Ventilation plug

Abstract

The utility model provides a ventilation plug, which is used for balancing air pressure inside and outside a vehicle box body, the ventilation plug comprises a dustproof cap, a waterproof breathable film, a spoiler and a joint body, the spoiler is arranged in a middle through hole of the joint body and is used for blocking oil, and the waterproof breathable film is arranged in the middle through hole of the joint body. The spoiler comprises a plurality of large cutting discs and a plurality of connecting columns for connecting two adjacent large cutting discs; the arc outer edge surfaces of the plurality of large cutting discs are tightly connected with the inner edge surface of the middle through hole of the joint body; and the vertical planes of the plurality of large cutting discs and the inner edge surface of the middle through hole of the joint body form a bent part of the passage. According to the ventilation plug, the function of balancing the internal and external pressure difference of a traditional ventilation plug can be guaranteed, and the good dustproof and waterproof effects are achieved.

Description

Technical Field

[0001] The present application relates to a ventilation device, and in particular to a ventilation plug on a housing shell of a vehicle, such as a reducer, a transmission, etc., which needs to maintain internal and external air pressure balance. Background Art

[0002] With the development of science and technology, the progress of technology, automobile products are changing with each passing day, and various industrial products such as automobile parts have become diverse. For the mass production of products with different shapes and structures, product quality and production efficiency have also been put forward higher requirements. Among them, higher requirements are also put forward for parts products, and automobile parts are an important field for my country's automobile industry to participate in globalization. The breather plug is a ventilation device used for commercial vehicle box parts. It is often used in the box shell of reducers, transmissions, etc. that need to maintain internal and external air pressure balance. For example, when the transmission is working, the temperature rises, causing the air in the box to expand and the pressure to increase, or the oil temperature in the box rises and gas is generated. If it is not discharged in time, it will affect the normal operation of the transmission. In order to prevent oil leakage from the seal of the transmission case and speed failure, the hot air in the box must be discharged from the breather plug to the outside of the box to maintain the pressure balance in the box.

[0003] The existing vent plug structure is composed of a joint body, a filter screen, and a protective cap. There are vent holes inside and around the joint body, and the filter screen is wrapped around the outer periphery of the vent holes around the joint body to prevent dust from entering. Although this structure can ensure the balance of the internal and external pressure differences, it has low filtering accuracy and poor waterproof performance, and there will be water leakage on rainy days and oil leakage when the internal oil temperature is high.

[0004] Therefore, in order to make up for the shortage of existing technology, it is of great significance to develop a breather plug with good performance to balance the internal and external air pressure of reducers and transmissions. Utility Model Content

[0005] In view of the above-mentioned defects, the purpose of the utility model is to provide a vent plug with simple and compact structure and stable performance, which is superior to the traditional vent plug in terms of structure and principle, so as to solve the technical problems of the prior art.

[0006] To achieve the above objectives, this application adopts the following technical solutions:

[0007] A vent plug is used to balance the internal and external air pressure of a vehicle box. The vent plug includes a dust cap, a waterproof breathable membrane, a spoiler and a joint body. The spoiler is arranged in the middle through hole of the joint body to block oil. The spoiler includes a plurality of large cut circular pieces and a plurality of connecting columns connecting two adjacent large cut circular pieces. The arc outer edge surfaces of the plurality of large cut circular pieces are in close contact with the inner edge surface of the middle through hole of the joint body; the vertical planes of the plurality of large cut circular pieces and the inner edge surface of the middle through hole of the joint body form a bend in the passage.

[0008] According to the vent plug described in the embodiment of the present application, the place where the inner edge surface of the joint body and the bottom surface of the baffle are connected includes a first step portion.

[0009] According to the vent plug described in the embodiment of the present application, the baffle plate also includes a plurality of arc-shaped connecting pieces connecting two adjacent large circular pieces for increasing the strength of the baffle plate, and the outer edge surfaces of the plurality of arc-shaped connecting pieces are in close contact with the inner edge surface of the middle through hole of the joint body.

[0010] According to the vent plug described in the embodiment of the present application, the vent plug also includes a fixing plate and a spacer sleeve, and the spacer sleeve, the waterproof breathable membrane, and the fixing plate are sequentially connected and arranged in the middle through hole of the joint body, and the upper end surface of the fixing plate protrudes from the upper end surface of the joint body; the place where the inner edge surface of the joint body and the spacer sleeve are connected includes a second step portion, and the spacer sleeve is a hollow annular body, and the end surface where the spacer sleeve and the second step portion are connected includes a radially inward spacer clamping ring portion, and the spacer clamping ring portion abuts against the upper surface of the large cut circular piece connected to the spoiler.

