Waterproof ventilation plug and automobile

Abstract

The invention discloses a waterproof ventilation plug and an automobile, and belongs to the technical field of automobiles. The waterproof ventilation plug comprises a valve seat, a valve element assembly, an exhaust spring, a ventilation film framework, a waterproof ventilation film and a ventilation plug cover; the upper portion of the valve seat and the lower portion of the breathable film framework are fixed and connected in a sealed mode to form an internal hollow structure, the valve element assembly and the exhaust spring are located in the internal hollow structure, and the exhaust spring is located at the top end of the valve element assembly. A breathable film installation hole is formed in the upper portion of the breathable film framework and used for installing the waterproof breathable film, the breathable plug cover is installed on the upper portion of the breathable film framework and wraps the structure, and the inner top face of the breathable plug cover is rigidly and fixedly connected with a plurality of top columns on the breathable film framework. The waterproof ventilation plug can achieve two-way ventilation of a transmission box body, can effectively prevent water and dust, has good ventilation performance after being durable, effectively avoids the defects of a normally-open ventilation plug, a one-way valve type ventilation plug and a waterproof ventilation film type ventilation plug in the current market, and is suitable for popularization and application. And the reliability of the oil-cooled hybrid transmission and the oil-cooled electric drive system is ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of automobiles, and in particular relates to a waterproof vent plug and an automobile. Background Art

[0002] The breather plug is an important component of the transmission. Its main function is to maintain the pressure balance inside the transmission case. When the internal temperature and pressure of the transmission rise during operation, the excess gas inside needs to be quickly discharged to the outside of the transmission to ensure the stability of the internal pressure. If the internal pressure is too high, it will cause the oil seal, gasket and other related sealing components to fail, resulting in oil leakage. At the same time, it also needs to have certain waterproof and dustproof capabilities.

[0003] With the rapid development of new energy vehicles, the transmission systems of these vehicles are gradually developing towards oil-cooled integrated hybrid transmissions and pure electric reducers. Since the internal motors and other electrical components have high requirements for waterproofing, the vent plugs need to have good waterproofing performance in addition to maintaining the internal pressure balance.

[0004] Conventional vent plugs are divided into three categories: normally open vent plugs, one-way valve vent plugs and waterproof breathable membrane vent plugs. Among them, the normally open vent plug can ensure the stability of the two-way pressure inside the transmission case, but its disadvantage is that it cannot effectively prevent the entry of external water and dust; the one-way valve vent plug can better prevent the entry of external water and dust, but can only realize the discharge of internal gas to the outside and cannot realize the entry of external gas into the transmission, resulting in negative pressure inside the transmission. When the negative pressure is too large, it will also affect the sealing performance of the sealing element. At the same time, too low negative pressure will cause the electrical breakdown distance to be reduced, causing safety hazards; the waterproof breathable membrane vent plug can ensure two-way ventilation and the entry of external water and dust, but it is mostly used in oil-free environments. For oil-cooled hybrid transmissions and electric drive systems, the process of discharging internal oil-containing gases will inevitably cause oil to contaminate the waterproof breathable membrane, resulting in diaphragm blockage. After long-term use, the air permeability will be reduced or even completely blocked, resulting in failure of the ventilation function. Summary of the invention

[0005] In view of the above-mentioned defects of conventional vent plugs in the prior art, the present invention provides a waterproof vent plug and a vehicle, which can realize two-way ventilation of the transmission case, and can effectively prevent water and dust, and have good ventilation performance after durability, effectively avoiding the shortcomings of normally open vent plugs, one-way valve vent plugs and waterproof breathable membrane vent plugs in the current market, and ensuring the reliability of oil-cooled hybrid transmission and oil-cooled electric drive system.

