Vent plug, transmission and vehicle

Abstract

The application provides a breather plug, a transmission and a vehicle, and relates to the technical field of vehicles.The breather plug comprises a breather body and a plurality of waterproof and breathable membranes, the breather body comprises a containing cavity and an opening in communication with the containing cavity, the breather body is provided with a breather 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 all welded with the breather body, the plurality of waterproof and breathable membranes are all located between the opening and the breather hole, the welding pressure between the waterproof and breathable membrane close to the breather hole and the breather body is greater than or equal to the welding pressure between the waterproof and breathable membrane close to the opening and the breather body.The breather plug can solve the problem that the service life of the existing breather plug comprising waterproof and breathable membranes is relatively short, and the maintenance cost of the transmission is high.

Description

Technical Field

[0001] This application relates to the field of vehicle technology, and in particular to a breather plug, a transmission, and a vehicle. Background Technology

[0002] With the development of vehicle technology, oil-cooled electric drive transmissions and hybrid transmissions are being used more and more widely. Compared with traditional transmissions, oil-cooled electric drive transmissions and hybrid transmissions have higher requirements for waterproofing and protection against arc discharge breakdown.

[0003] Mechanical vent plugs have relatively poor waterproof performance and require a certain opening pressure, which can easily generate negative pressure and increase the risk of arc discharge. Therefore, vent plugs with waterproof and breathable membranes have emerged. These membranes have no opening pressure, offer high protection, and allow gas to pass through while preventing water and oil droplets from passing through, thus meeting the needs of oil-cooled electric transmissions and hybrid transmissions.

[0004] However, the fluid has a significant impact on the breathability of the waterproof and breathable membrane. Long-term use can lead to the formation of an oil film that blocks the membrane, resulting in a loss of its breathability. Consequently, the lifespan of the breather plug, including the waterproof and breathable membrane, is relatively short, leading to higher transmission maintenance costs. Summary of the Invention

[0005] In view of this, this application provides a vent plug, a transmission, and a vehicle to solve the problem that existing vent plugs, including waterproof and breathable membranes, have a relatively short service life, resulting in high transmission maintenance costs.

[0006] According to a first aspect of this application, a vent plug is provided, the vent plug comprising a vent body and a plurality of waterproof and breathable membranes, the vent body comprising an enclosure of a receiving cavity and an opening communicating with the receiving cavity, the vent body having a vent hole communicating with the receiving cavity;

[0007] The plurality of waterproof and breathable membranes are all disposed within the receiving cavity, and the plurality of waterproof and breathable membranes are all welded to the ventilated body, and the plurality of waterproof and breathable membranes are all located between the opening and the vent hole;

[0008] Between two adjacent waterproof and breathable membranes, the welding pressure between the waterproof and breathable membrane near the vent and the vent body is greater than or equal to the welding pressure between the waterproof and breathable membrane near the opening and the vent body.

[0009] Preferably, the ventilation body includes a main body and a cover, one end of the main body is connected to the cover, the other end of the main body forms the opening, and the cover has the ventilation hole.

[0010] Preferably, the main body part comprises a plurality of connecting surfaces, the plurality of connecting surfaces are parallel, the plurality of connecting surfaces are perpendicular to the axial direction of the main body part, and the plurality of connecting surfaces are arranged in the axial direction of the main body part at intervals.

[0011] 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.

[0012] Preferably, the breather plug further comprises a filter element, and the filter element is arranged in the accommodation cavity.

[0013] For any waterproof and breathable membrane, the filter element is located on the side of the waterproof and breathable membrane opposite to the breather hole.

[0014] Preferably, the main 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 opposite to the opening.

[0015] The filter element comprises a large-diameter part and a small-diameter part, the diameter of the large-diameter part is larger than the diameter of the small-diameter part, the large-diameter part is located on the side of the small-diameter part opposite to the opening, the large-diameter part abuts against the first abutting surface, and the small-diameter part abuts against the second abutting surface.