[0011] According to the vent plug described in the embodiment of the present application, the fixing plate is a hollow annular body, the outer wall of the fixing plate includes a radially protruding retaining ring, and the retaining ring is tightly connected to the inner edge surface of the middle through hole of the joint body; the dust cap is a cup-shaped body whose outer edge includes an axially protruding brim, the upper end surface of the fixing plate is connected to the cup bottom surface of the dust cap, and the upper end portion of the fixing plate is provided with at least two notch grooves for oil and gas passages.

[0012] According to the vent plug described in the embodiment of the present application, the outer surface of the upper end of the joint body includes a radially protruding rivet boss, and the rivet boss is clamped to the inner edge surface of the brim of the dust cap; the upper end of the joint body is provided with an axial groove corresponding to the position of the notch groove for the oil and gas passage.

[0013] According to the vent plug described in the embodiment of the present application, the lower end of the axial groove is connected to a radially protruding waterproof and dustproof boss, and there is a gap between the radial outer edge vertical surface of the waterproof and dustproof boss and the inner edge surface of the brim of the dust cap for the oil and gas passage.

[0014] The design idea of ​​the present application is to inherit the functions of the traditional breather plug in principle, and technically require to always maintain the best performance in harsh environments, and then develop a breather plug which is superior to the traditional breather plug in structure and principle. The breather plug of this structure can not only ensure the function of the traditional breather plug to balance the internal and external pressure difference, but also has a good dustproof and waterproof effect. At the same time, it can also prevent the internal gear wear materials from clogging the breather plug and prevent the internal gear oil from seeping out of the breather plug, so that the product performance is more reliable, the life is longer, and the cost is lower. It solves the above problems that customers have had with transmissions for many years, improves customer satisfaction, and increases the core competitiveness of the product in the market.

[0015] Due to the adoption of the above technical features, the utility model has the following advantages and positive effects compared with the prior art:

[0016] First, the vent plug of the present application can not only ensure the function of the traditional vent plug to balance the internal and external pressure difference, but also has a good dust and water proof effect;

[0017] Second, the vent plug of the present application can also prevent the wear material of the internal gear from clogging the vent valve and prevent the internal gear oil from seeping out of the vent plug, making the product performance more reliable, the service life longer, and the cost lower;

[0018] Third, the vent plug of the present application is connected by metal thread assembly, which is strong and reliable;

[0019] Fourthly, the air permeability of the vent plug of the present application can be customized according to demand by selecting waterproof and breathable membranes with different air permeability properties or adjusting the effective area of ​​the waterproof and breathable membrane, and has a wider applicability.

[0020] Of course, any specific embodiment of the present invention does not necessarily have all of the above technical effects at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the appearance of the vent plug of the present application;

[0022] Figure 2 yes Figure 1 A cross-sectional schematic diagram of

[0023] Figure 3 yes Figure 2 Schematic diagram of the deflection angle;

[0024] Figure 4 is a schematic cross-sectional view of the spoiler of the present application;

[0025] Figure 5 It is a schematic diagram of the spoiler of this application;

[0026] Figure 6 yes Figure 2 A partially enlarged schematic diagram of

[0027] Figure 7 It is a schematic diagram of the connector body of the present application;

[0028] Figure 8 It is a schematic diagram of the waterproof and breathable membrane of this application;

[0029] Fig. 9 It is a schematic diagram of the gas passage of the vent plug of the present application. DETAILED DESCRIPTION

[0030] For ease of understanding, preferred embodiments of the present invention are further described in detail below with reference to the accompanying drawings.

[0031] Please refer to Figure 1 Schematic diagram of the appearance of the vent plug of the present application. The vent plug of the present application can always maintain the best performance in harsh environments. It can not only ensure the function of traditional vent plugs to balance the internal and external pressure differences, but also has a good dust and water proof effect. At the same time, it can also prevent the internal gear wear materials from clogging the vent plug and prevent the internal gear oil from leaking out of the vent plug, making the product performance more reliable, the life longer, and the cost lower.

