Vent plug, transmission, and vehicle

Abstract

The present application relates to the technical field of vehicles. Provided are a vent plug, a transmission, and a vehicle. The vent plug comprises a main vent body and a plurality of waterproof air-permeable membranes, wherein the main vent body comprises an opening which defines an accommodating cavity and is in communication with the accommodating cavity, and the main vent body is provided with a vent hole, which is in communication with the accommodating cavity; the plurality of waterproof air-permeable membranes are all arranged in the accommodating cavity, the plurality of waterproof air-permeable membranes are all welded to the main vent body, and the plurality of waterproof air-permeable membranes are all located between the opening and the vent hole; and between two adjacent waterproof air-permeable membranes, the welding pressure between the waterproof air-permeable membrane close to the vent hole and the main vent body is greater than or equal to the welding pressure between the waterproof air-permeable membrane close to the opening and the main vent body. The vent plug of the present application can solve the problem of the high maintenance costs of a transmission due to the short service life of an existing vent plug comprising a waterproof air-permeable membrane.

Description

Vent plug, transmission and vehicle

[0001] Cross-reference to Related Applications

[0002] The present application claims priority to the Chinese patent application No. CN202410707226.9, filed on June 03, 2024, and entitled "Vent plug, transmission and vehicle", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0003] The present application relates to the technical field of vehicles, in particular to a vent plug, a transmission and a vehicle. BACKGROUND

[0004] With the development of vehicle technology, oil-cooled electric drive transmissions and hybrid power transmissions are increasingly widely used. Compared with traditional transmissions, oil-cooled electric drive transmissions and hybrid power transmissions have higher requirements for waterproofing and anti-arc discharge breakdown.

[0005] Mechanical vent plugs have relatively poor waterproof performance, and have a certain opening pressure and are prone to negative pressure, which increases the risk of arc discharge. Based on this, vent plugs including waterproof breathable membranes have appeared. The waterproof breathable membranes have no opening pressure and high protection capability. The waterproof breathable membranes have the capability that gas can pass through but water and oil droplets cannot pass through, and can meet the needs of oil-cooled electric drive transmissions and hybrid power transmissions.

[0006] However, oil has a significant impact on the air permeability of the waterproof breathable membrane. Long-term use of oil gas or aerosol-formed oil film blocks the waterproof breathable membrane, resulting in loss of air permeability of the waterproof breathable membrane. As a result, the service life of the vent plug including the waterproof breathable membrane is relatively short, resulting in high maintenance costs of the transmission.

[0007] SUMMARY

[0008] Therefore, the present application provides a vent plug, a transmission and a vehicle to solve the problem that the service life of the existing vent plug including the waterproof breathable membrane is relatively short, resulting in high maintenance costs of the transmission.

[0009] In a first aspect, the present application provides a vent plug, the vent plug comprising a vent body and a plurality of waterproof breathable membranes, the vent body comprising a containing cavity and an opening in communication with the containing cavity, the vent body being provided with a vent hole, the vent hole being in communication with the containing cavity;

[0010] The plurality of waterproof breathable membranes are arranged in the containing cavity, and the plurality of waterproof breathable membranes are welded to the vent body, the plurality of waterproof breathable membranes being located between the opening and the vent hole;

[0011] The welding pressure of the waterproof and breathable membrane close to the vent hole and the vent body is greater than or equal to the welding pressure of the waterproof and breathable membrane close to the opening and the vent body.

[0012] Beneficial effects: The vent plug is provided with a plurality of waterproof and breathable membranes, and the welding pressure of the waterproof and breathable membrane close to the vent hole and the vent body is greater than or equal to the welding pressure of the waterproof and breathable membrane close to the opening and the vent body. When the first waterproof and breathable membrane close to the opening is vented, oil and gas can be discharged through the plurality of waterproof and breathable membranes in turn. When the first waterproof and breathable membrane close to the opening is blocked, the pressure inside the transmission housing increases, and when the pressure increases to the welding pressure of the first waterproof and breathable membrane, the first waterproof and breathable membrane is disconnected from the vent body, and oil and gas can flow to the second waterproof and breathable membrane through the gap between the first waterproof and breathable membranes, and then be discharged through the subsequent waterproof and breathable membranes. In this way, the service life of the vent plug is improved, and the maintenance cost of the transmission is reduced.

