation port, which is conducive to increasing the contact area and contact time between the mixed gas and the oil-gas separation chamber, thereby helping to improve the oil-gas separation effect.

[0010] In the above-mentioned oil-gas separation device of the motorcycle gearbox, the lower end of the oil-gas separation tube extends downward out of the air inlet. Through the above design, the oil-gas separation tube extending out of the air inlet into the gearbox can form an oil-gas separation structure around the air inlet inside the gearbox, that is, before the mixed gas enters the air inlet, it will be blocked by the lower end of the oil-gas separation tube, so that the mixed gas can be separated from the oil and gas here, thereby further improving the oil-gas separation effect of the device.

[0011] In the above-mentioned oil-gas separation device of the motorcycle gearbox, the cross section of the air inlet is circular, and the vertical opening width of the oil-gas advance separation port is smaller than the diameter of the air inlet. By designing the oil-gas advance separation port to be smaller, the oil-gas advance separation port can form a filtering effect similar to a filter hole, which is beneficial to improving the oil-gas separation pipe's advance separation effect on the mixed gas.

[0012] In the above-mentioned oil-gas separation device of the motorcycle gearbox, the angle between the oil-gas separation inclined surface and the air inlet cross section is 30° to 60°. By rationally designing the above-mentioned inclined angle, the oil-gas separation effect of the oil-gas separation tube can be improved. The above-mentioned angle is preferably 45°.

[0013] In the oil-gas separation device of the above motorcycle gearbox, the outer peripheral wall of the oil-gas separation tube is provided with a connecting plate, and the oil-gas separation tube passes through the air inlet and is fixed to the bottom surface of the oil-gas separation chamber or to the inner surface of the gearbox housing through the connecting plate. The above split design is conducive to the modification design of the existing oil-gas separation device; as another equivalent solution, the oil-gas separation tube can also be integrally formed with the gearbox housing, and finally the fixing design of the oil-gas separation tube and the air inlet can be realized.

[0014] In the oil-gas separation device of the above motorcycle gearbox, the oil-gas separation chamber is a rectangular chamber, the air inlet is located on the bottom surface of one end of the oil-gas separation chamber in the length direction, the air outlet is located on the top surface of the other end of the oil-gas separation chamber in the length direction, and the bottom surface of the oil-gas separation chamber has a separation slope inclined from high to low along the length direction of the oil-gas separation chamber, and the low point of the separation slope is close to the air inlet. By designing the positions of the air inlet and the air outlet, and the separation slope, the mixed gas can be blocked by the separation slope in the process of entering the oil-gas separation chamber and flowing to the air outlet, thereby slowing down the flow rate of the mixed gas, and prolonging the residence time of the mixed gas in the oil-gas separation chamber, so that the mixed gas can fully benefit from the labyrinth separation structure in the oil-gas separation chamber, thereby further improving the oil-gas separation effect of the device.

[0015] In the oil-gas separation device of the above-mentioned motorcycle gearbox, the labyrinth separation structure includes a separation baffle plate 1 located in the oil-gas separation chamber, one end of the separation baffle plate 1 is located on the side wall of the oil-gas separation chamber and extends from the side wall to the opposite side wall and forms a first separation port with the opposite side wall, the separation baffle plate 1 divides the oil-gas separation chamber into a separation chamber 1 and a separation chamber 2, the air inlet is located on the bottom surface of the end of the separation chamber 1 away from the first separation port; the air outlet is located on the top surface of the separation chamber 2 and is arranged diagonally with the first separation port, and the bottom surface of the separation chamber 2 is a separation slope. Based on the structure of the labyrinth separation baffle plate 1, by reasonably designing the arrangement positions of the above air inlet, air outlet and separation slope, it is ensured that the mixed gas can be blocked by the separation slope in the process of entering the oil-gas separation chamber and flowing to the air outlet, thereby slowing down the flow rate of the mixed gas and prolonging the residence time of the mixed gas in the oil-gas separation chamber, so that the mixed gas can be fully affected by the labyrinth separation structure in the oil-gas separation chamber, thereby further improving the oil-gas separation effect of the device.

