Waterproof and breathable valve

Abstract

The application provides a waterproof and breathable valve for waterproof and breathable of an automobile gearbox, which comprises a dustproof cap, a waterproof and breathable film and a joint body, wherein the waterproof and breathable film is arranged between the dustproof cap and the joint body; the dustproof cap comprises a cap cover part and a cap barrel part, and the cap barrel part comprises a radially protruding riveting ring; the joint body comprises a head body part and a threaded body part, the head body part comprises a dustproof wall, a head body ring, a riveting matching ring, a fixing ring and a head body bottom part, and the riveting ring is riveted to the riveting matching ring; the end face of the cap barrel part limits the waterproof and breathable film on the fixing ring; and an air passage is formed between the dustproof cap and the joint body. The waterproof and breathable valve balances the pressure difference between the inside and outside of the gearbox, ensures that the seal does not fail due to the pressure difference between the inside and outside exceeding the tolerance of the gearbox under normal working conditions when the external environment changes, and realizes the air intercommunication between the inside and outside of the gearbox.

Description

TECHNICAL FIELD

[0001] The present application relates to a breather valve, in particular to a waterproof breather valve for a gearbox of a vehicle. BACKGROUND

[0002] With the development of science and technology, the progress of technology, the automobile products are changing day by day, and various industrial products such as automobile parts have become more and more diverse. For batch production of products with different shapes and structures, product quality and production efficiency have higher requirements, among which higher requirements are also put forward for parts products. Automobile parts are an important field for China's automobile industry to participate in globalization. During driving, due to different altitudes in different regions, atmospheric pressure is also different, and heat generated during operation of the gearbox, which will cause imbalance of air pressure inside and outside the gearbox, resulting in pressure difference. The consequences of pressure difference will cause the gear oil in the gearbox to leak to the outside through some air valves, air pipes or joints on the gearbox, resulting in failure of the air valve and paralysis of the entire control system, and also causing pollution to the vehicle environment.

[0003] In order to solve this problem, the conventional method is to install an air plug on the gearbox, but the current air plug is a one-way valve, which can only prevent water and balance pressure in one direction, and cannot completely solve the oil leakage problem. In addition, in order to solve this problem, some methods are also used to use waterproof breather valves. The waterproof breather valve is a valve that can prevent water and oil, allow air to pass through, and balance pressure difference. For example, the waterproof and dustproof breather valve disclosed in patent No. 201821456151.8, but due to structural problems, the waterproof breather valve of the prior art is mostly used in good environments such as indoor and indoor. If used in outdoor, outdoor or vehicle chassis, there are often the following problems: 1. The internal and external pressure difference is out of balance, 2. The air permeability is not enough, causing local heat to be too high, 3. Rainwater enters, and 4. Short service life.

[0004] Therefore, in order to make up for the shortage of the prior art, it is of great significance to develop a waterproof breather valve for a gearbox to balance the air pressure inside and outside the gearbox. SUMMARY

[0005] In view of the above defects, the purpose of the present application is to provide a waterproof breather valve with simple and compact structure and stable performance, which prevents rainwater from entering the gearbox from the outside and prevents gear oil in the gearbox from flowing out from the inside, while having sufficient air permeability to solve the technical problems of the prior art.

[0006] To achieve the above purpose, the present application adopts the following technical solutions:

[0007] The application relates to a waterproof and breathable valve for waterproof and breathability of an automobile gearbox, which comprises a dustproof cap, a waterproof and breathable film and a joint body, wherein the waterproof and breathable film is arranged between the dustproof cap and the joint body; the dustproof cap comprises a cap cover part and a cap barrel part; the cap cover part is a cup-shaped body with an axially protruding cap rim on an outer edge; the cap barrel part is a barrel body; a plurality of air holes are formed in the barrel body of the cap barrel part; one end of the cap barrel part is connected with the cap cover part to form a groove; the other end of the cap barrel part comprises a radially protruding riveting ring; the joint body comprises a head body part and a threaded body part; the head body part comprises a dustproof wall, a head body ring, a riveting matching ring, a fixing ring and a head body bottom part which are sequentially connected; during assembly, the cap barrel part is inserted into the head body part, and the riveting ring is riveted to the riveting matching ring; the end surface of the cap barrel part limits the waterproof and breathable film on the fixing ring; and an air channel is formed between the dustproof cap and the joint body.