[0016] Preferably, the breather body is provided with a plurality of breather holes, and the plurality of breather holes are arranged at intervals in the circumferential direction of the breather body.

[0017] Preferably, the breather plug further comprises a sealing element, the breather body comprises a mounting groove, part of the sealing element is arranged in the mounting groove, and another part of the sealing element protrudes from the mounting groove.

[0018] According to a second aspect of the present application, a transmission is provided, and the transmission comprises the breather plug.

[0019] Preferably, the transmission further comprises a housing, and the housing encloses a fixed space.

[0020] The housing is provided with a first installation hole, the first installation hole communicates with the fixed space, the breather plug is fixed in the first installation hole, and the opening communicates with the first installation hole.

[0021] Preferably, the transmission further comprises a temperature and pressure sensor, the housing is provided with a second installation hole, the second installation hole communicates with the fixed space, and the temperature and pressure sensor is fixed in the second installation hole.

[0022] Preferably, the housing is provided with a plurality of flow channels connected in series, the flow channel located at the front end communicates with the fixed space, and the flow channel located at the tail end communicates with the first installation hole.

[0023] According to a first aspect of the present application, there is provided a vehicle comprising the transmission described above.

[0024] In the breather plug of the present application, a plurality of waterproof air permeable membranes are arranged, and 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 in turn through the plurality of waterproof air permeable membranes. When the first waterproof air permeable membrane close to the opening is blocked, the pressure inside the transmission housing increases, and 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, and 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 membrane. In this way, the service life of the breather plug is improved, and the maintenance cost of the transmission is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0026] Figure 1 A cross-sectional view of a breather plug according to an embodiment of the present application is shown;

[0027] Figure 2 A schematic diagram of the flow path of oil gas when the first waterproof air permeable membrane close to the opening of a breather plug including two waterproof air permeable membranes is not blocked is shown;

[0028] Figure 3 A schematic diagram of the flow path of oil gas when the first waterproof air permeable membrane close to the opening of a breather plug including two waterproof air permeable membranes is blocked is shown;

[0029] Figure 4 A schematic diagram of the flow path of oil gas when the first waterproof air permeable membrane close to the opening of a breather plug including two waterproof air permeable membranes is not blocked is shown.

[0030] Legend: 1 - vent body; 11 - body part; 111 - opening; 12 - cover; 121 - vent hole; 13 - protruding part; 14 - accommodating cavity; 2 - waterproof air permeable membrane; 3 - filter element; 31 - large diameter part; 32 - small diameter part; 4 - sealing member; 5 - housing; 51 - first mounting hole; 52 - second mounting hole; 53 - flow passage; 54 - connection passage; 55 - fixing space; 6 - oil baffle; 7 - temperature and pressure sensor;

[0031] S1 - connecting surface; S2 - first bonding surface; S3 - second bonding surface; S4 - bearing surface. DETAILED DESCRIPTION

[0032] The following detailed description is presented to aid in understanding the method, apparatus and / or system described herein. It is not intended to limit the method, apparatus and / or system described herein to the exact construction details described. Various changes, modifications and equivalents can be resorted to without departing from the scope of the disclosure herein. For example, the order in which operations are described is not necessarily the order in which operations are performed. Additionally, features described herein can be implemented in software and / or hardware. Furthermore, features described herein can be implemented in different forms.

[0033] The features described herein can be implemented in different forms and should not be construed as limited to the examples described herein. Rather, these examples have been provided so that this disclosure will be thorough and complete, and will fully convey the scope of the methods, apparatus and / or systems described herein to those skilled in the art. Further, the description should not be construed to mean that the described examples are the only ones in which the methods, apparatus and / or systems described herein can be implemented.

[0034] Throughout the specification, when an element (such as a layer, region or substrate) is referred to as being "on" another element, "connected to" another element, "coupled to" another element, "adjacent to" another element, or "covering" another element, it can be directly on, connected to, coupled to, adjacent to, or covering the other element, or one or more other elements can be interposed therebetween. In contrast, when an element is referred to as being "directly on", "directly connected to", "directly coupled to", "directly adjacent to", or "directly covering" another element, there are no other elements interposed therebetween.

