Oil-gas separation device of motorcycle gearbox

Abstract

The utility model discloses a kind of oil-gas separation devices of motorcycle gearbox, including box and the partition placed in box, oil-gas separation cavity is equipped on the partition between driving pulley and forward clutch, oil-gas separation cavity is connected with the chamber of the box inside installation forward clutch by air inlet, oil-gas separation cavity is connected with the outside of box by air outlet, oil-gas separation cavity is equipped with the labyrinth separation structure between air inlet and air outlet. Oil-gas separation cavity structure is compact, will not cause the partial size increase of gearbox assembly to thereby interfere with the arrangement of the peripheral pipeline and other components of gearbox;Oil-gas separation cavity is arranged on the partition in gearbox, without changing the external structure of gearbox assembly, prevent local encroachment in the compact space of engine compartment;Oil-gas separation cavity structure is simple, reasonably utilizes gearbox internal space.

Description

Technical Field

[0001] This utility model relates to the field of motorcycle gearbox technology, and in particular to an oil-gas separation device for a motorcycle gearbox. Background Technology

[0002] During motorcycle engine operation, a small portion of unburned gases inevitably seeps into the transmission through the gap between the cylinder block and piston rings; this is commonly referred to as blow-by gas. Because blow-by gas causes a continuous increase in internal transmission pressure and contains harmful gases, a forced ventilation system is typically designed to guide the blow-by gas into the engine intake for secondary combustion, in order to control internal transmission pressure and protect the environment. However, unfiltered blow-by gas contains engine oil, which is carried into the engine for combustion. Over time, this results in severe carbon buildup inside the engine, and the large amount of oil mixed in can cause spark plug failure and burn out the throttle body. Therefore, current technology incorporates a labyrinthine oil separator in the motorcycle transmission to separate the blow-by gas from the oil, trapping the oil carried by the blow-by gas back into the transmission and preventing it from entering the engine and causing the aforementioned adverse effects. The existing labyrinth-type oil-gas separator is located on the outer wall of the transmission housing, which directly increases the local size of the transmission assembly. Its protruding structure will encroach on the already compact lateral or longitudinal space in the engine compartment, and may interfere with the layout of surrounding pipelines and other components.

[0003] For example, Chinese Patent Publication No. CN111156067A, published on May 15, 2020, entitled "An Oil-Gas Separation Device for a Motorcycle Gearbox", includes an oil-gas separation chamber, an air inlet, an air outlet, and a labyrinthine separation structure disposed between the air inlet and the air outlet, all located on the gearbox housing. The air inlet is used to connect the oil-gas separation chamber and the gearbox cavity. 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 its upper end is closed. An oil-gas pre-separation port is provided on the outer peripheral wall of the oil-gas separation pipe. The oil-gas separation chamber is connected to the gearbox cavity through the aforementioned oil-gas pre-separation port.

[0004] The drawback of the existing patent is that the oil-gas separator of the existing motorcycle gearbox is protruding on the outer wall of the gearbox, which directly increases the local size of the gearbox assembly. Its protruding structure will encroach on the already compact horizontal or vertical space in the engine compartment, which may interfere with the layout of surrounding pipelines and other components. Utility Model Content

[0005] The purpose of this invention is to improve the problem that the oil-gas separator of the existing motorcycle gearbox is protruding on the outer wall of the gearbox, which causes an increase in the local size of the gearbox assembly, and to provide a compact oil-gas separator for the motorcycle gearbox.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: An oil-gas separator for a motorcycle gearbox includes a housing and a partition inside the housing. The partition has an oil-gas separation chamber located between the drive pulley and the forward clutch. The oil-gas separation chamber is connected to the chamber where the forward clutch is installed inside the housing via an air inlet, and to the outside of the housing via an air outlet. A labyrinthine separation structure is located within the oil-gas separation chamber between the air inlet and outlet. This technical solution provides an oil-gas separator with the separation chamber positioned on the partition of the housing between the drive pulley and the forward clutch. Compared to existing technologies where the oil-gas separator protrudes from the outer wall of the gearbox, increasing the local size of the gearbox assembly, this technical solution features a compact oil-gas separation chamber structure that avoids increasing the local size of the gearbox assembly and thus interfering with the arrangement of peripheral pipelines and other components. The oil-gas separation chamber is located on the partition inside the gearbox, without altering the external structure of the gearbox assembly, preventing partial encroachment on the compact space within the engine compartment, allowing the gearbox to remain compactly arranged within the engine compartment.