[0008] According to the waterproof and breathable valve, the outer diameter of the dustproof wall is smaller than the outer diameter of the head body ring, and the end surface of the dustproof wall is higher than the end surface of the cap rim in the horizontal position after assembly, so that the waterproof and dustproof functions are realized.

[0009] According to the waterproof and breathable valve, the cap barrel part further comprises a dustproof protruding ring which is radially protruded from the ring body of the cap barrel part and is used for dustproof.

[0010] According to the waterproof and breathable valve, the inner diameter of the head body ring is larger than the inner diameter of the riveting matching ring, and the inner diameter of the riveting matching ring is larger than the inner diameter of the fixing ring.

[0011] According to the waterproof and breathable valve, the waterproof and breathable valve further comprises a filter screen and a fixing sheet; the end surface of the threaded body part is provided with an annular fixing groove; and the fixing sheet is sleeved into the annular fixing groove to limit the filter screen.

[0012] The design idea of the application is to inherit the functions of the traditional breathable valve in principle and to require that the waterproof and breathable valve can always maintain the best performance in a harsh environment, so as to develop a waterproof and breathable valve for the gearbox, which can realize the functions of oil-proof, waterproof and dust-proof, prevent rainwater from entering the gearbox on the outside, prevent the gear oil in the gearbox from flowing out on the inside, and have sufficient breathability at the same time; and the waterproof and breathable valve can balance the air pressure inside and outside the gearbox. The above problems of the customers for the gearbox in many years are solved, the satisfaction of the customers is improved, and the core competitiveness of the product in the market is increased.

[0013] Due to the above technical features, the application has the following advantages and positive effects compared with the prior art.

[0014] First, the waterproof and breathable valve of the present application balances the pressure difference between the inside and outside of the gearbox, ensuring that the gearbox will not fail due to the pressure difference exceeding its tolerance when the external environment changes under normal operating conditions, and realizing air exchange between the inside and outside of the gearbox.

[0015] Second, the waterproof and breathable valve of the present application prevents external water, water vapor or other salt mist particles from entering the gearbox, ensuring the service life of the gearbox.

[0016] Third, the waterproof and breathable valve of the present application is connected by metal threads, which is strong and reliable.

[0017] Fourth, the air permeability of the waterproof and breathable valve of the present application can be customized according to requirements by selecting air permeable membranes with different air permeability or adjusting the effective area of the air permeable membrane, which has wider applicability.

[0018] Of course, implementing any one of the specific embodiments of the present application does not necessarily have all the above technical effects at the same time. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a schematic view of the appearance of the waterproof and breathable valve of the present application;

[0020] Figure 2 is a right side view of Figure 1 ;

[0021] Figure 3 is a schematic view of the dust cap of the present application;

[0022] Figure 4 is a schematic view of the joint body of the present application;

[0023] Figure 5 is a schematic view of the air path of the present application. DETAILED DESCRIPTION

[0024] The following describes several preferred embodiments of the present application in detail in conjunction with the accompanying drawings, but the present application is not limited to only these embodiments. The present application encompasses any substitutions, modifications, equivalent methods and solutions made to the essence and scope of the present application. In order for the public to have a thorough understanding of the present application, specific details are described in the following preferred embodiments of the present application, and the present application can also be fully understood without these details by those skilled in the art. In addition, in order to avoid unnecessary confusion of the essence of the present application, well-known methods, processes, procedures, elements, etc. are not described in detail.