[0035] As used herein, the term "and / or" includes any one of the listed items and any combination of two or more of the listed items.

[0036] Although terms such as "first" and "second" and "third" can be used herein to describe various elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. Rather, these terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, elements, components, regions, layers and / or sections described herein as being called a first element, component, region, layer or section can also be called a second element, component, region, layer or section, without departing from the teachings of the examples.

[0037] For ease of description, spatial relationship terms, such as "on", "upper", "under", and "lower", can be used herein to describe the relationship between one element and another element as shown in the drawings. Such spatial relationship terms are intended to encompass different orientations of the device in use or operation, in addition to the orientation depicted in the drawings. For example, if the device in the drawings is turned over, an element described as on "upper" or "upper" relative to another element would then be oriented "under" or "lower" relative to the other element. Accordingly, the term "on" encompasses both an "on" and "under" orientation based on the spatial orientation of the device. The device can be oriented in other ways (e.g., rotated 90 degrees or at other orientations) and an appropriate re-interpretation of the spatial relationship terms used herein will be made.

[0038] The terminology used herein is for the purpose of describing various examples only and is not intended to be limiting of the present disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises", "comprising", "includes", "including" and "has", "having" as used herein, are specifically intended to be construed as open-ended terms, i.e., to mean "including, but not limited to", "including, but not limited to", "including, but not limited to" and "including, but not limited to", respectively.

[0039] Variations in the shapes of the elements shown in the drawings can occur as a result of manufacturing processes and / or tolerances. Thus, the examples described herein are not limited to the specific shapes of the elements shown in the drawings, but include variations in shapes that would occur as a result of manufacturing processes.

[0040] The features of the examples described herein can be combined in a variety of ways as will be apparent after review of the disclosure. Additionally, although various examples have been described herein, it will be apparent to those of ordinary skill in the art that many modifications, combinations, sub-combinations and variations of examples described herein can be made, and that such modifications, combinations, sub-combinations and variations are also within the scope of the disclosure.

[0041] According to a first aspect of the present application, there is provided a vent plug, such as Figures 1 to 3As shown, the breather plug comprises a breather body 1 and a plurality of waterproof breathable membranes 2, the breather body 1 comprises a containing cavity 14 and an opening 111 which is in communication with the containing cavity 14, the breather body 1 is provided with a breather hole 121 which is in communication with the containing cavity 14; the plurality of waterproof breathable membranes 2 are arranged in the containing cavity 14, and the plurality of waterproof breathable membranes 2 are welded with the breather body 1, the plurality of waterproof breathable membranes 2 are located between the opening 111 and the breather hole 121; between two adjacent waterproof breathable membranes 2, the welding pressure of the waterproof breathable membrane 2 close to the breather hole 121 with the breather body 1 is greater than or equal to the welding pressure of the waterproof breathable membrane 2 close to the opening 111 with the breather body 1.

[0042] In the breather plug of the present application, the plurality of waterproof breathable membranes 2 are arranged, the welding pressure of the waterproof breathable membrane 2 close to the breather hole 121 with the breather body 1 is greater than or equal to the welding pressure of the waterproof breathable membrane 2 close to the opening 111 with the breather body 1, so that when the first waterproof breathable membrane 2 close to the opening 111 is ventilated, the oil gas can be discharged through the plurality of waterproof breathable membranes 2 in turn. When the first waterproof 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 breathable membrane 2, the first waterproof breathable membrane 2 is disconnected with the breather body 1, the oil gas can flow to the second waterproof breathable membrane 2 through the gap between the first waterproof breathable membrane 2, and then be discharged through the subsequent waterproof breathable membranes 2. By analogy, until the last waterproof breathable membrane 2 is blocked. In this way, the service life of the breather plug is improved, and the maintenance cost of the transmission is reduced.