[0013] In an optional embodiment, the vent body comprises a body part and a cover, one end of the body part is connected with the cover, the other end of the body part forms the opening, and the vent hole is formed in the cover.

[0014] In an optional embodiment, the body part comprises a plurality of connecting surfaces, the plurality of connecting surfaces are parallel, the plurality of connecting surfaces are perpendicular to the axis direction of the body part, and the plurality of connecting surfaces are arranged in the axis direction of the body part at intervals.

[0015] The plurality of connecting surfaces correspond to the plurality of waterproof and breathable membranes one by one, and at least part of the waterproof and breathable membranes are welded to the corresponding connecting surfaces.

[0016] In an optional embodiment, the vent plug further comprises a filter element, and the filter element is arranged in the accommodating cavity.

[0017] For any waterproof and breathable membrane, the filter element is located on the side of the waterproof and breathable membrane away from the vent hole.

[0018] In an optional embodiment, the body part comprises a first abutting surface and a second abutting surface, and the first abutting surface is located on the side of the second abutting surface away from the opening.

[0019] The filter element comprises a large-diameter part and a small-diameter part, the diameter of the large-diameter part is greater than the diameter of the small-diameter part, the large-diameter part is located on the side of the small-diameter part away from the opening, the large-diameter part abuts against the first abutting surface, and the small-diameter part abuts against the second abutting surface.

[0020] In an alternative embodiment, the vent body is provided with a plurality of vent holes which are arranged at intervals along the circumference of the vent body.

[0021] In an alternative embodiment, the vent plug further comprises a sealing member, the vent body comprises a mounting groove, and a portion of the sealing member is arranged in the mounting groove and another portion of the sealing member protrudes from the mounting groove.

[0022] In a second aspect, the present application provides a transmission, which comprises the vent plug as described above.

[0023] In an alternative embodiment, the transmission further comprises a housing which encloses a fixed space;

[0024] The housing is provided with a first installation hole which communicates with the fixed space, and the vent plug is fixed in the first installation hole, and the opening communicates with the first installation hole.

[0025] In an alternative embodiment, the housing is provided with a plurality of flow channels which are connected to each other, the flow channel at the leading end communicates with the fixed space, and the flow channel at the trailing end communicates with the first installation hole.

[0026] In a third aspect, the present application provides a vehicle, which comprises the transmission as described above. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0028] Fig. 1 shows a sectional view of a vent plug of an embodiment of the present application;

[0029] Fig. 2 shows a schematic diagram of the flow path of oil gas when the first waterproof and breathable film close to the opening of the vent plug is not blocked;

[0030] Fig. 3 shows a schematic diagram of the flow path of oil gas when the first waterproof and breathable film close to the opening of the vent plug is blocked;

[0031] Fig. 4 shows a schematic diagram of the flow path of oil gas when the first waterproof and breathable film close to the opening of the transmission is not blocked.

[0032] Explanation of reference signs:

[0033] 1-vent body; 11-body part; 111-opening; 12-cover body; 121-vent hole; 13-protruding part; 14-receiving cavity; 2-waterproof and breathable membrane; 3-filter core; 31-large diameter part; 32-small diameter part; 4-seal; 5-housing; 51-first installation hole; 52-second installation hole; 53-flow channel; 54-linkage channel; 55-fixing space; 6-oil baffle; 7-temperature and pressure sensor;

[0034] S1-connection surface; S2-first lamination surface; S3-second lamination surface; S4-support surface. DETAILED DESCRIPTION

[0035] To make the objectives, technical solutions, and superiorities of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described below in connection with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative effort belong to the scope of the present application.