[0007] Preferably, the oil-gas separation chamber is provided with an oil return groove, and an oil drain port is provided at the upper part of the oil return groove. The oil drain port connects the oil return groove and the chamber in the housing where the forward clutch is installed. Piston blow-by gas containing accumulated oil enters the oil-gas separation chamber through the air inlet. Oil-gas separation is achieved by the labyrinth-type separation structure. The separated gas is discharged from the air outlet, and the separated oil accumulates in the oil return groove and is discharged from the oil drain port. The oil drain port is located at the upper part of the oil return groove to ensure smooth oil discharge.

[0008] Preferably, the oil-gas separation chamber includes an oil-gas separation groove placed on a partition and a cover plate placed on the oil-gas separation groove. The structure of the oil-gas separation chamber is relatively simple. The oil-gas separation groove is integrally formed on the partition, the cover plate is placed on the oil-gas separation groove and forms an oil-gas separation chamber with the oil-gas separation groove, and the labyrinth-type separation structure is arranged inside the oil-gas separation groove.

[0009] Preferably, the cover plate is locked and fixed to the oil-gas separator by a locking device. The outer edge of the oil-gas separator opening is provided with a threaded hole, and the cover plate is threadedly locked to the oil-gas separator by the locking device.

[0010] Preferably, the depth of the oil return tank is greater than the depth of the oil-gas separation tank. The oil return tank is used to accumulate oil, and the oil separated in the oil-gas separation chamber is discharged from the oil outlet of the oil return tank after accumulation.

[0011] Preferably, the opening of the oil-gas separation groove faces the drive pulley, and the cover plate is located in the chamber where the drive pulley is installed within the gearbox. The drive pulley includes a fixed cone disc and a movable cone disc. The oil-gas separation chamber is located on the side facing the drive pulley, and the cover plate is close to the fixed cone disc. The fixed cone disc does not affect the cover plate. The space between the fixed cone disc and the partition plate is used to make the oil-gas separation chamber compactly arranged within the gearbox.

[0012] Preferably, the partition plate has a mounting hole for mounting the drive shaft between the drive pulley and the forward clutch. The oil-gas separation chamber extends along the outer peripheral wall of the mounting hole and is arranged in a circuitous manner. The air inlet is located at the first end of the oil-gas separation chamber, the air outlet is located at the tail end of the oil-gas separation chamber, and the oil outlet is located at the circuitous part of the oil-gas separation chamber. The gearbox contains a drive shaft and a drive pulley and a forward clutch mounted on the drive shaft. The drive shaft is mounted on the partition plate, and the drive pulley and the forward clutch are respectively located on both sides of the partition plate. This structure is a conventional technology. In this technical solution, the oil-gas separation chamber is located between the drive pulley and the forward clutch, and the oil-gas separation chamber extends along the outer peripheral wall of the mounting hole and is arranged in a circuitous manner. This makes reasonable use of the external structure of the mounting hole on the partition plate, and by extending along the outer peripheral wall of the mounting hole and being arranged in a circuitous manner, the total length of the oil-gas separation stroke is increased, thereby increasing the oil-gas separation effect. Meanwhile, the air inlet is located at the beginning of the oil-gas separation chamber, the air outlet is located at the end of the oil-gas separation chamber, and the oil outlet is located at the detour of the oil-gas separation chamber. The oil outlet is set at a distance from the exhaust port to prevent a large amount of air from entering the oil outlet and being directly discharged.