[0043] Preferably, the welding pressure of the waterproof breathable membrane 2 close to the breather hole 121 with the breather body 1 is greater than the welding pressure of the waterproof breathable membrane 2 close to the opening 111 with the breather body 1, so that in the direction in which the opening 111 points to the breather hole 121, the welding pressure of the plurality of waterproof breathable membranes 2 increases, so as to facilitate the replacement work of the plurality of waterproof breathable membranes 2.

[0044] In the embodiment of the present application, as shown in the drawings, Figure 1 The breather 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 the opening 111, the cover 12 is provided with the breather hole 121, the center line of the breather hole 121 is located on the side of the first waterproof breathable membrane 2 close to the cover 12 which is opposite to the opening 111, so as to facilitate the oil gas to be discharged through the breather hole 121. Alternatively, the body part 11 and the cover 12 can be threadedly connected or interference fit.

[0045] 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, the side plate is provided with the breather hole 121, which can prevent the accumulation of water.

[0046] Optionally, a plurality of vent holes 121 are provided on the side plate, and the plurality of vent holes 121 are equidistantly arranged along the circumference of the cover 12, and oil and gas can be discharged through any one of the vent holes 121. Preferably, the number of vent holes 121 is four, and the four vent holes 121 are equidistantly arranged along the circumference of the side plate.

[0047] like Figure 1 As shown, the main body 11 includes multiple connecting surfaces S1, all of which are perpendicular to the axis of the main body 11 (in the direction of the axis). Figure 1 The vertical direction is perpendicular, and multiple connecting surfaces S1 are arranged at intervals along the axial direction of the main body 11. Multiple waterproof and breathable membranes 2 are arranged in parallel, and the number of waterproof and breathable membranes 2 is the same as the number of connecting surfaces S1, and they correspond one-to-one. The waterproof and breathable membranes 2 are welded to the corresponding waterproof and breathable membranes 2.

[0048] Optionally, the end face of the main body 11 near the vent 121 is the first connecting surface S1, and the first waterproof and breathable membrane 2 near the vent 121 is welded to the end face of the main body 11 near the vent 121. The second connecting surface S1 protrudes relative to the first connecting surface S1 toward the axis of the main body 11, and the third connecting surface S1 protrudes relative to the second connecting surface S1 toward the axis of the main body 11. In this way, the interior of the main body 11 is stepped, thereby forming the connecting surface S1 to facilitate welding of the waterproof and breathable membrane 2 to the main body 11.

[0049] Optionally, the waterproof and breathable membrane 2 is welded together with the main body 11 by heating. The welding strength is controlled by controlling the welding temperature and the penetration depth, so that in the adjacent waterproof and breathable membranes 2, the opening pressure of the waterproof and breathable membrane 2 near the vent 121 is greater than or equal to that of the waterproof and breathable membrane 2 with opening 111.

[0050] Preferably, the welding pressure of the first waterproof and breathable membrane 2 near the vent 121 is greater than or equal to the maximum oil and gas pressure inside the housing 5 where the vent plug is located, so as to avoid the oil overflow caused by the welding of the first waterproof and breathable membrane 2 near the vent 121.

[0051] In the embodiments of this application, such as Figure 1 As shown, the vent plug also includes a filter element 3, which is disposed within the receiving cavity 14. For any of the waterproof and breathable membranes 2, the filter element 3 is located on the side of the waterproof and breathable membrane 2 opposite to the vent hole 121, that is, the filter element 3 is located on the side facing the opening 111 of the whole consisting of multiple waterproof and breathable membranes 2. In this way, before oil flows through the waterproof and breathable membrane 2, the filter element 3 can filter the waterproof and breathable membrane 2, wherein larger oil droplets will be adsorbed by the filter element 3 to prevent larger oil droplets from clogging the waterproof and breathable membrane 2.

