CN218564502U

CN218564502U - Waterproof vent valve of power transmission system

Info

Publication number: CN218564502U
Application number: CN202222580765.XU
Authority: CN
Inventors: 魏太演; 张文飞; 张贻深; 林井祥; 熊勇
Original assignee: Spider Xiamen S&t Co ltd
Current assignee: Spider Xiamen S&t Co ltd
Priority date: 2022-09-27
Filing date: 2022-09-27
Publication date: 2023-03-03
Anticipated expiration: 2032-09-27

Abstract

The utility model relates to a ventilation valve field discloses a power transmission system's waterproof ventilation valve, including upper cover, main body cover, ventilated membrane and prefilter. The middle of the main body shell is provided with a through cavity, the upper end side face of the main body shell is provided with a plurality of air holes, the upper cover is arranged on the upper end face of the main body shell, the breathable film and the prefilter are arranged inside the main body shell in a sealing mode, the breathable film is located below the air holes, and the prefilter is located below the breathable film. The utility model discloses a ventilated membrane and prefilter design that combines together, the ventilated membrane can prevent the invasion and the inside and the surrounding pressure differential of balanced sealed shell of pollutants such as water, dirt and piece. The prefilter has the effect of filtering oil mist, and can prevent the breathable film from frequently contacting with lubricating oil and condensing to form an 'oil film' on the breathable film, so that the use of the breathable film is influenced. Not only can guarantee that power transmission system is waterproof ventilative, but also increase of service life and reinforcing result of use.

Description

Waterproof ventilation valve of power transmission system

Technical Field

The utility model belongs to the technical field of the ventilation valve and specifically relates to a power transmission system's waterproof ventilation valve.

Background

The drivetrain is the core power source for the vehicle. Generally comprising: axle, transmission and power transfer cases, which are subject to rapid differential pressure changes, subject the seals and gaskets of their protective housings to positive and negative stresses. Therefore, these housings must exchange air with the surrounding environment in a manner that quickly balances the pressure differential between the inside and outside while preventing the ingress of contaminants such as water (liquid water), dirt, and debris that can damage the lubricant and corrode critical metal parts.

The traditional waterproof and breathable method for the power transmission system is to pass a rubber or plastic vent pipe through the component to a height higher than the height of the wading pipe and install a shaking cover at the end of the pipe. This semi-enclosed duct design functions like a snorkel, allowing air to enter and exit. The main drawback of this solution is the long piping and the complex installation method. If the duct vents are improperly covered, oily suspensions can accumulate on the exit and nearby surfaces, leaving objectionable water droplets on the garage floor and parking lot.

Another way is to open the holes directly, which, although the parts are permeable, does not avoid the gearbox from being flooded in extreme cases. Once the gearbox is filled with water, irreversible damage can be caused, and the damage is a serious accident.

The scheme that at present widely adopts on the market adds the check valve on power transmission system, and the benefit of this scheme can effectively relieve pressure when part inside temperature risees, but can form very big negative pressure when the part cooling, and this kind of stress will be used to the sealing material. In addition, because the check valve belongs to mechanical structure, therefore the protection level hardly reaches the car rule level requirement.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to solve prior art's problem, provide a power transmission system's waterproof breather valve, not only can prevent the invasion of pollutants such as water (liquid water), dirt and piece, the inside and pressure differential on every side of balanced seal shell simultaneously.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model discloses a power transmission system's waterproof breather valve, it includes upper cover, main body cover, ventilated membrane and prefilter. The middle of the main body shell is provided with a through cavity, the upper end side of the main body shell is provided with a plurality of air holes, the upper cover is arranged on the upper end face of the main body shell, the air permeable membrane and the prefilter are arranged inside the main body shell in a sealing mode, the air permeable membrane is located below the air holes, and the prefilter is located below the air permeable membrane.