[0013] Preferably, the oil-gas separation chamber includes a first separation chamber and a second separation chamber extending along the outer peripheral wall of the mounting hole, and a connecting chamber connecting the first separation chamber and the second separation chamber. The first separation chamber is located between the second separation chamber and the mounting hole, and the oil outlet is located in the connecting chamber.

[0014] Preferably, the labyrinth-type separation structure includes a separation partition placed inside the oil-gas separation chamber. The separation partition is fixed to the inner wall of the oil-gas separation chamber and forms a separation port between the inner wall of the oil-gas separation chamber and the separation partition divides the oil-gas separation chamber into several separation chambers arranged along the length of the oil-gas separation chamber.

[0015] Preferably, the housing includes a central shell and covers and an oil pan located at both ends of the central shell. The partition divides the central shell into an upper chamber for mounting the drive pulley and a lower chamber for mounting the forward clutch. The oil discharged from the drain port is directly discharged into the oil pan.

[0016] Therefore, the present invention has the following beneficial effects: (1) The oil-gas separation chamber has a compact structure and will not cause an increase in the local size of the gearbox assembly, thereby interfering with the arrangement of the surrounding pipelines and other components of the gearbox; (2) The oil-gas separation chamber is set on the partition inside the gearbox, without changing the external structure of the gearbox assembly, and preventing local encroachment on the compact space inside the engine compartment; (3) The oil-gas separation chamber has a simple structure and makes reasonable use of the internal space of the gearbox. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the central shell in this utility model.

[0018] Figure 2 This is a schematic diagram of a structure of the central shell with a cover plate in this utility model.

[0019] Figure 3 This is a schematic diagram of a structure of this utility model with the cover removed.

[0020] Figure 4 This is a cross-sectional view of the present invention with the cover removed.

[0021] As shown in the picture: 1. Housing, 1.1. Partition, 1.1.1.1.2. Middle housing, 1.3. Oil pan. Oil-gas separation chamber 2, first separation chamber 2.1, second separation chamber 2.2, connecting chamber 2.3. Oil-gas separator 3, oil return tank 3.1 4. Cover plate; 5. Air inlet; 6. Air outlet; 7. Oil drain port. Separation partition 8, separation port 8.1 Upper chamber 9, lower chamber 10. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the utility model will be further described below in conjunction with the accompanying drawings and specific implementation methods.

[0023] Example 1, as Figure 1 , Figure 2 , Figure 3 , Figure 4 The illustrated oil-gas separation device for a motorcycle gearbox includes a housing 1 and a partition 1.1 placed inside the housing 1. The partition 1.1 is provided with an oil-gas separation chamber 2 located between the drive pulley and the forward clutch. The oil-gas separation chamber 2 is connected to the chamber inside the housing 1 where the forward clutch is installed through an air inlet 5. The oil-gas separation chamber 2 is connected to the outside of the housing 1 through an air outlet 6. The oil-gas separation chamber 2 is provided with a labyrinth-type separation structure placed between the air inlet 5 and the air outlet 6.

[0024] During motorcycle engine operation, a small portion of unburned gases inevitably seeps into the transmission through the gap between the cylinder block and piston rings; this is commonly referred to as blow-by gas. Because blow-by gas causes a continuous increase in internal transmission pressure and contains harmful gases, a forced ventilation system is typically designed to guide the blow-by gas into the engine's intake port 5 for secondary combustion, in order to control internal transmission pressure and protect the environment. However, unfiltered blow-by gas contains engine oil, which is carried into the engine for combustion. Over time, this results in severe carbon buildup inside the engine, and the large amount of oil mixed in can cause spark plug ignition failure and burn out the throttle body. Therefore, existing technology incorporates a labyrinthine oil separator in the motorcycle transmission to separate the blow-by gas from the oil, trapping the oil carried by the blow-by gas back into the transmission and preventing it from entering the engine and causing the aforementioned adverse effects. Existing labyrinth-type oil-gas separators are located on the outer wall of the gearbox housing 1, directly increasing the local dimensions of the gearbox assembly. Their protruding structure encroaches on the already compact lateral or longitudinal space within the engine compartment, potentially interfering with the arrangement of surrounding pipelines and other components. To address the problem of increased local dimensions caused by the protruding oil-gas separator on the outer wall of the existing motorcycle gearbox, a compact oil-gas separation device for a motorcycle gearbox is provided.