[0052] 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 close to the opening 111, and the supporting surface S4 protrudes towards the axis of the main body 11 relative to any one connecting surface S1, which makes the inner wall of the main body 11 on the side of the supporting surface S4 towards the air vent hole 121 form the first fitting surface S2, and the inner wall of the main body 11 on the side of the supporting surface S4 towards the opening 111 form the second fitting surface S3. The filter element 3 comprises a large-diameter part 31 and a small-diameter part 32, the diameter of the large-diameter part 31 is greater than the diameter of the small-diameter part 32, the large-diameter part 31 is located on the side of the small-diameter part 32 away from the opening 111, the large-diameter part 31 is fitted with the first fitting surface S2, and the small-diameter part 32 is fitted with the second fitting surface S3. In this way, the support of the filter element 3 can be achieved, thereby achieving the fixation of the filter element 3.

[0053] In addition, the air vent body 1 further comprises a protruding part 13 protruding from the outer wall of the main body 11, the protruding part 13 is in the shape of a ring, and the protruding part 13 is provided with a mounting groove recessed from the side of the protruding part 13 towards the opening 111 to the inside of the protruding part 13. The air vent 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 vent plug is mounted on the shell 5, the end of the opening 111 of the main body 11 extends into the shell 5, and the sealing element 4 abuts against the outer wall of the shell 5, thereby achieving the sealing between the shell 5 and the air vent plug.

[0054] In the embodiments of the present application, the number of waterproof and breathable membranes 2 is two, three, four or more. Taking the case of two waterproof and breathable membranes 2 as an example, as shown in Figure 1 The opening welding 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 air vent plug is located, and the maximum pressure of the oil gas in the shell 5 where the air vent plug is located can be greater than or equal to the opening welding pressure of the lower waterproof and breathable membrane 2, so as to facilitate the two waterproof and breathable membranes 2 to work alternately.

[0055] When the lower waterproof and breathable membrane 2 is ventilated, as the temperature rises, the gas pressure in the shell 5 where the air vent plug is located is greater than the pressure outside the shell 5, and the oil gas flows out of the shell 5 according to Figure 2The oil gas is discharged in the direction indicated by the arrow in the figure through the waterproof and breathable film 2 located at the lower side, the waterproof and breathable film 2 located at the upper side, and the vent hole 121 to achieve pressure balance; part of the oil gas condenses into a film when passing through the waterproof and breathable film 2 located at the lower side, and the gap between the waterproof and breathable film 2 located at the lower side is blocked, so that the oil gas cannot continue to pass through, and the pressure in the shell 5 where the vent plug is located gradually increases. When the pressure in the shell 5 is greater than the opening pressure of the waterproof and breathable film 2 located at the lower side, the waterproof and breathable film 2 located at the lower side is opened, so that a gap is formed between the waterproof and breathable film 2 located at the lower side and the inner wall of the main body part 11. At this time, as shown in the figure, the oil gas can directly pass through the gap between the waterproof and breathable film 2 located at the lower side and the inner wall of the main body part 11, and then be discharged through the waterproof and breathable film 2 located at the upper side and the vent hole 121. The waterproof and breathable film 2 located at the upper side is in normal operation. In this way, the service life of the vent plug is improved. Figure 3

[0056] In this way, through the vent plug of the present application, multiple waterproof and breathable films 2 work in turn, the service life of the vent plug is improved, and the maintenance cost of the transmission is reduced.

[0057] According to a second aspect of the present application, a transmission is provided, which comprises the above-mentioned vent plug. The transmission has the same technical effects as the above-mentioned vent plug, and will not be described here.

[0058] As shown in the figure, Figure 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. The vent plug is fixed in the first installation hole 51. The opening 111 communicates with the first installation hole 51, so that the oil gas in the fixed space 55 can flow to the vent plug through the first installation hole 51 and the opening 111, and then be discharged through the vent hole 121 of the vent plug.