[0032] The vent plug of the present application is used to balance the internal and external air pressure of the vehicle box, and can balance the air pressure within the pressure difference of 200KPa, meeting the needs of all automotive parts, such as the box shell of the reducer, transmission, etc. that needs to maintain the internal and external air pressure balance. The vent plug includes a dust cap 10, a waterproof breathable membrane 20, a spoiler 30 and a joint body 40. The main function is to balance the internal and external pressure difference of the gearbox, ensure that the gearbox will not fail to seal due to the internal and external pressure difference exceeding its tolerance when the external environment changes under normal working conditions, realize the air communication between the inside and outside of the gearbox, and prevent external water, water vapor or other salt spray particles from entering the gearbox. The protection level can reach IP69K. In addition, in terms of material: the main body adopts copper alloy as the main material, which is resistant to high and low temperatures, not affected by ambient temperature, and is made of materials that meet ROSH environmental protection requirements, meeting the requirements of automobile banned substances and environmental protection; operating temperature range: -40℃~+135℃.

[0033] The waterproof and breathable membrane 20 is placed inside the connector body 40. Figure 8 The waterproof and breathable membrane 20 described in the invention is a polymer waterproof material, which is made of a flexible and elastic microporous material - polytetrafluoroethylene (e-ptfe) through a special process. It has the advantages of high porosity, uniform pore size distribution, air permeability, low friction coefficient, and extremely low adsorption. The pores of the waterproof and breathable membrane 20 described in the present application are very small, 0.02um-0.2um, and the porosity is more than 88%. At the same time, it has certain dustproof performance, oleophobic and hydrophobic properties, thermal stability, resistance to chemical corrosion, and UV resistance. Even if there is fine dust and water vapor infiltrating, the internal breathable membrane can further prevent dust and water.

[0034] Please refer to Figure 2 , Figure 3 , Figure 4 and Figure 5 The baffle plate 30 is arranged in the middle through hole of the connector body 40 to block the oil. Figure 4In the embodiment, the spoiler 30 includes a plurality of large cut circular pieces 31 and a plurality of connecting posts 32 connecting two adjacent large cut circular pieces. The so-called large cut circle is a portion larger than a semicircle left after a circle is cut. The arc outer edge surfaces 311 of the plurality of large cut circular pieces 31 are in close contact with the inner edge surface of the middle through hole of the joint body 40; the vertical planes 312 of the plurality of large cut circular pieces 31 and the inner edge surface of the middle through hole of the joint body 40 form a bend in the passage. Figure 2 The place where the inner edge surface of the joint body 40 and the bottom surface of the spoiler 30 are connected includes a first step portion 41. Fig. 9 As shown, the path of the arrow is the flow direction of the oil or oil gas. When flowing through the spoiler 30, the flow direction of the oil or oil gas forms a maze-like path. Therefore, the spoiler 30 of the present application is a maze-type spoiler.

[0035] like Figure 5 As shown, in another embodiment of the present application, the spoiler 30 also includes a plurality of arc-shaped connecting pieces connecting two adjacent large circular pieces for increasing the strength of the spoiler, and the outer edge surfaces of the plurality of arc-shaped connecting pieces are in close contact with the inner edge surface of the middle through hole of the joint body.

[0036] like Figure 6 As shown, the vent plug also includes a fixing plate 50 and a spacer sleeve 60, and the spacer sleeve 60, the waterproof breathable membrane 20, and the fixing plate 50 are sequentially connected and arranged in the middle through hole of the joint body 40, and are at the upper end of the joint body 40, and the upper end surface of the fixing plate 50 protrudes from the upper end surface of the joint body 40; the place where the inner edge surface of the joint body 40 and the spacer sleeve 60 are connected includes a second step portion 42, and the spacer sleeve 60 is a hollow annular body, and the end surface where the spacer sleeve 60 and the second step portion 42 are connected includes a radially inward spacer clamping ring portion 61, and the spacer clamping ring portion 61 abuts against the upper surface of the large cut circular piece 31 connected to the spoiler 30. In the embodiment of the present application, the spacer clamping ring portion 61 abuts against the outer ring portion connected to the large cut circular piece 31 to clamp the spoiler 30.