[0025] The above embodiment of a motorcycle gearbox oil-gas separation device places the oil-gas separation chamber 2 on the partition 1.1 of the housing 1, and positions the oil-gas separation chamber 2 between the drive pulley and the forward clutch. Compared to the prior art where the oil-gas separation device protrudes from the outer wall of the gearbox, causing an increase in the local size of the gearbox assembly, the oil-gas separation chamber 2 in this technical solution has a compact structure and will not cause an increase in the local size of the gearbox assembly, thereby interfering with the arrangement of the gearbox's peripheral pipelines and other components. The oil-gas separation chamber 2 is placed on the partition 1.1 inside the gearbox, without changing the external structure of the gearbox assembly, preventing partial encroachment on the compact space inside the engine compartment, so that the gearbox can still be compactly arranged inside the engine compartment.

[0026] Example 2, as Figure 1 , Figure 2 , Figure 3 , Figure 4The illustrated oil-gas separation device for a motorcycle gearbox includes a housing 1 and a partition 1.1 placed inside the housing 1. The partition 1.1 is provided with an oil-gas separation chamber 2 located between the drive pulley and the forward clutch. The oil-gas separation chamber 2 is connected to the chamber inside the housing 1 where the forward clutch is installed through an air inlet 5. The oil-gas separation chamber 2 is connected to the outside of the housing 1 through an air outlet 6. The oil-gas separation chamber 2 is provided with a labyrinth-type separation structure placed between the air inlet 5 and the air outlet 6.

[0027] In this embodiment, as Figure 1 As shown, the oil-gas separation chamber 2 is equipped with an oil return groove 3.1, and an oil drain port 7 is located at the top of the oil return groove 3.1. The oil drain port 7 connects the oil return groove 3.1 and the chamber in the housing 1 where the forward clutch is installed. Piston blow-by gas containing accumulated oil enters the oil-gas separation chamber 2 through the air inlet 5. Under the action of the labyrinth-type separation structure, oil-gas separation is achieved. The separated gas is discharged through the air outlet 6, and the separated oil accumulates in the oil return groove 3.1 and is discharged through the oil drain port 7. The oil drain port 7 is located at the top of the oil return groove 3.1 to ensure smooth oil discharge.

[0028] Further optimization of oil-gas separation chamber 2, such as... Figure 2 , Figure 4 As shown, the oil-gas separation chamber 2 includes an oil-gas separation tank 3 placed on a partition 1.1 and a cover plate 4 placed on the oil-gas separation tank 3. The structure of the oil-gas separation chamber 2 is relatively simple. The oil-gas separation tank 3 is integrally formed on the partition 1.1, and the cover plate 4 is placed on the oil-gas separation tank 3 to form the oil-gas separation chamber 2 together with the oil-gas separation tank 3. A labyrinth-type separation structure is set inside the oil-gas separation tank 3.

[0029] The cover plate 4 is further optimized and is locked and fixed to the oil-gas separation tank 3 by a locking device. The outer edge of the oil-gas separation tank 3 is provided with a threaded hole, and the cover plate 4 is locked to the oil-gas separation tank 3 by the locking device.

[0030] The oil return tank 3.1 is further optimized, with its depth exceeding that of the oil-gas separation tank 3. The oil return tank 3.1 is used to collect oil, and the oil separated in the oil-gas separation chamber 2 is discharged from the oil outlet 7 of the oil return tank 3.1 after accumulation.