[0025] Please refer to Figure 1 and Figure 2It is the appearance schematic diagram and right side cut open schematic diagram of the waterproof and breathable valve of the application, the waterproof and breathable valve of the application is used for waterproof and breathable of the automobile gearbox, the waterproof and breathable valve comprises a dustproof cap 1, a waterproof and breathable film 2 and a joint body 3, the waterproof and breathable film 2 is arranged between the dustproof cap 1 and the joint body 3, and the main function is to balance the pressure difference between the inside and outside of the gearbox, ensure that the gearbox does not cause sealing failure due to the pressure difference between the inside and outside exceeding its tolerance capacity when the external environment changes under normal working conditions, realize the air intercommunication between the inside and outside of the gearbox, and prevent the external water, water vapor or other salt mist particles from entering the inside of the gearbox.In addition, in terms of material, the dustproof cap 1 and the joint body 3 adopt aluminum alloy or copper alloy as the main material, the material is resistant to high and low temperature, is not affected by the environmental temperature, is manufactured from the material meeting the ROSH environmental protection requirement, meets the automobile banned substance and environmental protection requirement, and the use temperature range is-40 DEG C to +135 DEG C.

[0026] Among them, the dustproof cap 1 comprises a cap cover part 11 and a cap barrel part 12, as shown in the figure, the cap barrel part 12 is arranged in the middle of the cap cover part 11, and the cap cover part 11 and the cap barrel part 12 are concentric. Figure 2 Figure 2 And Figure 3 Among them, the cap cover part 11 is a cup-shaped body with an outer edge comprising an axially protruding cap rim 111, the cap barrel part 12 is a barrel body, a plurality of air holes 121 are formed on the barrel body of the cap barrel part 12, in the embodiment of the application, the number of the air holes 121 is four, but it cannot be used to limit the application, and more or fewer as long as it can meet the air requirement should be the protection scope of the application, one end of the cap barrel part 12 is connected with the cap cover part 11 to form a groove 122, the other end of the cap barrel part 12 comprises a radially protruding riveting ring 123, that is, the riveting ring 123 is a ring-shaped body protruding from the cap barrel part 12, Figure 2 The upper end surface of the riveting ring 123 and the cap barrel part 12 form a stepped plane, the stepped plane leaves space for the air path on the upper side, and also allows dust and moisture to stay, the cap cover part 11 and the cap barrel part 12 are integrally formed.

[0027] Figure 2 And Figure 4 ​In the middle, the joint body 3 is the main part of the whole waterproof and breathable valve, the bottom is a threaded structure, which can be customized according to the requirements of the thread size, the middle part is a hexagonal structure, which is convenient for using a wrench tool to tighten the thread, the joint body 3 includes a head body part and a threaded body part 32, the joint body 3 and the gearbox are connected with metal threads, which is strong in connection strength, the head body part includes a dustproof wall 311, a head body ring 312, a riveting cooperation ring 313, a fixed ring 314 and a head body bottom 315, the dustproof wall 311, the head body ring 312, the riveting cooperation ring 313, the fixed ring 314 and the head body bottom 315 are connected in sequence; the head body part and the threaded body part 32 are integrally formed.

[0028] When assembling, the cap cylinder part 12 is inserted into the connection of the head body part, the riveting ring 123 is riveted to connect the riveting cooperation ring 313, and the connection of the two belongs to interference fit connection; the end face of the cap cylinder part 12 limits the waterproof and breathable film 2 on the fixed ring 314; as Figure 5 As shown in the gas path schematic diagram of the application, the arrow points to the gas flow direction, the dustproof cap 1 and the joint body 3 form a gas path, the high-pressure gas in the gearbox enters the head body part from the threaded body part 32, passes through the waterproof and breathable film 2 to the cap cylinder part 12, then passes through the plurality of air holes 121 to enter the passage between the cap cylinder part 12 and the head body part, and continues to move to cross the dustproof wall 311 at the groove 122 to flow out of the waterproof and breathable valve from the gap between the cap edge 111 and the head body ring 312.