The main functions of the gas permeable membrane are on the one hand to prevent the ingress of contaminants such as water (liquid water), dirt and debris and on the other hand to equalize the pressure difference inside and around the sealed enclosure. The below of ventilated membrane sets up the prefilter, and the prefilter has the effect of filtering oil mist, on the one hand, can prevent that the ventilated membrane from frequently contacting lubricating oil, and on the other hand, can prevent that the oil mist from condensing on the ventilated membrane and forming "oil film" to reduce the ventilative volume of ventilated membrane, lead to balanced pressure's functional failure.

Further, the air permeability of the breathable film is 200-1000 ml/cm2/min @70mbar, and the protection grade is IP68 or IP69K.

Further, the gas permeable membrane comprises a PTFE porous gas permeable membrane layer and a support material layer. The breathable film is of a three-layer structure of a PTFE porous breathable film layer, a support material layer and a PTFE porous breathable film layer or of a double-layer structure of the PTFE porous breathable film layer and the support material layer. The layers can be compounded by adopting a hot pressing or dispensing mode. Preferably, hot-pressing compounding is adopted, and a double-layer structure is adopted.

Further, the air permeability of the PTFE porous air-permeable membrane layer is 300-500 ml/cm2/min @70mbar, and the protection grade is IP69K. The preparation process of the PTFE porous material can be prepared by the process method disclosed in the invention patent CN 110982203B. The PTFE porous waterproof breathable film needs to be subjected to 8-level oleophobic modification.

Further, the supporting material layer is one of polyester non-woven fabric, polypropylene square grid, nylon material, polyester taffeta fabric and taffeta fabric. Preferably, a polyester nonwoven fabric substrate having excellent aging resistance is used, and the thickness is 0.15 to 0.25mm.

Further, a support frame is arranged between the prefilter and the breathable film. The support frame plays a role in fixing and blocking the pre-filter on one hand; on the other hand, the overall texture of the breathable film is softer, so that the structure can play a good supporting role for the breathable film.

Furthermore, the prefilter is provided with three layers of filter media, namely a glass fiber filter material layer, a polyester fiber or polypropylene fiber ball layer and a glass fiber filter material layer from top to bottom. The glass fiber filter material layer has hydrophobic and oleophobic characteristics, can directly block lubricating oil, and has the effect of prefiltering. Polyester silk or polypropylene silk fibre ball layer have hydrophilic oleophobic effect, can effectively prevent the accumulation of oil mist, and simultaneously, it possesses the hydrophilicity, is favorable to getting rid of the trace amount of water molecules in the organic solvent, simultaneously, through inside normal stress, evaporates vapor to the power transmission system casing outside.

Furthermore, the upper cover is provided with a buckle, and the main body shell is provided with a clamping groove matched with the buckle. The structure of buckle push type is adopted, so that the upper cover can be quickly integrated to the upper end of the main body shell through assembly.

Further, the lower end of the main body shell is provided with an external thread for connecting with a power transmission system, and the thread type can be quickly screwed into a power transmission system component and occupies a small space. The upper end of the main body shell is provided with an outer hexagon convenient to lock. Facilitating quick twist-on securing of the breather valve assembly to the power steering system housing using a wrench. The sealing gasket is arranged at the upper end of the external thread, so that the connection sealing performance is improved.

Further, the lower end of the main body shell is arranged to be a reverse taper which is convenient for being tightly connected with a power transmission system. The inverted cone direct-inserting type structure is adopted, the existing direct connection of the traditional vent pipeline or the hose at the tail end of the hose is considered, and the structural transformation of a connecting part of power transmission system components is not needed. The design of back taper is adopted, helps inseparabler that the hose connection like this, prevents to drop.

The utility model discloses an useful part is:

the utility model discloses a ventilated membrane and prefilter design that combines together, the ventilated membrane can prevent the invasion of pollutants such as water, dirt and piece and the inside and pressure differential on every side of balanced sealed shell. The pre-filter has the effect of filtering oil mist, and can prevent the breathable film from frequently contacting lubricating oil and condensing to form an oil film on the breathable film to influence the use of the breathable film. Not only can guarantee that power transmission system is waterproof ventilative, but also increase of service life and reinforcing result of use.

Drawings

Fig. 1 is a schematic perspective view of the present embodiment.