[0031] The oil-gas separator 3 is further optimized, with its opening facing the drive pulley. The cover plate 4 is located in the chamber where the drive pulley is installed within the housing 1. The drive pulley includes a fixed cone disc and a movable cone disc. The oil-gas separator 2 is located on the side facing the drive pulley, and the cover plate 4 is close to the fixed cone disc. The fixed cone disc does not affect the cover plate 4. The space between the fixed cone disc and the partition 1.1 is utilized to make the oil-gas separator 2 compactly arranged within the gearbox.

[0032] The housing 1 is further optimized. The housing 1 includes a central shell 1.2 and covers and an oil pan 1.3 located at both ends of the central shell 1.2. A partition 1.1 divides the central shell 1.2 into an upper chamber 9 for installing the drive pulley and a lower chamber 10 for installing the forward clutch. The oil discharged from the drain port 7 is directly discharged into the oil pan 1.3.

[0033] In this embodiment, the oil-gas separation chamber 2 has a compact structure, which will not cause an increase in the local size of the transmission assembly and thus interfere with the arrangement of the surrounding pipelines and other components of the transmission; the oil-gas separation chamber 2 is set on the partition 1.1 inside the transmission, without changing the external structure of the transmission assembly, and prevents local encroachment on the compact space inside the engine compartment; the oil-gas separation chamber 2 has a simple structure and makes reasonable use of the internal space of the transmission.

[0034] Example 3, as Figure 1 , Figure 2 , Figure 3 , Figure 4 The illustrated oil-gas separation device for a motorcycle gearbox includes a housing 1 and a partition 1.1 placed inside the housing 1. The partition 1.1 is provided with an oil-gas separation chamber 2 located between the drive pulley and the forward clutch. The oil-gas separation chamber 2 is connected to the chamber inside the housing 1 where the forward clutch is installed through an air inlet 5. The oil-gas separation chamber 2 is connected to the outside of the housing 1 through an air outlet 6. The oil-gas separation chamber 2 is provided with a labyrinth-type separation structure placed between the air inlet 5 and the air outlet 6.

[0035] In this embodiment, as Figure 1 As shown, the partition 1.1 has a mounting hole 1.1.1 for mounting the drive shaft between the drive pulley and the forward clutch. The oil-gas separation chamber 2 extends along the outer peripheral wall of the mounting hole 1.1.1 and is arranged in a meandering manner. The air inlet 5 is located at the beginning of the oil-gas separation chamber 2, the air outlet 6 is located at the end of the oil-gas separation chamber 2, and the oil outlet 7 is located at the meandering part of the oil-gas separation chamber 2. The gearbox contains a drive shaft and a drive pulley and a forward clutch mounted on the drive shaft. The drive shaft is mounted on the partition 1.1, and the drive pulley and the forward clutch are respectively located on both sides of the partition 1.1. This structure is a conventional technology. In this technical solution, the oil-gas separation chamber 2 is located between the drive pulley and the forward clutch, and the oil-gas separation chamber 2 extends along the outer peripheral wall of the mounting hole 1.1.1 and is arranged in a meandering manner. By making reasonable use of the external structure of the mounting hole 1.1.1 on the partition 1.1, the total length of the oil-gas separation stroke is increased by extending along the outer peripheral wall of the mounting hole 1.1.1 and being arranged in a meandering manner, thus increasing the oil-gas separation effect. Meanwhile, the air inlet 5 is located at the beginning of the oil-gas separation chamber 2, the air outlet 6 is located at the end of the oil-gas separation chamber 2, and the oil outlet 7 is located at the bend of the oil-gas separation chamber 2. The oil outlet 7 is set at a distance from the exhaust port to prevent a large amount of air from entering the oil outlet 7 and being directly discharged.