[0006] The present invention is achieved through the following technical solutions:

[0007] A waterproof vent plug comprises a valve seat 1, a valve core assembly 2, an exhaust spring 3, a breathable membrane frame 4, a waterproof breathable membrane 5 and a breathable plug cover 6; the upper part of the valve seat 1 is fixed and sealed to the lower part of the breathable membrane frame 4 to form an internal hollow structure, the valve core assembly 2 and the exhaust spring 3 are located in the internal hollow structure, the exhaust spring 3 is located at the top of the valve core assembly 2, the valve core assembly 2 can slide in the internal hollow structure, and the exhaust spring 3 provides spring force for the movement of the valve core assembly 2; a breathable membrane mounting hole is provided above the breathable membrane frame 4 for mounting the waterproof breathable membrane 5, the breathable plug cover 6 is mounted above the breathable membrane frame 4 and envelops the above structure, and the inner top surface of the breathable plug cover 6 is rigidly fixed to a plurality of top columns on the breathable membrane frame 4.

[0008] Furthermore, the upper part of the valve seat 1 and the lower part of the breathable membrane skeleton 4 are connected by welding, bonding or interference fit.

[0009] Furthermore, the valve seat 1 is cylindrical, and is formed by a mounting outer circle 1-1 and a valve core mating surface 1-3 connected by a limiting surface. The mounting outer circle 1-1 is used to cooperate with the transmission case, and the interior of the mounting outer circle 1-1 is a main ventilation channel 1-2. The valve core mating surface 1-3 is provided with several valve seat ventilation holes 1-4 connected to the outer wall.

[0010] Furthermore, the valve core assembly 2 is composed of a valve core 2-1, a valve core cover plate 2-2, an intake core body 2-3 and an intake spring 2-4; the valve core cover plate 2-2 is rigidly connected to the valve core 2-1, and the formed internal closed structure is provided with an intake core body 2-3 and an intake spring 2-4, the connecting guide rod of the intake core body 2-3 is inserted into the bottom of the exhaust seat 2-1-4 of the valve core 2-1, and the intake spring 2-4 is mounted on the intake core body 2-3, and the spring force is used to push the intake core body 2-3 to fit with the valve core cover plate 2-2, thereby sealing the intake channel 2-2-2 on the valve core cover plate 2-2.

[0011] Furthermore, the valve core 2-1 is cylindrical, including an outer wall 2-1-1, a cylindrical exhaust seat 2-1-4 nested therein, and a valve core ventilation channel 2-1-2 enveloping the interior; a plurality of ventilation holes 2-1-3 are provided on the outer wall 2-1-1, and a plurality of ventilation channels 2-1-5 are provided on the exhaust seat 2-1-4, and the ventilation channels 2-1-5 are used to connect the interior of the exhaust seat 2-1-4 with the valve core ventilation channel 2-1-2; an inner circular hole 2-1-6 is also provided above the exhaust seat 2-1-4 for cooperating and connecting with the outer circular surface 2-2-1 of the valve core cover plate 2-2, and a support hole 2-1-7 is provided below the exhaust seat 2-1-4 for cooperating with the connecting guide rod of the intake core 2-3.

[0012] Furthermore, the valve core cover plate 2-2 is a circular cover plate having an outer circular surface 2-2-1, and an air inlet channel 2-2-2 is provided on the top of the outer circular surface 2-2-1.

[0013] Furthermore, the upper part of the air intake core 2 - 3 is a sheet body, and the lower part is rigidly connected to a connecting guide rod.

[0014] Furthermore, the breathable membrane skeleton 4 is a cylindrical shape as a whole, with a conical surface 4-1 on the top, a breathable membrane mounting hole 4-2 is provided at the top of the conical surface 4-1, a plurality of top columns 4-3 are evenly provided around the outer side of the conical surface 4-1, and a plurality of shielding ribs 4-4 are provided on the outer circumferential surface of the breathable membrane skeleton 4.

[0015] Furthermore, the waterproof breathable membrane 5 is a disc-type PTFE waterproof head breathable membrane, which has the characteristics of ventilation and hydrophobicity, that is, air can pass through, but water and dust cannot pass through.