Fig. 2 is an exploded view of the present embodiment.

Fig. 3 is a plan view of the present embodiment.

Fig. 4 isbase:Sub>A cross-sectional view taken atbase:Sub>A-base:Sub>A in fig. 3.

Description of the main component symbols:

1. an upper cover;

2. a main body shell 21, a cavity 22 and air holes;

3. 31, a PTFE porous breathable film layer, 32 and a support material layer;

4. a prefilter 41, a glass fiber filter material layer 42 and a fiber ball layer.

5. Sealing gaskets;

6. a support frame.

Detailed Description

In order to make those skilled in the art better understand the technical solution of the present invention, the present invention is further described in detail with reference to the accompanying drawings and specific embodiments.

As shown in fig. 1 to 4, the utility model discloses a waterproof breather valve of power transmission system, which comprises an upper cover 1, a main body housing 2, a breather membrane 3 and a prefilter 4.

A through cavity 21 is arranged in the middle of the main body shell 2, a plurality of air holes 22 are formed in the side face of the upper end of the main body shell 2, the upper cover 1 is arranged on the upper end face of the main body shell 2, the air-permeable membrane 3 and the pre-filter 4 are arranged inside the main body shell 2 in a sealing mode, the air-permeable membrane 3 is located below the air holes 22, and the pre-filter 4 is located below the air-permeable membrane 3.

The main function of the gas permeable membrane 3 is on the one hand to prevent the ingress of contaminants such as water (liquid water), dirt and debris and on the other hand to equalize the pressure difference inside and around the sealed enclosure. The prefilter 4 is arranged below the breathable film 3, and the prefilter 4 has an effect of filtering oil mist, so that on one hand, the breathable film 3 can be prevented from frequently contacting lubricating oil, and on the other hand, the oil mist can be prevented from condensing on the breathable film 3 to form an oil film, thereby reducing the breathable amount of the breathable film 3 and causing functional failure of pressure balance.

Wherein, the air permeability of the breathable film 3 is 200-1000 ml/cm2/min @70mbar, and the protection grade is IP68 or IP69K.

Specifically, the gas permeable membrane 3 includes a PTFE porous gas permeable membrane layer 31 and a support material layer 32. The air permeable membrane 3 is a three-layer structure of a PTFE porous air permeable membrane layer 31+ a supporting material layer 32+ a PTFE porous air permeable membrane layer 31 or a two-layer structure of the PTFE porous air permeable membrane layer 31+ the supporting material layer 32. The layers can be compounded by adopting a hot pressing or dispensing mode. Preferably, hot-pressing compounding is adopted, and a double-layer structure is adopted.

Specifically, the air permeability of the PTFE porous air permeable membrane layer 31 is 300-500 ml/cm2/min @70mbar, and the protection grade is IP69K. The preparation process of the PTFE porous material can be prepared by the process method disclosed in the invention patent CN 110982203B. The PTFE porous waterproof breathable film 3 needs to be subjected to 8-level oleophobic modification. (oleophobic test is carried out by the Association of textile chemists and textile dyeing chemists (AATCC) 118-1989, in which a liquid of known surface tension is applied to the surface of a membrane material and the wetting is observed, which is the process by which the liquid enters the structure of the membrane.)

Specifically, the support material layer 32 is one of polyester nonwoven fabric, polypropylene square grid fabric, nylon material, polyester taffeta fabric, and taffeta fabric. Preferably, a polyester nonwoven fabric substrate having excellent aging resistance is used, and the thickness is 0.15 to 0.25mm.

Wherein, a support frame 6 is also arranged between the prefilter 4 and the ventilated membrane 3. The support frame 6 plays a role in fixing and blocking the pre-filter 4; on the other hand, because the overall texture of the breathable film 3 is softer, the structure can play a good role in supporting the breathable film 3.