[0036] Further optimization of the oil-gas separator, such as Figure 1As shown, the oil-gas separation chamber 2 includes a first separation chamber 2.1 and a second separation chamber 2.2 extending along the outer peripheral wall of the mounting hole 1.1.1, and a connecting chamber 2.3 connecting the first separation chamber 2.1 and the second separation chamber 2.2. The first separation chamber 2.1 is located between the second separation chamber 2.2 and the mounting hole 1.1.1, and the oil outlet 7 is located in the connecting chamber 2.3. The first separation chamber 2.1 extends along the outer peripheral wall of the mounting hole 1.1.1, is connected through the connecting chamber 2.3, and is arranged in a circuitous manner before connecting to the second separation chamber 2.2 extending along the outer peripheral wall of the mounting hole 1.1.1. The air inlet 5 is located at the beginning of the first separation chamber 2.1, and the exhaust port is located at the end of the second separator, so that the air inlet 5 and the exhaust port are located on the same side of the mounting hole 1.1.1.

[0037] Further optimization of the maze-like separation structure, such as Figure 1 As shown, the labyrinth-type separation structure includes a separation baffle 8 placed inside the oil-gas separation chamber 2. The separation baffle 8 is fixed to the inner wall of the oil-gas separation chamber 2 and forms a separation port 8.1 between the baffle 8 and the inner wall of the oil-gas separation chamber 2. The separation baffle 8 divides the oil-gas separation chamber 2 into several separation chambers arranged along the length of the oil-gas separation chamber 2. The cross-sectional area of ​​the oil-gas separation chamber 2 is reduced by the separation port 8.1.

[0038] In this embodiment, the oil-gas separation chamber 2 is provided with an oil return groove 3.1, and an oil drain port 7 is provided at the upper part of the oil return groove 3.1. The oil drain port 7 connects the oil return groove 3.1 and the chamber in the housing 1 where the forward clutch is installed. Piston blow-by gas containing accumulated oil enters the oil-gas separation chamber 2 through the air inlet 5. Oil-gas separation is achieved under the action of the labyrinth-type separation structure. The separated gas is discharged through the air outlet 6, and the separated oil accumulates in the oil return groove 3.1 and is discharged through the oil drain port 7. The oil drain port 7 is located at the upper part of the oil return groove 3.1 to ensure smooth oil discharge. The air inlet 5 is larger than the oil drain port 7, so most of the piston blow-by gas enters through the air inlet 5 and is discharged through the air outlet.

[0039] The oil-gas separation chamber 2 is further optimized. The oil-gas separation chamber 2 includes an oil-gas separation tank 3 placed on a partition 1.1 and a cover plate 4 placed on the oil-gas separation tank 3. The structure of the oil-gas separation chamber 2 is relatively simple. The oil-gas separation tank 3 is integrally formed on the partition 1.1, and the cover plate 4 is placed on the oil-gas separation tank 3 to form the oil-gas separation chamber 2. A labyrinth-type separation structure is set inside the oil-gas separation tank 3.

[0040] The cover plate 4 is further optimized and is locked and fixed to the oil-gas separation tank 3 by a locking device. The outer edge of the oil-gas separation tank 3 is provided with a threaded hole, and the cover plate 4 is locked to the oil-gas separation tank 3 by the locking device.

[0041] The oil return tank 3.1 is further optimized, with its depth exceeding that of the oil-gas separation tank 3. The oil return tank 3.1 is used to collect oil, and the oil separated in the oil-gas separation chamber 2 is discharged from the oil outlet 7 of the oil return tank 3.1 after accumulation.

[0042] The oil-gas separator 3 is further optimized, with its opening facing the drive pulley. The cover plate 4 is located in the chamber where the drive pulley is installed within the housing 1. The drive pulley includes a fixed cone disc and a movable cone disc. The oil-gas separator 2 is located on the side facing the drive pulley, and the cover plate 4 is close to the fixed cone disc. The fixed cone disc does not affect the cover plate 4. The space between the fixed cone disc and the partition 1.1 is utilized to make the oil-gas separator 2 compactly arranged within the gearbox.

[0043] The housing 1 is further optimized. The housing 1 includes a central shell 1.2 and covers and an oil pan 1.3 located at both ends of the central shell 1.2. A partition 1.1 divides the central shell 1.2 into an upper chamber 9 for installing the drive pulley and a lower chamber 10 for installing the forward clutch. The oil discharged from the drain port 7 is directly discharged into the oil pan 1.3.