[0036] According to the first aspect of the present application, a vent plug is provided, as shown in FIGS. 1-3, the vent plug comprises a vent body 1 and a plurality of waterproof and breathable membranes 2, the vent body 1 comprises a receiving cavity 14 and an opening 111 in communication with the receiving cavity 14, the vent body 1 is provided with a vent hole 121, the vent hole 121 is in communication with the receiving cavity 14; the plurality of waterproof and breathable membranes 2 are arranged in the receiving cavity 14, and the plurality of waterproof and breathable membranes 2 are welded with the vent body 1, the plurality of waterproof and breathable membranes 2 are located between the opening 111 and the vent hole 121; the welding pressure of the waterproof and breathable membrane 2 close to the vent hole 121 with the vent body 1 is greater than or equal to the welding pressure of the waterproof and breathable membrane 2 close to the opening 111 with the vent body 1.

[0037] In the vent plug of the present application, the plurality of waterproof and breathable membranes 2 are arranged, the welding pressure of the waterproof and breathable membrane 2 close to the vent hole 121 with the vent body 1 is greater than or equal to the welding pressure of the waterproof and breathable membrane 2 close to the opening 111 with the vent body 1, in this way, when the first waterproof and breathable membrane 2 close to the opening 111 is vented, the oil gas can be discharged in turn through the plurality of waterproof and breathable membranes 2. When the first waterproof and breathable membrane 2 close to the opening 111 is blocked, the pressure inside the housing 5 of the transmission increases, when the pressure increases to the welding pressure of the first waterproof and breathable membrane 2, the first waterproof and breathable membrane 2 is disconnected with the vent body 1, the oil gas can flow to the second waterproof and breathable membrane 2 through the gap between the first waterproof and breathable membrane 2, and then be discharged through the subsequent waterproof and breathable membranes 2. In this way, the last waterproof and breathable membrane 2 is blocked. In this way, the service life of the vent plug is improved, and the maintenance cost of the transmission is reduced.

[0038] Preferably, the opening welding pressure of the waterproof and breathable membrane 2 close to the vent hole 121 is greater than the opening welding pressure of the waterproof and breathable membrane 2 close to the opening 111, so that the opening welding pressure of the plurality of waterproof and breathable membranes 2 increases in the direction in which the opening 111 points to the vent hole 121, so as to facilitate the replacement work of the plurality of waterproof and breathable membranes 2.

[0039] In the embodiment of the present application, as shown in FIG. 1, the vent body 1 comprises a body part 11 and a cover 12, one end of the body part 11 is connected with the cover 12, the other end of the body part 11 forms an opening 111, the cover 12 is provided with a vent hole 121, the center line of the vent hole 121 is located on the side of the first waterproof and breathable membrane 2 close to the cover 12 and away from the opening 111, so as to facilitate the discharge of oil gas through the vent hole 121. Optionally, the body part 11 and the cover 12 can be threadedly connected or interference fit.

[0040] Further, the cover 12 is in a cylindrical shape, the cover 12 comprises a side plate and an end plate, the inner wall of the side plate abuts against the outer side wall of the body part 11, and the side plate is provided with the vent hole 121, which can prevent the occurrence of water accumulation phenomenon.

[0041] Optionally, the side plate is provided with a plurality of vent holes 121, the plurality of vent holes 121 are equidistantly arranged along the circumferential direction of the cover 12, and the oil gas can be discharged through any one of the vent holes 121. Preferably, the number of the vent holes 121 is four, and the four vent holes 121 are equidistantly arranged along the circumferential direction of the side plate.

[0042] As shown in FIG. 1, the body part 11 comprises a plurality of connecting surfaces S1, the plurality of connecting surfaces S1 are all perpendicular to the axial direction (vertical direction in FIG. 1) of the body part 11, and the plurality of connecting surfaces S1 are arranged at intervals along the axial direction of the body part 11. The plurality of waterproof and breathable membranes 2 are arranged in parallel, the number of the waterproof and breathable membranes 2 is the same as the number of the connecting surfaces S1, and the waterproof and breathable membranes 2 are one-to-one corresponding, and the waterproof and breathable membranes 2 are welded on the corresponding connecting surfaces S1.