[0016] The vent plug cover 6 is a cylindrical structure with an open bottom.

[0017] On the other hand, the present invention also provides a car, comprising the above-mentioned waterproof vent plug.

[0018] Compared with the prior art, the advantages of the present invention are as follows:

[0019] The waterproof vent plug and the automobile of the present invention can realize two-way ventilation of the transmission case, and can effectively prevent water and dust, and have good ventilation performance after durability, effectively avoiding the shortcomings of normally open vent plugs, one-way valve vent plugs and waterproof breathable membrane vent plugs on the current market, and ensuring the reliability of the oil-cooled hybrid transmission and the oil-cooled electric drive system. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the description of the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0021] Figure 1 It is a schematic structural diagram of a waterproof vent plug of the present invention;

[0022] Figure 2 An exploded view of a waterproof vent plug of the present invention;

[0023] Figure 3 It is a schematic diagram of the valve seat structure of a waterproof vent plug of the present invention;

[0024] Figure 4 It is a schematic structural diagram of a valve core assembly of a waterproof vent plug of the present invention;

[0025] Figure 5 It is a schematic diagram of the valve core structure of a waterproof vent plug of the present invention;

[0026] Figure 6 It is a schematic diagram of the structure of a valve core cover plate of a waterproof vent plug of the present invention;

[0027] Figure 7 It is a schematic diagram of the air-permeable membrane skeleton structure of a waterproof vent plug of the present invention;

[0028] Figure 8 It is a schematic structural diagram of a waterproof vent plug of the present invention in a closed state;

[0029] Fig. 9 It is a schematic diagram of the air path structure of a waterproof vent plug in the exhaust state of the present invention;

[0030] Fig.10 It is a schematic diagram of the air path structure of a waterproof vent plug of the present invention in the air intake state;

[0031] In the figure:

[0032] Valve seat 1, valve core assembly 2, exhaust spring 3, breathable membrane frame 4, waterproof breathable membrane 5, breathable plug cover 6;

[0033] Install the outer circle 1-1, the main ventilation channel 1-2, the valve core matching surface 1-3, and the valve seat ventilation hole 1-4;

[0034] Valve core 2-1, valve core cover plate 2-2, air intake core body 2-3, air intake spring 2-4;

[0035] Outer wall 2-1-1, valve core ventilation channel 2-1-2, ventilation hole 2-1-3, exhaust seat 2-1-4, ventilation channel 2-1-5, inner circular hole 2-1-6, support hole 2-1-7;

[0036] Outer cylindrical surface 2-2-1, air intake passage 2-2-2;

[0037] Conical surface 4-1, breathable membrane mounting hole 4-2, top column 4-3, shielding rib 4-4; DETAILED DESCRIPTION

[0038] In order to clearly and completely describe the technical solution and its specific working process of the present invention, the specific implementation methods of the present invention are as follows in conjunction with the accompanying drawings of the specification:

[0039] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0041] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0042] Example 1

[0043] like Figure 1 and Figure 2As shown, this embodiment provides a waterproof vent plug, including a valve seat 1, a valve core assembly 2, an exhaust spring 3, a breathable membrane frame 4, a waterproof breathable membrane 5 and a breathable plug cover 6; the upper part of the valve seat 1 is fixed and sealed to the lower part of the breathable membrane frame 4 to form an internal hollow structure, the valve core assembly 2 and the exhaust spring 3 are located in the internal hollow structure, the exhaust spring 3 is located at the top of the valve core assembly 2, the valve core assembly 2 can slide in the internal hollow structure, and the exhaust spring 3 provides spring force for the movement of the valve core assembly 2; a breathable membrane mounting hole is provided above the breathable membrane frame 4 for mounting the waterproof breathable membrane 5, the breathable plug cover 6 is mounted above the breathable membrane frame 4 and envelops the above structure, and the inner top surface of the breathable plug cover 6 is rigidly fixed to a plurality of top columns on the breathable membrane frame 4.