[0044] In this embodiment, the oil-gas separation chamber 2 has a compact structure, which will not cause an increase in the local size of the transmission assembly and thus interfere with the arrangement of the surrounding pipelines and other components of the transmission; the oil-gas separation chamber 2 is set on the partition 1.1 inside the transmission, without changing the external structure of the transmission assembly, and prevents local encroachment on the compact space inside the engine compartment; the oil-gas separation chamber 2 has a simple structure and makes reasonable use of the internal space of the transmission.

[0045] The specific embodiments described above are merely preferred embodiments of this utility model and are not intended to limit the specific scope of implementation of this utility model. All equivalent changes made to the shape and structure of this utility model should be included within the protection scope of this utility model.

Claims

1. An oil-gas separator for a motorcycle gearbox, comprising a housing and a partition disposed within the housing, characterized in that, The partition plate is provided with an oil-gas separation chamber located between the drive pulley and the forward clutch. The oil-gas separation chamber is connected to the chamber in the housing where the forward clutch is installed through the air inlet. The oil-gas separation chamber is connected to the outside of the housing through the air outlet. The oil-gas separation chamber is provided with a labyrinth-type separation structure placed between the air inlet and the air outlet.

2. The oil-gas separator for a motorcycle gearbox according to claim 1, characterized in that, The oil-gas separation chamber is provided with an oil return groove, and the upper part of the oil return groove is provided with an oil drain port. The oil drain port connects the oil return groove and the chamber in the housing where the forward clutch is installed.

3. The oil-gas separator for a motorcycle gearbox according to claim 2, characterized in that, The oil-gas separation chamber includes an oil-gas separation tank placed on a partition and a cover plate placed on the oil-gas separation tank.

4. The oil-gas separator for a motorcycle gearbox according to claim 3, characterized in that, The cover plate is locked and fixed to the oil-gas separator by a locking device.

5. The oil-gas separator for a motorcycle gearbox according to claim 3, characterized in that, The depth of the oil return tank is greater than the depth of the oil-gas separation tank.

6. The oil-gas separator for a motorcycle gearbox according to claim 3, characterized in that, The opening of the oil-gas separation tank faces the drive pulley, and the cover plate is located in the chamber inside the housing where the drive pulley is installed.

7. An oil-gas separator for a motorcycle gearbox according to claim 2, 3, 4, 5, or 6, characterized in that, The partition plate is provided with a mounting hole for mounting the drive shaft between the drive pulley and the forward clutch. The oil-gas separation chamber extends along the outer peripheral wall of the mounting hole and is arranged in a roundabout manner. The air inlet is located at the first end of the oil-gas separation chamber, the air outlet is located at the tail end of the oil-gas separation chamber, and the oil outlet is located at the roundabout part of the oil-gas separation chamber.

8. The oil-gas separator for a motorcycle gearbox according to claim 7, characterized in that, The oil-gas separation chamber includes a first separation chamber and a second separation chamber extending along the outer peripheral wall of the mounting hole, and a connecting chamber connecting the first separation chamber and the second separation chamber. The first separation chamber is located between the second separation chamber and the mounting hole, and the oil outlet is located in the connecting chamber.

9. The oil-gas separator for a motorcycle gearbox according to claim 7, characterized in that, The labyrinth-type separation structure includes a separation partition placed inside the oil-gas separation chamber. The separation partition is fixed to the inner wall of the oil-gas separation chamber and forms a separation port between the inner wall of the oil-gas separation chamber and the separation partition divides the oil-gas separation chamber into several separation chambers arranged along the length of the oil-gas separation chamber.

10. An oil-gas separator for a motorcycle gearbox according to claim 2, 3, 4, 5, or 6, characterized in that, The housing includes a central shell and covers and an oil pan located at both ends of the central shell. The partition divides the central shell into an upper chamber for installing the drive pulley and a lower chamber for installing the forward clutch.

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