[0037] Figure 6In the embodiment, the fixing plate 50 is a hollow annular body, and the outer wall of the fixing plate 50 includes a radially protruding clamping convex ring 51, and the clamping convex ring 51 is closely connected to the inner edge surface of the middle through hole of the joint body 40, and the clamping convex ring 51 and the joint body 40 are connected by interference fit to clamp the waterproof breathable membrane 20 and the spacer sleeve 60; the dust cap 10 is a cup-shaped body whose outer edge includes an axially protruding brim, and the upper end face of the fixing plate 50 is connected to the cup bottom surface of the dust cap 10. In the embodiment of the present application, the upper end face of the fixing plate 50 and the cup bottom surface of the dust cap 10 form a seal, and the upper end portion of the fixing plate 50 is provided with at least two notch grooves 52 for oil and gas passages, and the upper end face of the fixing plate 50 cannot be ventilated, so the oil and gas can only flow out from the notch grooves 52.

[0038] The waterproof breathable membrane 20 is assembled as follows: the waterproof breathable membrane 20 is placed on the spacer 60, and then riveted by the fixing plate 50. Figure 6 As shown, the function of the spacer 60 is as follows: the upper part is used to support the waterproof breathable membrane 20 so that the waterproof breathable membrane 20 has better air circulation and must be placed away from air; the lower part is used to fix the labyrinth-shaped spoiler 30 in the joint body 40 to prevent loosening and displacement between parts.

[0039] Please refer to Figure 7 Schematic diagram of the connector body of the present application, the connector body 40 is the main part of the entire vent plug, the bottom is a threaded structure, the assembly adopts metal threaded connection, the strength is reliable, in addition, the thread size can be customized according to demand, the middle part is an external hexagonal structure, which is convenient for using a wrench tool to tighten the thread, the outer surface of the upper end of the connector body 40 includes a radially protruding riveted boss 43, the riveted boss 43 is clamped with the inner edge surface of the brim of the dust cap 10, specifically, the riveted boss 43 and the inner edge surface of the brim of the dust cap 10 are riveted to perform interference fit to fix the dust cap 10 and the connector body 40, and the dust cap 10 has the effect of waterproof, dustproof and high-pressure impact; the upper end of the connector body 40 corresponds to the position of the notch groove 52 to open an axial groove 44 for oil and gas passage, and the axial groove 44 is an air pressure balance channel. In the embodiment of the present application, the number of the axial grooves 44 is two, but it cannot be used to limit the present application, and multiple channels can be set according to the actual requirements for air permeability. The more the number, the greater the air permeability.

[0040] like Figure 7As shown, the lower end of the axial groove 44 is connected to a radially protruding waterproof and dustproof boss 45, and there is a gap between the radial outer edge vertical surface of the waterproof and dustproof boss 45 and the inner edge surface of the brim of the dust cap 10 for the oil and gas passage. The waterproof and dustproof boss 45 and the inner edge surface of the brim of the dust cap 10 are clearance-matched, and the gap is 0.2-0.3mm, which can prevent dust and dirt larger than 0.3mm from entering the box; the role of the waterproof and dustproof boss 45 is to reduce the size of the gas passage outlet, so as to play a role of waterproof, dustproof and breathable.

[0041] The functional principle of the vent plug in this application is described below:

[0042] 1. Waterproof and dustproof principle: The first layer of protection is achieved by the complex channel formed by the joint body 40 and the dust cap 10 after assembly, blocking high-pressure water, dust, debris, etc. from the outside. The second layer of protection is achieved by the waterproof breathable membrane 20. The microporous characteristics of the waterproof breathable membrane 20 can block water vapor and dust with molecules larger than air to prevent them from entering the box. The water resistance pressure is 60KPa / 60s without leakage.

[0043] 2. Ventilation principle: When the external environment changes (such as temperature, altitude, etc.), a pressure difference will occur inside the box. When the internal pressure is higher than the external pressure, the excess air pressure inside the box will Fig. 9 The path of the arrow shown in the figure is exhausted to the outside 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 internal pressure in the opposite direction of the arrow shown in the figure until the internal and external pressures are balanced.

[0044] 3. Oil-proof principle: In addition to being dustproof, waterproof and breathable, the vent plug of this application can also prevent oil from entering the interior, and the oil-resistant pressure is 35KPa / 60s without leakage. A baffle 30 is provided in the vent plug joint body 40, and the baffle 30 is a labyrinth structure. When the truck is driving in a bumpy manner, the gear oil in the box will shake and even splash onto the vent plug. At this time, the bottom plane of the vent plug baffle 30 can alleviate most of the impact of the oil pressure. Even if there is residual oil that continues to rush upward, there is a second layer of plane to alleviate it. There are a total of 4 layers of plane buffers. Even if there is still oil mist going up at the end, the last waterproof and breathable membrane 20 can completely block the oil mist. When the oil shakes, it will all flow back into the box under the action of gravity to prevent the oil mist from running out of the box and causing discomfort to the driver.