[0043] Optionally, the end surface of the body part 11 close to the vent hole 121 is the first connecting surface S1, and the first waterproof and breathable membrane 2 close to the vent hole 121 is welded on the end surface of the body part 11 close to the vent hole 121. The second connecting surface S1 protrudes towards the axis of the body part 11 relative to the first connecting surface S1, and the third connecting surface S1 protrudes towards the axis of the body part 11 relative to the second connecting surface S1. In this way, the inside of the body part 11 is in a stepped shape, thereby forming the connecting surfaces S1, so as to facilitate the welding of the waterproof and breathable membranes 2 and the body part 11.

[0044] Optionally, the waterproof and breathable membrane 2 and the main body 11 are welded together by heating, and the welding strength is controlled by controlling the welding temperature and the penetration depth, so that the opening welding pressure of the waterproof and breathable membrane 2 close to the air hole 121 is greater than or equal to the waterproof and breathable membrane 2 of the opening 111.

[0045] Preferably, the opening welding pressure of the first waterproof and breathable membrane 2 close to the air hole 121 is greater than or equal to the maximum pressure of the oil gas in the housing 5 where the air plug is located, so as to avoid the opening welding of the first waterproof and breathable membrane 2 close to the air hole 121 causing oil overflow.

[0046] In the embodiment of the present application, as shown in FIG. 1, the air plug further comprises a filter element 3, which is arranged in the accommodating cavity 14; for any waterproof and breathable membrane 2, the filter element 3 is located on the side of the waterproof and breathable membrane 2 away from the air hole 121, that is, the filter element 3 is located on the side of the whole formed by the plurality of waterproof and breathable membranes 2 facing the opening 111. In this way, the filter element 3 can filter the waterproof and breathable membrane 2 before the oil gas flows through the waterproof and breathable membrane 2, wherein the larger oil droplets are adsorbed by the filter element 3 to avoid the larger oil droplets from blocking the waterproof and breathable membrane 2.

[0047] Further, the main body 11 further comprises a supporting surface S4, which is located on the side of the first waterproof and breathable membrane 2 close to the opening 111 and away from the opening 111, and the supporting surface S4 protrudes towards the axis of the main body 11 relative to any connecting surface S1, which makes the inner wall of the main body 11 on the side of the supporting surface S4 away from the air hole 121 form a first fitting surface S2, and the inner wall of the main body 11 on the side of the supporting surface S4 facing the opening 111 form a second fitting surface S3. The filter element 3 comprises a large diameter portion 31 and a small diameter portion 32, the diameter of the large diameter portion 31 is greater than the diameter of the small diameter portion 32, the large diameter portion 31 is located on the side of the small diameter portion 32 away from the opening 111, the large diameter portion 31 is fitted with the first fitting surface S2, and the small diameter portion 32 is fitted with the second fitting surface S3. In this way, the filter element 3 is fixed by being supported.

[0048] In addition, the air plug further comprises a protruding portion 13 protruding from the outer wall of the main body 11, the protruding portion 13 is in the shape of a ring, the protruding portion 13 is provided with a mounting groove recessed from the side of the protruding portion 13 facing the opening 111 to the inside of the protruding portion 13. The air plug further comprises a sealing element 4, part of the sealing element 4 is arranged in the mounting groove, and another part of the sealing element 4 protrudes from the mounting groove. When the air plug is installed on the housing 5, the end where the opening 111 of the main body 11 is located is inserted into the housing 5, and the sealing element 4 abuts against the outer wall of the housing 5, thereby realizing the sealing between the housing 5 and the air plug.