[0044] In this embodiment, the upper part of the valve seat 1 and the lower part of the air-permeable membrane frame 4 are connected by welding, bonding or interference fit.

[0045] like Figure 3 As shown, the structure of the valve seat is introduced in detail below. The valve seat 1 is cylindrical, and is composed of a mounting outer circle 1-1 and a valve core matching surface 1-3 connected by a limit surface. The mounting outer circle 1-1 is used to match with the transmission case, and the interior of the mounting outer circle 1-1 is a main ventilation channel 1-2. The valve core matching surface 1-3 is provided with a plurality of valve seat ventilation holes 1-4 connected to the outer wall.

[0046] like Figure 4 As shown, the structure of the valve core assembly is introduced in detail below. The valve core assembly 2 is composed of a valve core 2-1, a valve core cover plate 2-2, an air intake core body 2-3 and an air intake spring 2-4; the valve core cover plate 2-2 is rigidly connected to the valve core 2-1, and the internal closed structure formed is provided with an air intake core body 2-3 and an air intake spring 2-4. The connecting guide rod of the air intake core body 2-3 is inserted into the bottom of the exhaust seat 2-1-4 of the valve core 2-1, and the air intake spring 2-4 is mounted on the air intake core body 2-3. The spring force is used to support the air intake core body 2-3 and fit the valve core cover plate 2-2, thereby sealing the air intake channel 2-2-2 on the valve core cover plate 2-2.

[0047] like Figure 5As shown, the structure of the valve core is introduced in detail below. The valve core 2-1 is cylindrical, including an outer wall 2-1-1, a cylindrical exhaust seat 2-1-4 nested inside it, and a valve core ventilation channel 2-1-2 enveloping the interior; a plurality of ventilation holes 2-1-3 are provided on the outer wall 2-1-1, and a plurality of ventilation channels 2-1-5 are provided on the exhaust seat 2-1-4. The ventilation channels 2-1-5 are used to connect the interior of the exhaust seat 2-1-4 with the valve core ventilation channel 2-1-2; an inner circular hole 2-1-6 is also provided above the exhaust seat 2-1-4 for cooperating and connecting with the outer circular surface 2-2-1 of the valve core cover plate 2-2, and a support hole 2-1-7 is provided below the exhaust seat 2-1-4 for cooperating with the connecting guide rod of the intake core 2-3.

[0048] like Figure 6 As shown, the structure of the valve core cover plate is described in detail below. The valve core cover plate 2-2 is a circular cover plate having an outer circular surface 2-2-1, and an air intake channel 2-2-2 is provided on the top of the outer circular surface 2-2-1.

[0049] The upper part of the air intake core 2-3 is a sheet body, and the lower part is rigidly connected to a connecting guide rod.

[0050] like Figure 6 As shown, the structure of the breathable membrane skeleton is introduced in detail below. The breathable membrane skeleton 4 is a cylindrical shape as a whole, with a conical surface 4-1 on the top, a breathable membrane mounting hole 4-2 is provided on the top of the conical surface 4-1, and a plurality of top columns 4-3 are evenly arranged around the outer side of the conical surface 4-1. The outer circular surface of the breathable membrane skeleton 4 is provided with a plurality of shielding ribs 4-4.

[0051] The waterproof breathable membrane 5 is a disc-type PTFE waterproof head breathable membrane, which has the characteristics of ventilation and hydrophobicity, that is, air can pass through, but water and dust cannot pass through.

[0052] The vent plug cover 6 is a cylindrical structure with an open bottom.