[0059] The shell 5 is provided with a plurality of flow channels 53 connected with each other. The flow channel 53 located at the leading end communicates with the fixed space 55, and the flow channel 53 located at the trailing end communicates with the first installation hole 51. In this way, the oil liquid in the shell 5 can be prevented from directly reaching the vent plug, thereby reducing the risk of the oil liquid and aerosol blocking the waterproof and breathable film 2. At the same time, 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.

[0060] ​Further, each of the flow channels 53 has an opening, the openings of the plurality of flow channels 53 are towards the same side, and the inner side wall of the shell 5 is fixed with an oil baffle 6, the openings of the plurality of flow channels 53 all face the oil baffle 6, and there is a gap between the oil baffle 6 and the opening, so that two adjacent flow channels 53 can be communicated through the two openings. There is a gap between the edge of the oil baffle 6 and the inner wall of the flow channel 53 located at the front end, so that the flow channel 53 located at the front end is communicated 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, and the oil gas in the fixed space 55 flows to the place where the breather plug is located 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.

[0061] Optionally, the shell 5 is further provided with a connecting channel 54, one end of the connecting channel 54 is communicated with the first mounting hole 51, and the other end of the connecting channel 54 is communicated with the flow channel 53 located at the tail end, so that the fixed space 55 is communicated with the first mounting hole 51 through the flow channel 53 and the connecting channel 54, thereby enabling the oil gas to reach the breather plug.

[0062] In addition, the transmission further comprises a temperature and pressure sensor 7, the shell 5 is provided with a second mounting hole 52, the second mounting hole 52 is communicated with the fixed space 55, and the temperature and pressure sensor 7 is fixed in the second mounting hole 52 and is screwed with the hole wall of the second mounting 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, and the controller can control the cooling system to work in order to cool the transmission according to the detected temperature. At the same time, 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 in order to fully prevent the problem of oil leakage caused by excessive pressure.

[0063] Preferably, the predetermined pressure is less than the opening welding pressure of the first waterproof and breathable film 2 close to the vent hole 121.

[0064] Taking the example that the breather plug comprises two waterproof and breathable films 2 and the number of flow channels 53 is two, when the first waterproof and breathable film 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, and the oil gas flows from the fixed space 55 to the breather plug through the flow channel 53 according to the pressure difference. Figure 4The oil gas in the fixed space 55 flows in the direction indicated by the arrow, that is, sequentially through the two flow channels 53 and the connecting channel 54 to the breather plug, part of the oil gas condenses back into the fixed space 55 during the flow, the rest of the oil gas is filtered by the filter element 3, the larger particles are adsorbed by the filter element 3, and the remaining oil gas continues to flow, sequentially passes through the lower waterproof air-permeable membrane 2, the upper waterproof air-permeable membrane 2 and the breather hole 121 and is discharged to achieve pressure balance.

[0065] When the waterproof air-permeable membrane 2 near the opening 111 is blocked, part of the oil gas condenses into a film when passing through the lower waterproof air-permeable membrane 2, the lower waterproof air-permeable 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 gradually rises, when the pressure of the oil gas in the fixed space 55 is greater than the opening pressure of the lower waterproof air-permeable membrane 2, the lower waterproof air-permeable membrane 2 is opened, a gap is formed between the lower waterproof air-permeable 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 air-permeable membrane 2 and the inner wall of the main body 11, and then pass through the upper waterproof air-permeable membrane 2 and the breather hole 121.

[0066] With the use of the waterproof air-permeable membrane 2, when the upper waterproof air-permeable membrane 2 is seriously blocked, the pressure of the oil gas in the fixed space 55 rises, when the pressure of the oil gas reaches a predetermined pressure, the controller alarms, at this time, the breather plug can be replaced. In this way, the breather plug is replaced before it fails completely, avoiding oil leakage of other sealing elements 4 and the breather plug itself.

[0067] According to a third aspect of the present application, a vehicle is provided, which comprises the transmission described above, and has the same technical effects as the transmission described above, and details are not repeated here.