[0049] In the embodiments of the present application, the number of waterproof and breathable membranes 2 is two, three, four or more. Taking the case where the number of waterproof and breathable membranes 2 is two as an example, as shown in FIG. 1, the upper waterproof and breathable membrane 2 is welded on the end face of the main body part 11 close to the cover 12, and the lower waterproof and breathable membrane 2 is welded on the other connecting surface S1. The opening pressure of the upper waterproof and breathable membrane 2 can be greater than or equal to the maximum pressure of the oil gas in the shell 5 where the breather plug is located, and the maximum pressure of the oil gas in the shell 5 where the breather plug is located can be greater than or equal to the opening pressure of the lower waterproof and breathable membrane 2, so that the two waterproof and breathable membranes 2 work in turn.

[0050] When the lower waterproof and breathable membrane 2 is ventilated, as the temperature rises, the gas pressure in the shell 5 where the breather plug is located is greater than the pressure outside the shell 5, and the oil gas flows out through the lower waterproof and breathable membrane 2, the upper waterproof and breathable membrane 2 and the vent hole 121 in the direction indicated by the arrow in FIG. 2 to achieve pressure balance; part of the oil gas condenses into a film when passing through the lower waterproof and breathable membrane 2, blocking the gap between the lower waterproof and breathable membrane 2, so that the oil gas cannot continue to pass through, and the pressure in the shell 5 where the breather plug is located gradually rises, and when the pressure in the shell 5 is greater than the opening pressure of the lower waterproof and breathable membrane 2, the lower waterproof and breathable membrane 2 opens, forming a gap between the lower waterproof and breathable membrane 2 and the inner wall of the main body part 11. At this time, as shown in FIG. 3, the oil gas can directly pass through the gap between the lower waterproof and breathable membrane 2 and the inner wall of the main body part 11, and then flow out through the upper waterproof and breathable membrane 2 and the vent hole 121, and the upper waterproof and breathable membrane 2 works normally. In this way, the service life of the breather plug is improved.

[0051] In this way, through the breather plug of the present application, multiple waterproof and breathable membranes 2 work in turn, the service life of the breather plug is improved, and the maintenance cost of the transmission is reduced.

[0052] According to the second aspect of the present application, a transmission is provided, which comprises the above-mentioned breather plug, and has the same technical effects as the above-mentioned breather plug, which will not be described here.

[0053] As shown in FIG. 4, the transmission further comprises a shell 5 surrounding a fixed space 55; the shell 5 is provided with a first installation hole 51 communicating with the fixed space 55, and the breather plug is fixed in the first installation hole 51, and the opening 111 communicates with the first installation hole 51, so that the oil gas in the fixed space 55 can flow to the breather plug through the first installation hole 51 and the opening 111, and then flow out through the vent hole 121 of the breather plug.

[0054] The shell 5 is provided with a plurality of flow channels 53 connected with each other. The flow channel 53 at the front end is in communication with the fixed space 55, and the flow channel 53 at the tail end is in communication with the first installation hole 51. In this way, the oil in the shell 5 can be prevented from directly reaching the breather plug, thereby reducing the risk of the oil and aerosol blocking the waterproof and breathable film 2. Meanwhile, by providing a plurality of flow channels 53, the travel distance of the oil gas is increased, so that the oil gas can be liquefied and flow back.

[0055] Further, each flow channel 53 has an opening, and the openings of the plurality of flow channels 53 are directed to the same side. An oil baffle 6 is fixed to the inner side wall of the shell 5, and the openings of the plurality of flow channels 53 all face the oil baffle 6. The oil baffle 6 has a gap with the opening, so that the two adjacent flow channels 53 can be in communication through the two openings. The edge of the oil baffle 6 has a gap with the inner wall of the flow channel 53 at the front end, so that the flow channel 53 at the front end is in communication with the fixed space 55 through its own opening and the gap between the oil baffle 6 and the inner wall of the shell 5. The oil gas in the fixed space 55 flows to the breather plug through the plurality of flow channels 53. Optionally, the gap between the oil baffle 6 and the shell 5 can be 2-3 mm, which can ensure that the oil enters the flow channel 53 at the front end, while preventing the oil from entering other flow channels 53.