[0045] It should be noted that in the description of the embodiments of the present application, the terms "front, rear", "left, right", "up, down", etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present application. The terms "install", "connect", and "connected" 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 direct connection, or an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0046] Due to the adoption of the above technical features, the utility model has the following advantages and positive effects compared with the prior art:

[0047] First, the vent plug of the present application can not only ensure the function of the traditional vent plug to balance the internal and external pressure difference, but also has a good dust and water proof effect;

[0048] Second, the vent plug of the present application can also prevent the wear material of the internal gear from clogging the vent valve and prevent the internal gear oil from seeping out of the vent plug, making the product performance more reliable, the service life longer, and the cost lower;

[0049] Third, the vent plug of the present application is connected by metal thread assembly, which is strong and reliable;

[0050] Fourthly, the air permeability of the vent plug of the present application can be customized according to demand by selecting waterproof and breathable membranes with different air permeability properties or adjusting the effective area of ​​the waterproof and breathable membrane, and has a wider applicability.

[0051] Of course, any specific embodiment of the present invention does not necessarily have all the above technical effects at the same time. The above disclosure is only a preferred embodiment of the present invention, but it is not intended to limit itself. Any equivalent changes and modifications made by any technician familiar with the field without violating the spirit and connotation of the present invention should fall within the scope of protection of the present invention.

Claims

1. A vent plug used for balancing the internal and external air pressure of a vehicle box, characterized in that: The vent plug includes a dust cap, a waterproof breathable membrane, a baffle and a connector body, wherein the baffle is arranged in the middle through hole of the connector body to block the oil, wherein: The spoiler includes a plurality of large cut circular pieces and a plurality of connecting columns connecting two adjacent large cut circular pieces, the arc outer edge surfaces of the plurality of large cut circular pieces are in close contact with the inner edge surface of the middle through hole of the joint body; the vertical planes of the plurality of large cut circular pieces and the inner edge surface of the middle through hole of the joint body form a bend in the passage.

2. The vent plug according to claim 1, characterized in that: The place where the inner edge surface of the joint body and the bottom surface of the spoiler are connected includes a first step portion.

3. The vent plug according to claim 2, characterized in that: The spoiler also includes a plurality of arc-shaped connecting pieces connecting two adjacent large circular pieces for increasing the strength of the spoiler, and the outer edge surfaces of the plurality of arc-shaped connecting pieces are in close contact with the inner edge surface of the middle through hole of the joint body.

4. The vent plug according to claim 3, characterized in that: The vent plug also includes a fixing plate and a spacer sleeve. The spacer sleeve, waterproof breathable membrane, and fixing plate are sequentially connected and arranged in the middle through hole of the joint body. The upper end surface of the fixing plate protrudes from the upper end surface of the joint body. The place where the inner edge surface of the joint body and the spacer sleeve are connected includes a second step portion. The spacer sleeve is a hollow annular body. The end surface connecting the spacer sleeve and the second step portion includes a radially inward spacer collar portion, and the spacer collar portion abuts against the upper surface of the large cut circular piece connected to the spoiler.

5. The vent plug according to claim 4, characterized in that: The fixing plate is a hollow annular body, and the outer wall of the fixing plate includes a radially protruding snap ring, and the snap ring is tightly connected to the inner edge surface of the middle through hole of the joint body; the dust cap is a cup-shaped body whose outer edge includes an axially protruding brim, and the upper end surface of the fixing plate is connected to the cup bottom surface of the dust cap, and the upper end portion of the fixing plate is provided with at least two notch grooves for oil and gas passage.

6. The vent plug according to claim 5, characterized in that: The outer surface of the upper end of the joint body includes a radially protruding riveted boss, and the riveted boss is clamped with the inner edge surface of the brim of the dust cap; the upper end of the joint body is provided with an axial groove corresponding to the position of the notch groove for oil and gas passage.

7. The vent plug according to claim 6, characterized in that: The lower end of the axial groove is connected to a radially protruding waterproof and dustproof boss, and a gap exists between the radial outer edge vertical surface of the waterproof and dustproof boss and the inner edge surface of the brim of the dustproof cap for oil and gas passage.

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