[0029] As shown in Figure 2 and Figure 4 The outer diameter of the dustproof wall 311 is smaller than the outer diameter of the head body ring 312 to form a step on the end face of the head body ring 312, after assembly, the end face of the dustproof wall 311 is higher than the end face of the cap edge 111, that is Figure 2 In the middle, the end face of the dustproof wall 311 is located in the groove 122, and the height difference forms a gas path turning, which can also be called a labyrinth structure, which is used for air circulation, waterproof and dustproof.

[0030] Please refer to Figure 2 and Figure 3The cap barrel part 12 further comprises a dustproof convex ring 124, which is a ring body protruding radially from the cap barrel part 12, and can also be said to form a convex platform in the air path for dust prevention. The dustproof wall 311 of the joint body 3 and the groove 122 of the dustproof cap 1 form a labyrinth channel, and the inner wall of the joint body 3 and the dustproof convex ring 124 and the air vent hole 121 of the dustproof cap 1 form another labyrinth channel. These labyrinth channels serve to circulate air and block dust, and the waterproof level reaches IP68, the water pressure resistance is 60KPa / 60s without leakage, and in addition, the oil pressure resistance is 35KPa / 60s without leakage. After assembly, the inner cavity of the dustproof cap 1 and the inner cavity of the joint body 3 form an air storage cavity. When the pressure inside and outside the gearbox is out of balance, the air outside the gearbox needs to enter the valve body again through the labyrinth channel, so the air in the air storage cavity is used first to alleviate the impact of pressure difference.

[0031] Figure 2 In the present application, the inner diameter of the head body ring 312 is greater than the inner diameter of the riveting matching ring 313, which facilitates the formation of a gap in the fall between the inner wall of the head body ring 312 and the inner wall of the riveting matching ring 313 after assembly, that is, the air path; the inner diameter of the riveting matching ring 313 is greater than the inner diameter of the fixed ring 314, and the upper end surface of the fixed ring 314 forms a platform, and the outer ring of the waterproof and breathable membrane 2 is placed on this platform, so that the waterproof and breathable membrane 2 can be fixed and limited in place during the riveting of the dustproof cap 1 and the joint body 3; the waterproof and breathable membrane 2 of the present application is made of a high-molecular waterproof material, which is made of a flexible and elastic microporous material-polytetrafluoroethylene (e-ptfe) through a special process. The advantages are high porosity, uniform pore size distribution, air permeability, small friction coefficient, and small adsorption. It also has certain dustproof performance, oil and water repellency, and thermal stability, resistance to chemical medium corrosion, uv resistance, etc. Even if there is a little dust and water vapor, the internal breathable membrane can further prevent dust and water. The air permeability of the waterproof and breathable valve of the present application is ≥12L / min at 7kPa air pressure. The air permeability can be customized by selecting a breathable membrane with different air permeability or adjusting the effective area of the breathable membrane according to the requirements.

[0032] As shown in Figure 2 The waterproof and breathable valve further comprises a filter screen 4 and a fixed sheet 5. The end surface of the threaded body part 32 is provided with an annular fixed groove, and the fixed sheet 5 is sleeved into the annular fixed groove to limit the filter screen 4. The filter screen 4 is a metal filter screen, which serves to relieve the impact of the oil pressure inside the gearbox and prevent the reverse entry of contaminants, oil sludge, dirt, etc. into the valve, allowing only air pressure to pass through. The fixed sheet 5 is used to fix the filter screen 4 to prevent it from falling off.

[0033] In summary, the waterproof and breathable valve of the present application realizes the dustproof effect under the premise of ensuring the exhaust capacity, improves the reliability of the product, and does not affect the appearance and normal assembly and use of the product; the waterproof and dustproof principle of the waterproof and breathable valve of the present application is that the first layer of waterproof and dustproof is realized by the dustproof cap 1 of the labyrinth structure, which blocks the moisture and dust from the outside. The second layer of waterproof and dustproof is realized by the waterproof and breathable membrane 2, and the micropore characteristics of the breathable membrane can block water vapor, dust and the like with a molecular size larger than that of air, preventing them from entering the gearbox. In addition, the principle of air permeability is that when the external environment changes (such as changes in temperature, altitude, etc.), a pressure difference will be generated in the gearbox, and when the internal pressure is higher than the external pressure, the excess air pressure in the gearbox will be discharged to the outside along the path of the arrow shown in the figure until the internal and external pressures are balanced; when the internal pressure is lower than the external pressure, the external air pressure will compensate the air pressure in the inside along the path of the arrow shown in the figure in the opposite direction until the internal and external pressures are balanced. Figure 5 Figure 5