[0056] Optionally, the shell 5 is further provided with a connecting channel 54. One end of the connecting channel 54 is in communication with the first installation hole 51, and the other end of the connecting channel 54 is in communication with the flow channel 53 at the tail end. In this way, the fixed space 55 is in communication with the first installation hole 51 through the flow channel 53 and the connecting channel 54, so that the oil gas can reach the breather plug.

[0057] In addition, the transmission further comprises a temperature and pressure sensor 7. The shell 5 is provided with a second installation hole 52, which is in communication with the fixed space 55. The temperature and pressure sensor 7 is fixed in the second installation hole 52 and is threadedly connected with the hole wall of the second installation hole 52. The temperature and pressure sensor 7 can detect the temperature and pressure of the oil gas in the fixed space 55 surrounded by the shell 5. The temperature and pressure sensor 7 can be connected with a controller. By detecting the temperature, the controller can control the cooling system to work, so as to cool the transmission. Meanwhile, when the temperature and pressure sensor 7 detects that the pressure of the oil gas is greater than a predetermined pressure, the controller can alarm, and at this time, the breather plug can be replaced to prevent oil leakage caused by excessive pressure.

[0058] Preferably, the predetermined pressure is less than the opening pressure of the first waterproof and breathable film 2 close to the breather hole 121.

[0059] With the example of the breather plug including two waterproof and breathable membranes 2 and the number of flow channels 53 being two, when the waterproof and breathable membrane 2 close to the opening 111 is ventilated, as the temperature rises, the pressure of the oil gas in the fixed space 55 is greater than the pressure outside the shell 5, the oil gas flows in the direction shown by the arrows as shown in FIG. 4, that is, the oil gas in the fixed space 55 passes through the two flow channels 53 and the one connecting channel 54 in turn to reach the breather plug, part of the oil gas condenses back into the fixed space 55 during the flow process, the remaining oil gas is filtered by the filter element 3, larger particles are adsorbed by the filter element 3, and the remaining oil gas continues to flow and is discharged through the lower waterproof and breathable membrane 2, the upper waterproof and breathable membrane 2 and the vent hole 121 in turn to achieve pressure balance.

[0060] When the waterproof and breathable membrane 2 close to the opening 111 is blocked, part of the oil gas condenses into a film when passing through the lower waterproof and breathable membrane 2, the lower waterproof and breathable membrane 2 is blocked, so that the oil gas cannot continue to pass through, the pressure of the oil gas in the fixed space 55 will gradually rise, when the pressure of the oil gas in the fixed space 55 is greater than the opening pressure of the lower waterproof and breathable membrane 2, the lower waterproof and breathable membrane 2 is opened, a gap is formed between the lower waterproof and breathable membrane 2 and the inner wall of the main body 11, at this time, the oil gas can pass through the gap between the lower waterproof and breathable membrane 2 and the inner wall of the main body 11, and then pass through the upper waterproof and breathable membrane 2 and the vent hole 121.

[0061] As the waterproof and breathable membrane 2 is used, when the upper waterproof and breathable membrane 2 is seriously blocked, the pressure of the oil gas in the fixed space 55 will rise, when the oil gas pressure reaches a predetermined pressure, the controller will alarm, at this time, the breather plug can be replaced. In this way, the breather plug is replaced before it completely fails, avoiding oil leakage of other sealing elements 4 and the breather plug itself.

[0062] According to the third aspect of the present application, a vehicle is provided, the vehicle comprising the transmission described above, the transmission having the same technical effects as the transmission described above, which will not be described here.