Specifically, the prefilter 4 is provided with three layers of filter media, which are, from top to bottom, a glass fiber filter material layer 41, a polyester fiber or polypropylene fiber ball layer 42, and a glass fiber filter material layer 41. The glass fiber filter material layer 41 has hydrophobic and oleophobic characteristics, can directly block lubricating oil, and has a pre-filtering effect. Polyester silk or polypropylene silk fiber ball layer 42 have hydrophilic oleophobic effect, can effectively prevent the accumulation of oil mist, and simultaneously, it possesses hydrophilicity, is favorable to getting rid of the little water molecules among the organic solvent, simultaneously, through inside normal stress, evaporates the vapor outside the power transmission system casing.

For the assembly is convenient, the upper cover 1 is provided with a buckle, and the main body shell 2 is provided with a clamping groove matched with the buckle. Adopt the structure of buckle push type, be convenient for upper cover 1 through the assembly integrated to main body cover 2 upper end fast.

The lower end of the main body case 2 may be provided in a screw type or a straight type for connection with the components of the power train.

The threaded connection can be screwed into the drivetrain component quickly and takes up little space. In order to match with the thread assembly, the upper end of the main body shell 2 is provided with an outer hexagon convenient for locking. Facilitating quick twist-on securing of the breather valve assembly to the power steering system housing using a wrench. The sealing gasket 5 is arranged at the upper end of the external thread, so that the connection sealing performance is improved.

The formula of cuting straightly adopts the back taper, and the back taper directly cuts straightly the formula structure and has compromise the lug connection of current traditional air duct or the terminal hose of hose, need not to carry out connecting portion to the drivetrain parts.

To sum up, the utility model discloses not only can guarantee that power transmission system is waterproof ventilative, but also increase of service life and reinforcing result of use.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention.

Claims

1. The utility model provides a waterproof ventilation valve of power transmission system which characterized in that: comprises an upper cover, a main body shell, a ventilated membrane and a prefilter; the improved air filter is characterized in that a through cavity is formed in the middle of the main body shell, a plurality of air holes are formed in the side face of the upper end of the main body shell, the upper cover is arranged on the upper end face of the main body shell, the air-permeable membrane and the pre-filter are arranged inside the main body shell in a sealing mode, the air-permeable membrane is located below the air holes, and the pre-filter is located below the air-permeable membrane.

2. The waterproof breather valve of a drivetrain according to claim 1, wherein: the air permeability of the breathable film is 200-1000 ml/cm2/min @70mbar, and the protection grade is IP68 or IP69K.

3. The waterproof breather valve of a drivetrain according to claim 2, wherein: the breathable film comprises a PTFE porous breathable film layer and a support material layer; the breathable film is of a three-layer structure of a PTFE porous breathable film layer, a support material layer and a PTFE porous breathable film layer or of a double-layer structure of the PTFE porous breathable film layer and the support material layer.

4. The drivetrain system waterproof vent valve according to claim 3, wherein: the air permeability of the PTFE porous air-permeable membrane layer is 300-500 ml/cm2/min @70mbar, and the protection grade is IP69K.

5. The waterproof breather valve of a drivetrain according to claim 3, wherein: the support material layer is one of polyester non-woven fabrics, polypropylene square grids, nylon materials, polyester taffeta fabrics and taffeta fabric.

6. The waterproof breather valve of a drivetrain according to claim 1, wherein: a support frame is also arranged between the prefilter and the breathable film.

7. The waterproof breather valve of a drivetrain according to claim 1, wherein: the prefilter is provided with three layers of filter media, namely a glass fiber filter material layer, a polyester fiber or polypropylene fiber ball layer and a glass fiber filter material layer from top to bottom in sequence.

8. The waterproof breather valve of a drivetrain according to claim 1, wherein: the upper cover is provided with a buckle, and the main body shell is provided with a clamping groove matched with the buckle.

9. The waterproof breather valve of a drivetrain according to claim 1, wherein: the lower end of the main body shell is provided with an external thread used for being connected with a power transmission system, the upper end of the main body shell is provided with an outer hexagonal socket convenient to lock, and the upper end of the external thread is provided with a sealing gasket.

10. The waterproof breather valve of a drivetrain according to claim 1, wherein: the lower end of the main body shell is arranged to be a reverse taper which is convenient for being tightly connected with a power transmission system.