[0068] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A vent plug, characterized in that, The vent plug includes a vent body and multiple waterproof and breathable membranes. The vent body includes an enclosure of a receiving cavity and an opening communicating with the receiving cavity. The vent body has vent holes that communicate with the receiving cavity. The plurality of waterproof and breathable membranes are all disposed within the receiving cavity, and the plurality of waterproof and breathable membranes are all welded to the ventilated body, and the plurality of waterproof and breathable membranes are all located between the opening and the vent hole; Between two adjacent waterproof and breathable membranes, the welding pressure between the waterproof and breathable membrane near the vent and the vent body is greater than or equal to the welding pressure between the waterproof and breathable membrane near the opening and the vent body. The ventilation body includes a main body and a cover. One end of the main body is connected to the cover, and the other end of the main body forms the opening. The cover has the ventilation hole. The main body includes multiple connecting surfaces, which are parallel and perpendicular to the axial direction of the main body. The multiple connecting surfaces are arranged at intervals along the axial direction of the main body. The plurality of connecting surfaces correspond one-to-one with the plurality of waterproof and breathable membranes, and at least a portion of the waterproof and breathable membrane is welded to the corresponding connecting surface; The end face of the main body near the vent is the first connecting surface. The upper waterproof and breathable membrane is welded to the end face of the main body near the cover, and the lower waterproof and breathable membrane is welded to the other connecting surface. Some oil and gas condense into a film when passing through the lower waterproof and breathable membrane, blocking the gaps in the lower waterproof and breathable membrane. This prevents the oil and gas from passing through, and the pressure inside the housing where the vent plug is located gradually increases. When the pressure inside the housing exceeds the welding pressure of the lower waterproof and breathable membrane, the lower waterproof and breathable membrane welds open, creating a gap between the lower waterproof and breathable membrane and the inner wall of the main body. The oil and gas then pass directly through the gap between the lower waterproof and breathable membrane and the inner wall of the main body, and are then discharged through the upper waterproof and breathable membrane and the vent.

2. The vent plug according to claim 1, characterized in that, The vent plug also includes a filter element, which is disposed within the receiving cavity; For any of the waterproof and breathable membranes, the filter element is located on the side of the waterproof and breathable membrane opposite to the vent.

3. The vent plug according to claim 2, characterized in that, The main body includes a first bonding surface and a second bonding surface, wherein the first bonding surface is located on the side of the second bonding surface opposite to the opening; The filter element includes a large-diameter portion and a small-diameter portion. The diameter of the large-diameter portion is larger than the diameter of the small-diameter portion. The large-diameter portion is located on the side of the small-diameter portion that is opposite to the opening. The large-diameter portion is fitted with the first contact surface, and the small-diameter portion is fitted with the second contact surface.

4. The vent plug according to any one of claims 1-3, characterized in that, The ventilation body has multiple ventilation holes, which are spaced apart along the circumference of the ventilation body.

5. The vent plug according to claim 1, characterized in that, The vent plug also includes a sealing element, the vent body includes a mounting groove, a portion of the sealing element is disposed in the mounting groove, and another portion of the sealing element protrudes from the mounting groove.

6. A transmission, characterized in that, The transmission includes a vent plug as described in any one of claims 1-5.

7. The transmission according to claim 6, characterized in that, The transmission also includes a housing that encloses a fixed space; The housing has a first mounting hole, which communicates with the fixed space. The vent plug is fixed inside the first mounting hole, and the opening communicates with the first mounting hole.

8. The transmission according to claim 7, characterized in that, The transmission also includes a temperature and pressure sensor. The housing has a second mounting hole, which communicates with the fixed space. The temperature and pressure sensor is fixed inside the second mounting hole.

9. The transmission according to claim 7, characterized in that, The housing has multiple interconnected flow channels. The flow channel at the first end is connected to the fixed space, and the flow channel at the last end is connected to the first mounting hole.

10. A vehicle, characterized in that, The vehicle includes the transmission as described in any one of claims 6-9.

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