[0063] Although the embodiments of the present application are described in conjunction with the drawings, various modifications and changes can be made by those skilled in the art without departing from the spirit and scope of the present application, and such modifications and changes fall within the scope defined by the appended claims. Industrial applicability

[0064] The vent plug is provided with a plurality of waterproof air permeable membranes. The opening welding pressure of the waterproof air permeable membrane close to the vent hole and the vent body is greater than or equal to the opening welding pressure of the waterproof air permeable membrane close to the opening and the vent body. When the first waterproof air permeable membrane close to the opening is vented, oil gas can be discharged through the plurality of waterproof air permeable membranes in turn. When the first waterproof air permeable membrane close to the opening is blocked, the pressure inside the transmission housing increases. When the pressure increases to the opening welding pressure of the first waterproof air permeable membrane, the first waterproof air permeable membrane is disconnected from the vent body. Oil gas can flow to the second waterproof air permeable membrane through the gap between the first waterproof air permeable membrane, and then be discharged through the subsequent waterproof air permeable membranes. In this way, the service life of the vent plug is improved, and the maintenance cost of the transmission is reduced.

Claims

1. A vent plug, characterized in that, The vent plug comprises a vent body and a plurality of waterproof and breathable membranes, the vent body comprises a containing cavity and an opening in communication with the containing cavity, the vent body is provided with a vent hole in communication with the containing cavity; The plurality of waterproof and breathable membranes are arranged in the containing cavity, and the plurality of waterproof and breathable membranes are welded with the vent body, the plurality of waterproof and breathable membranes are located between the opening and the vent hole; The welding pressure between the waterproof and breathable membrane close to the vent hole and the vent body is greater than or equal to the welding pressure between the waterproof and breathable membrane close to the opening and the vent body.

2. The breather plug of claim 1, wherein, The vent body comprises a body part and a cover, one end of the body part is connected with the cover, the other end of the body part forms the opening, and the cover is provided with the vent hole.

3. The breather plug of claim 2, wherein, The body part comprises a plurality of connecting surfaces, the plurality of connecting surfaces are parallel, the plurality of connecting surfaces are perpendicular to the axis direction of the body part, and the plurality of connecting surfaces are arranged in the axis direction of the body part; The plurality of connecting surfaces correspond to the plurality of waterproof and breathable membranes one by one, and at least part of the waterproof and breathable membrane is welded with the corresponding connecting surface.

4. The breather plug of claim 2, wherein, The vent plug further comprises a filter element, and the filter element is arranged in the containing cavity; For any waterproof and breathable membrane, the filter element is located on the side of the waterproof and breathable membrane away from the vent hole.

5. The breather plug of claim 4, wherein, The body part comprises a first abutting surface and a second abutting surface, the first abutting surface is located on the side of the second abutting surface away from the opening; The filter element comprises a large-diameter part and a small-diameter part, the diameter of the large-diameter part is greater than the diameter of the small-diameter part, the large-diameter part is located on the side of the small-diameter part away from the opening, the large-diameter part abuts with the first abutting surface, and the small-diameter part abuts with the second abutting surface.

6. A breather plug according to any one of claims 1-5, characterized in that The vent body is provided with a plurality of vent holes, and the plurality of vent holes are arranged in the circumferential direction of the vent body.

7. The breather plug of claim 2, wherein, The vent plug further comprises a sealing element, the vent body comprises a mounting groove, part of the sealing element is arranged in the mounting groove, and the other part of the sealing element protrudes from the mounting groove.

8. A transmission characterized by, The transmission comprises the vent plug of any one of claims 1-7.

9. The transmission of claim 8, wherein, The transmission further comprises a housing, and the housing surrounds a fixed space; The housing is provided with a first installation hole in communication with the fixed space, the vent plug is fixed in the first installation hole, and the opening is in communication with the first installation hole.

10. The transmission of claim 9, wherein, The transmission further comprises a temperature and pressure sensor, the housing is provided with a second installation hole in communication with the fixed space, and the temperature and pressure sensor is fixed in the second installation hole.

11. The transmission of claim 9, wherein, The housing is provided with a plurality of flow channels connected with each other, a flow channel located at a front end is in communication with the fixed space, and a flow channel located at a tail end is in communication with the first installation hole.

12. A vehicle characterized by comprising: The vehicle comprises the transmission of any one of claims 8-11.

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