[0016] In the oil-gas separation device of the above motorcycle gearbox, the opening of the oil-gas advance separation port faces the side wall of the separation chamber one close to the first separation port, and the bottom surface of the corner of the separation chamber one close to the first separation port has a downwardly sunken oil return pit one, and the oil return pit one has an oil return hole one connecting the oil-gas separation chamber and the gearbox inner cavity. Through the above oil-gas separation port opening direction design, the mixed gas can enter along the air intake path of the labyrinth separation structure, thereby achieving oil-gas separation, and through the above corner position oil return hole design, the separated oil can flow back to the gearbox to avoid it from mixing with the mixed gas again, which is beneficial to improve the oil-gas separation effect of the device.

[0017] In the oil-gas separation device of the above-mentioned motorcycle gearbox, the labyrinth separation structure also includes a V-shaped separation baffle plate 2 located in the separation chamber 2, the separation baffle plate 2 is arranged between the first separation port and the air outlet, and the V-shaped tip faces the first separation port, one end of the separation baffle plate 2 is located on the cavity wall of the separation chamber 2 on the opposite side of the first separation port, and a second separation port is formed between the other end of the separation baffle plate 2 and the separation baffle plate 1, the separation baffle plate 2 divides the separation chamber 2 into a small separation chamber 1 and a small separation chamber 2, the first separation port connects the separation chamber 1 and the small separation chamber 1, the second separation port connects the small separation chamber 1 and the small separation chamber 2, and the air outlet is located on the top surface of the small separation chamber 2. Through the above design of the air outlet position, it can be ensured that the mixed gas flowing out of the oil-gas separation tube is re-separated by the labyrinth separation structure after the pre-separation treatment of the oil-gas separation tube, that is, the mixed gas is re-separated when passing through the separation chamber 1, the first separation port, the small separation chamber 1 and the small separation chamber 2; thereby ensuring the improvement of the oil-gas separation effect of the device.

[0018] In the oil-gas separation device of the motorcycle gearbox, the bottom surface of the corner formed by the separation partition plate 1 and the wall of the separation chamber 2 has a downwardly sunken oil return pit 2, the oil return pit 2 is close to the second separation port, and the oil return pit 2 has an oil return hole 2 connecting the oil-gas separation chamber and the gearbox inner cavity. Through the above design, combined with the design of the separation slope, the oil separated by the separation chamber 2 can flow back to the gearbox to avoid remixing with the mixed gas, which is conducive to improving the oil-gas separation effect of the device.

[0019] As an alternative, the above-mentioned labyrinth separation structure may adopt the internal labyrinth structure of the oil-gas separator in patent document CN2729326Y.

[0020] Compared with the prior art, the oil-gas separation device of the motorcycle gearbox has the following advantages:

[0021] 1. The oil-gas separation device designs an oil-gas separation pipe structure at the air inlet so that the mixed gas can be separated in advance before entering the oil-gas separation chamber, and then separated again through the labyrinth separation structure, thereby greatly improving the oil-gas separation effect, thereby meeting the oil-gas separation requirements under the special environment of the above-mentioned transmission.

[0022] 2. The design of the oil-gas separation pipe in the device fully utilizes the space in the oil-gas separation chamber, does not occupy additional installation space, does not affect the modification of the existing oil-gas separation device, has a simple structure, and is easy to modify. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the structure of the oil and gas separation cover of the oil and gas separation device after explosion.

[0024] Figure 2 It is a schematic diagram of the structure of the oil-gas separation device after the oil-gas separation cover is hidden.

[0025] Figure 3 It is a schematic diagram of the structure of the oil and gas separation pipe of the oil and gas separation device after the explosion.

[0026] Figure 4 It is a schematic diagram of the cross-sectional structure of the oil-gas separation pipe in the oil-gas separation device cut along the horizontal direction.

[0027] Figure 5 It is a structural schematic diagram of the oil-gas separation tube in the oil-gas separation device.