[0034] It should be noted that in the description of the embodiments of the present application, the terms "front, back, left, right, up, down" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. The terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0035] In summary, due to the adoption of the above technical features, the present application has the following advantages and positive effects compared with the prior art:

[0036] Firstly, the waterproof and breathable valve of the present application balances the pressure difference between the inside and outside of the gearbox, ensures that the gearbox will not fail due to the pressure difference exceeding its tolerance when the external environment changes under normal working conditions, and realizes the air exchange between the inside and outside of the gearbox;

[0037] Secondly, the waterproof and breathable valve of the present application prevents external water, water vapor or other salt mist particles from entering the inside of the gearbox, and ensures the service life of the gearbox;

[0038] Thirdly, the waterproof and breathable valve of the present application is assembled and connected by metal threads, which is strong and reliable;

[0039] Fourthly, the air permeability of the waterproof and breathable valve of the present application can be customized according to the requirements by selecting breathable membranes with different air permeability or adjusting the effective area of the breathable membrane, which has wider applicability. ​​

[0040] The preferred embodiments of the application are merely illustrative of the principles of the application. The preferred embodiments do not limit the application to the precise details and conditions described. Obviously, many modifications and variations are possible in light of the above teachings. It is therefore to be understood that within the scope of the appended claims and their equivalents, the application can be practiced otherwise than as specifically described. The above disclosure is presented only for the purpose of illustrating preferred embodiments of the application and not for a purpose of limiting the same with the true scope of the application being indicated by the appended claims and their equivalents.

Claims

1. A waterproof breather valve for waterproof breather of an automobile transmission, characterized by, The waterproof and breathable valve comprises a dustproof cap, a waterproof and breathable film and a joint body, the waterproof and breathable film is arranged between the dustproof cap and the joint body, wherein, The dustproof cap comprises a cap cover part and a cap barrel part, the cap cover part is a cup-shaped body with an axially protruding cap rim on an outer edge, the cap barrel part is a barrel, a plurality of air holes are formed on the barrel of the cap barrel part, one end of the cap barrel part is connected with the cap cover part to form a groove, the other end of the cap barrel part comprises a radially protruding riveting ring; The joint body comprises a head body part and a threaded body part, the head body part comprises a dustproof wall, a head body ring, a riveting matching ring, a fixing ring and a head body bottom, the dustproof wall, the head body ring, the riveting matching ring, the fixing ring and the head body bottom are sequentially connected; During assembly, the cap barrel part is inserted into the head body part, the riveting ring is riveted to the riveting matching ring, the end surface of the cap barrel part limits the waterproof and breathable film on the fixing ring, and an air path is formed between the dustproof cap and the joint body; The outer diameter of the dustproof wall is smaller than the outer diameter of the head body ring, after assembly, the end surface of the dustproof wall is horizontally arranged at a position higher than the end surface of the cap rim, for waterproofing and dustproofing; The cap barrel part further comprises a dustproof protruding ring, the dustproof protruding ring is a ring body protruding radially from the cap barrel part, for dustproofing; The inner diameter of the head body ring is larger than the inner diameter of the riveting matching ring, and the inner diameter of the riveting matching ring is larger than the inner diameter of the fixing ring; The upper end surface of the riveting ring and the cap barrel part form a stepped plane.

2. The waterproof, breathable valve of claim 1, wherein The waterproof and breathable valve further comprises a filter screen and a fixing sheet, an annular fixing groove is formed on the end surface of the threaded body part, the fixing sheet is sleeved into the annular fixing groove to limit the filter screen.

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