[0053] The working principle of a waterproof vent plug of this embodiment is as follows:

[0054] like Figure 8 and Fig. 9 As shown, when the internal pressure increases during the operation of the transmission, the internal pressure pushes the valve core assembly to overcome the spring force of the exhaust spring and move upward. After moving to the upper stroke limit, several vent holes on the valve core are connected to the vent holes on the valve seat, and the internal gas passes through the main ventilation channel on the valve seat, the vent holes on the valve core, the vent holes on the valve seat, and the gap between the vent plug cover and the valve seat in sequence, and is finally discharged from the entire vent plug.

[0055] During the internal pressure increase process, due to the action of internal pressure and the force of the intake spring, the intake core and the valve core cover are tightly fitted to ensure that the intake passage is in a closed state. The gas can only flow out from the exhaust passage. At the same time, the outflowing oil-containing gas is blocked by the shielding ribs on the breathable membrane frame and the pressure of the upper air path. It cannot reach the waterproof breathable membrane and can only be directly removed by the vent plug. The outside ensures that the waterproof breathable membrane will not contact the oil-containing gas to avoid blockage.

[0056] As the temperature and internal air pressure inside the transmission stabilize, the pressure difference inside and outside the transmission gradually balances, and the valve core assembly gradually returns to its position under the action of the exhaust spring, completing the exhaust process.

[0057] like Fig.10 As shown, when the transmission generates less heat during operation or the vehicle stops, the temperature inside the transmission gradually decreases. At this time, the internal pressure of the transmission will be lower than the external air pressure. At this time, the intake core overcomes the spring force of the intake spring and moves downward under the action of the pressure difference at both ends. After flowing through the waterproof breathable membrane, the external gas passes through the intake channel on the valve core cover, the exhaust seat cavity of the valve core, the air inlet on the exhaust seat cavity of the valve core, and the main ventilation channel on the valve seat, and finally enters the transmission.

[0058] When the transmission is wading and the pressure difference inside and outside the transmission is balanced, since the exhaust channel and the intake channel are both closed, external water cannot enter the transmission, and the conical surface above the breathable membrane frame can allow the water on the waterproof breathable membrane to be quickly drained after the vehicle wades.

[0059] When the transmission is in a wading condition and is in the exhaust process, since the internal pressure is greater than the external pressure, the internal gas is continuously discharged and the external water cannot enter the transmission through the exhaust channel.

[0060] When the transmission is wading and under internal negative pressure, even if the air intake channel is opened, water cannot pass through the waterproof breathable membrane due to the obstruction of the waterproof breathable membrane, and only gas can pass through, ensuring the waterproof effect under the air intake condition. The top of the breathable membrane skeleton has a conical surface, which can ensure that the water above the breathable membrane can be quickly discharged.

[0061] The main function of the vent plug cover is to envelop the overall structure, with only a small space at the bottom, which can prevent a large amount of water and external dust and sand from entering the interior, causing blockage of related channels and waterproof breathable membranes.

[0062] In summary, the new waterproof vent plug of this embodiment can realize two-way ventilation of the transmission case, is waterproof and dustproof, and ensures that the waterproof structure is not affected by oil and gas, thereby ensuring good durability.

[0063] Example 2

[0064] This embodiment provides a car, including the waterproof vent plug described in Embodiment 1.

[0065] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, a variety of simple modifications can be made to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

[0066] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0067] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A waterproof vent plug, characterized in that: The invention comprises a valve seat (1), a valve core assembly (2), an exhaust spring (3), a breathable membrane frame (4), a waterproof breathable membrane (5) and a breathable plug cover (6); the upper part of the valve seat (1) is fixedly and sealedly connected to the lower part of the breathable membrane frame (4) to form an internal hollow structure, the valve core assembly (2) and the exhaust spring (3) are located in the internal hollow structure, the exhaust spring (3) is located at the top of the valve core assembly (2), the valve core assembly (2) can slide in the internal hollow structure, and the exhaust spring (3) provides spring force for the movement of the valve core assembly (2); a breathable membrane mounting hole is provided above the breathable membrane frame (4) for mounting the waterproof breathable membrane (5), the breathable plug cover (6) is mounted above the breathable membrane frame (4) and envelops the above structure, and the inner top surface of the breathable plug cover (6) is rigidly fixedly connected to a plurality of top columns on the breathable membrane frame (4).