[0028] In the figure, a, gearbox; a1, rotating shaft hole; 1, oil-gas separation chamber; 1a, separation chamber one; 1b, separation chamber two; 1b1, small separation chamber one; 1b2, small separation chamber two; 2, air inlet; 3, air outlet; 4, oil-gas separation pipe; 41, oil-gas advance separation port; 42, connecting plate; 4a, oil-gas separation slope; 5, separation slope; 6, separation partition one; 7, first separation port; 8, return oil pit one; 9, return oil hole one; 10, separation partition two; 11, second separation port; 12, return oil pit two; 13, return oil hole two; 14, oil-gas separation cover. DETAILED DESCRIPTION

[0029] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0030] Specifically, if Figure 1As shown, the oil-gas separation device of the motorcycle gearbox includes an oil-gas separation chamber 1, an air inlet 2, an air outlet 3, and a labyrinth separation structure arranged on the gearbox a housing. Among them, an oil-gas separation cover 14 is fixedly connected to the housing of the gearbox a, and the shell of the device is composed of the housing of the gearbox a and the oil-gas separation cover 14. The oil-gas separation chamber 1 is formed by the oil-gas separation cover 14 and the housing of the gearbox a. The air inlet 2 is used to connect the oil-gas separation chamber 1 and the inner cavity of the gearbox a and is arranged on the housing above the rotating shaft hole a1 of the gearbox a. A straight columnar oil-gas separation pipe 4 is provided at the air inlet 2. The upper end of the oil-gas separation pipe 4 extends to the top of the oil-gas separation chamber 1 and isolates the air inlet 2 from the oil-gas separation chamber 1. The upper end port of the oil-gas separation pipe 4 is closed and an oil-gas advance separation port 41 connecting the air inlet 2 and the oil-gas separation chamber 1 is opened on the outer peripheral wall. At the same time, as Figure 3 As shown, the top of the upper end of the oil-gas separation tube 4 has an oil-gas separation slope 4a that is inclined from top to bottom toward the side where the oil-gas advance separation port 41 is located. The angle between the oil-gas separation slope 4a and the cross section of the air inlet 2 is 30° to 60°, preferably 45°. The lower edge of the opening of the oil-gas advance separation port 41 is connected to the bottom surface of the oil-gas separation chamber 1 or the lower edge of the opening of the oil-gas advance separation port 41 is part of the bottom surface of the oil-gas separation chamber 1. The cross section of the air inlet 2 is circular, and the vertical opening width of the oil-gas advance separation port 41 is smaller than the diameter of the air inlet 2. The lower end of the oil-gas separation tube 4 extends downward out of the air inlet 2.

[0031] More specifically, if Figure 1 and Figure 2 As shown, in this embodiment, the oil-gas separation chamber 1 is a rectangular chamber, the air inlet 2 is located on the bottom surface of one end of the oil-gas separation chamber 1 in the length direction, and the air outlet 3 is located on the top surface of the other end of the oil-gas separation chamber 1 in the length direction. The bottom surface of the oil-gas separation chamber 1 has a separation slope 5 that is inclined from high to low along the length direction of the oil-gas separation chamber 1, and the low point of the separation slope 5 is close to the air inlet 2. Figure 2As shown, the labyrinth separation structure of this embodiment includes a separation baffle 16 located in the oil-gas separation chamber 1, one end of the separation baffle 16 is located on the side wall of the oil-gas separation chamber 1 and extends from the side wall to the opposite side wall to form a first separation port 7 with the opposite side wall, the separation baffle 16 divides the oil-gas separation chamber 1 into a separation chamber 1a and a separation chamber 2 1b, the air inlet 2 is located on the bottom surface of the end of the separation chamber 1a away from the first separation port 7; the air outlet 3 is located on the top surface of the separation chamber 2 1b and is arranged diagonally with the first separation port 7, and the bottom surface of the separation chamber 2 1b is a separation slope 5. The opening of the oil-gas advance separation port 41 faces the side wall of the separation chamber 1a close to the first separation port 7, and the bottom surface of the corner of the end of the separation chamber 1a close to the first separation port 7 is provided with a downwardly concave oil return pit 18, and the oil return pit 8 is provided with an oil return hole 19 connecting the oil-gas separation chamber 1 and the inner cavity of the gearbox a. The labyrinth separation structure also includes a V-shaped separation partition 10 located in the separation chamber 1b. The separation partition 10 is arranged between the first separation port 7 and the air outlet 3 with the tip of the V facing the first separation port 7. One end of the separation partition 10 is located on the cavity wall of the separation chamber 1b on the opposite side of the first separation port 7. A second separation port 11 is formed between the other end of the separation partition 10 and the separation partition 16. The separation partition 10 divides the separation chamber 1b into a small separation chamber 1b1 and a small separation chamber 1b2. The first separation port 7 connects the separation chamber 1a and the small separation chamber 1b1. The second separation port 11 connects the small separation chamber 1b1 and the small separation chamber 1b2. The air outlet 3 is located on the top surface of the small separation chamber 1b2. The bottom surface of the corner formed by the separation partition 16 and the wall of the separation chamber 2 1b near the second separation port 11 has a downwardly recessed oil return pit 2 12, and the oil return pit 2 12 has an oil return hole 2 13 connecting the oil-gas separation chamber 1 and the inner cavity of the gearbox a.

[0032] In addition, in this embodiment, a connecting plate 42 is provided on the outer peripheral wall of the oil-gas separation tube 4, and the oil-gas separation tube 4 passes through the air inlet 2 and is fixed to the bottom surface of the oil-gas separation chamber 1 or to the inner surface of the transmission case a through the connecting plate 42. As a preferred solution, the connecting plate 42 of this embodiment is fixed to the bottom surface of the oil-gas separation chamber 1, and the connecting plate 42 extends toward the oil return pit 8 and connects the oil-gas advance separation port 41. At this time, the connecting plate 42 can guide the oil separated from the mixed gas to the oil return pit 8, reducing the separated oil from mixing with the gas again, which can further improve the oil-gas separation effect.

[0033] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0034] Although the present invention uses more terms such as gearbox a, rotating shaft hole a1, oil-gas separation chamber 1, separation chamber 1a, separation chamber 2 1b, small separation chamber 1b1, small separation chamber 2 1b2, air inlet 2, air outlet 3, oil-gas separation pipe 4, oil-gas advance separation port 41, connecting plate 42, oil-gas separation slope 4a, separation slope 5, separation partition 1 6, first separation port 7, oil return pit 1 8, oil return hole 1 9, separation partition 2 10, second separation port 11, oil return pit 2 12, oil return hole 2 13, oil-gas separation cover 14, etc., it does not exclude the possibility of using other terms. These terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional restrictions is contrary to the spirit of the present invention.

Claims

1. An oil-gas separation device for a motorcycle gearbox, comprising an oil-gas separation chamber (1) arranged on a gearbox (a) housing, and further comprising an air inlet (2), an air outlet (3) and a labyrinth separation structure arranged between the air inlet (2) and the air outlet (3), wherein the air inlet (2) is used to connect the oil-gas separation chamber (1) and the inner cavity of the gearbox (a), and characterized in that: An oil-gas separation pipe (4) is provided at the air inlet (2), the upper end of the oil-gas separation pipe (4) extends toward the top of the oil-gas separation chamber (1) and the upper end port is closed, an oil-gas early separation port (41) is provided on the outer peripheral wall of the oil-gas separation pipe (4), and the oil-gas separation chamber (1) is connected to the inner cavity of the gearbox (a) through the above-mentioned oil-gas early separation port (41).

2. The oil-gas separation device of a motorcycle gearbox according to claim 1, characterized in that: The oil-gas separation pipe (4) is in the shape of a straight column and has an oil-gas separation inclined surface (4a) at the top of the upper end thereof, which is inclined from top to bottom toward the side where the oil-gas advance separation port (41) is located.