2. A waterproof vent plug according to claim 1, characterized in that: The upper part of the valve seat (1) and the lower part of the air-permeable membrane frame (4) are connected by welding, bonding or interference fit.

3. A waterproof vent plug as claimed in claim 1, characterized in that: The valve seat (1) is cylindrical and is formed by connecting a mounting outer circle (1-1) and a valve core matching surface (1-3) via a limit surface. The mounting outer circle (1-1) is used to match with a transmission case. The interior of the mounting outer circle (1-1) is a main ventilation channel (1-2). The valve core matching surface (1-3) is provided with a plurality of valve seat ventilation holes (1-4) connected to the outer wall.

4. A waterproof vent plug as claimed in claim 1, characterized in that: The valve core assembly (2) is composed of a valve core (2-1), a valve core cover plate (2-2), an air intake core body (2-3) and an air intake spring (2-4); the valve core cover plate (2-2) is rigidly connected to the valve core (2-1), and the formed internal closed structure is provided with an air intake core body (2-3) and an air intake spring (2-4); a connecting guide rod of the air intake core body (2-3) is inserted into the bottom of the exhaust seat (2-1-4) of the valve core (2-1); the air intake spring (2-4) is sleeved on the air intake core body (2-3), and the air intake core body (2-3) is pressed against the valve core cover plate (2-2) by the spring force, thereby sealing the air intake channel (2-2-2) on the valve core cover plate (2-2).

5. A waterproof vent plug as claimed in claim 4, characterized in that: The valve core (2-1) is cylindrical and comprises an outer wall (2-1-1), a cylindrical exhaust seat (2-1-4) nested therein and a valve core ventilation channel (2-1-2) enveloping the interior; a plurality of ventilation holes (2-1-3) are provided on the outer wall (2-1-1), a plurality of ventilation channels (2-1-5) are provided on the exhaust seat (2-1-4), and the ventilation channels (2-1-5) are used to connect the interior of the exhaust seat (2-1-4) with the valve core ventilation channel (2-1-2); an inner circular hole (2-1-6) is also provided above the exhaust seat (2-1-4) for matching and connecting with the outer circular surface (2-2-1) of the valve core cover plate (2-2), and a supporting hole (2-1-7) is provided below the exhaust seat (2-1-4) for matching with the connecting guide rod of the intake core (2-3).

6. A waterproof vent plug as claimed in claim 4, characterized in that: The valve core cover plate (2-2) is a circular cover plate having an outer circular surface (2-2-1), and an air intake channel (2-2-2) is provided on the top of the outer circular surface (2-2-1).

7. A waterproof vent plug as claimed in claim 4, characterized in that: The upper part of the air intake core (2-3) is a sheet body, and the lower part is rigidly connected to a connecting guide rod.

8. A waterproof vent plug as claimed in claim 1, characterized in that: The breathable membrane skeleton (4) is in the shape of a cylinder as a whole, with a conical surface (4-1) on the top, a breathable membrane mounting hole (4-2) is arranged at the top of the conical surface (4-1), a plurality of top columns (4-3) are evenly arranged around the outer side of the conical surface (4-1), and a plurality of shielding ribs (4-4) are arranged on the outer circumferential surface of the breathable membrane skeleton (4).

9. A waterproof vent plug as claimed in claim 1, characterized in that: The waterproof breathable membrane (5) is a disc-type PTFE waterproof head breathable membrane, which has the characteristics of ventilation and hydrophobicity, that is, air can pass through, but water and dust cannot pass through; The vent plug cover (6) is a cylindrical structure with an open bottom.

10. An automobile, characterized in that: It comprises a waterproof vent plug as described in any one of claims 1 to 9.

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