3. The oil-gas separation device of a motorcycle gearbox according to claim 1, characterized in that: The lower edge of the opening of the oil-gas early separation port (41) is connected to the bottom surface of the oil-gas separation chamber (1), or the lower edge of the opening of the oil-gas early separation port (41) is part of the bottom surface of the oil-gas separation chamber (1).

4. The oil-gas separation device for a motorcycle gearbox according to claim 1, 2 or 3, characterized in that: The lower end of the oil-gas separation pipe (4) extends downwardly out of the air inlet (2).

5. The oil-gas separation device for a motorcycle gearbox according to claim 1, 2 or 3, characterized in that: The cross section of the air inlet (2) is circular, and the vertical opening width of the oil-gas early separation port (41) is smaller than the diameter of the air inlet (2).

6. The oil-gas separation device for a motorcycle gearbox according to claim 1, 2 or 3, characterized in that: The oil-gas separation chamber (1) is a rectangular chamber, the air inlet (2) is located on the bottom surface of one end of the oil-gas separation chamber (1) in the longitudinal direction, the air outlet (3) is located on the top surface of the other end of the oil-gas separation chamber (1) in the longitudinal direction, and the bottom surface of the oil-gas separation chamber (1) has a separation slope (5) inclined from high to low along the longitudinal direction of the oil-gas separation chamber (1), and the low point of the separation slope (5) is close to the air inlet (2).

7. The oil-gas separation device for a motorcycle gearbox according to claim 6, characterized in that: The labyrinth separation structure comprises a separation baffle plate 1 (6) located in the oil-gas separation chamber (1); one end of the separation baffle plate 1 (6) is located on the side wall of the oil-gas separation chamber (1) and extends from the side wall to the opposite side wall to form a first separation opening (7) with the opposite side wall; the separation baffle plate 1 (6) divides the oil-gas separation chamber (1) into a separation chamber 1 (1a) and a separation chamber 2 (1b); the air inlet (2) is located on the bottom surface of the separation chamber 1 (1a) at one end away from the first separation opening (7); the air outlet (3) is located on the top surface of the separation chamber 2 (1b) and is arranged diagonally with the first separation opening (7); the bottom surface of the separation chamber 2 (1b) is a separation slope surface (5).

8. The oil-gas separation device for a motorcycle gearbox according to claim 7, characterized in that: The opening of the oil-gas advance separation port (41) faces the side wall of the separation chamber (1a) at one end close to the first separation port (7); the separation chamber (1a) has a downwardly recessed oil return pit (8) on the bottom surface of the corner at one end close to the first separation port (7); the oil return pit (8) has an oil return hole (9) communicating with the oil-gas separation chamber (1) and the inner cavity of the gearbox (a).

9. The oil-gas separation device for a motorcycle gearbox according to claim 8, characterized in that: The labyrinth separation structure further comprises a V-shaped separation baffle plate 2 (10) located in the second separation chamber (1b); the second separation baffle plate (10) is arranged between the first separation port (7) and the air outlet (3) with the tip of the V facing the first separation port (7); one end of the second separation baffle plate (10) is located on the chamber wall of the second separation chamber (1b) on the opposite side of the first separation port (7); a second separation port (11) is formed between the other end of the second separation baffle plate (10) and the first separation baffle plate (6); the second separation baffle plate (10) divides the second separation chamber (1b) into a small separation chamber (1b1) and a small separation chamber (1b2); the first separation port (7) connects the first separation chamber (1a) and the small separation chamber (1b1); the second separation port (11) connects the small separation chamber (1b1) and the small separation chamber (1b2); and the air outlet (3) is located on the top surface of the small separation chamber (1b2).

10. The oil-gas separation device of a motorcycle gearbox according to claim 9, characterized in that: The bottom surface of the corner formed by the separation partition plate 1 (6) and the wall of the separation chamber 2 (1b) is provided with a downwardly recessed oil return pit 2 (12), the oil return pit 2 (12) being close to the second separation port (11), and the oil return pit 2 (12) is provided with an oil return hole 2 (13) communicating with the oil-gas separation chamber (1) and the inner cavity of the gearbox (a).

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