Ventilation valve, speed reducer, drive axle assembly and vehicle

Abstract

The invention discloses a vent valve, a speed reducer, a drive axle assembly and a vehicle, the vent valve is used for the speed reducer, the speed reducer comprises a speed reducer shell, a mounting hole is formed in the speed reducer shell, the vent valve is suitable for being mounted in the mounting hole and used for communicating an inner cavity of the speed reducer shell with the external environment, and the vent valve comprises a valve body, a valve cover, a valve element and a spring; a channel suitable for being communicated with an inner cavity of a speed reducer shell is arranged in the valve body, a ventilation cavity is defined between the valve cover and the valve body, a first ventilation hole communicated with the ventilation cavity and the external environment is formed in the valve cover, and the valve element is movably arranged on the valve body so as to communicate or separate the channel and the ventilation cavity. According to the vent valve, when the pressure of the vent valve in the inner cavity of the speed reducer is too high, the position of the valve element can be automatically adjusted, the pressure of the inner cavity of the speed reducer and the pressure of the external environment are rapidly balanced, and therefore the possibility that the speed reducer loses efficacy due to the too high pressure in the inner cavity is reduced, and the service life of the speed reducer is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicles, and in particular to a vent valve, a reducer, a drive axle assembly and a vehicle. Background Art

[0002] In the related art, the transmission system of the vehicle often uses a gear structure for transmission, and the gear transmission system is lubricated by gear oil. However, during the operation of the vehicle, the temperature of the gear oil will continue to rise, causing the internal pressure of the reducer to be too high and fail, thus affecting the service life of the reducer. Therefore, there is room for improvement. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the present invention is to provide a vent valve, in which a valve core is movably arranged on a valve body to connect or block a passage and a vent cavity, so that when the pressure in the inner cavity of the reducer is too high, the vent valve can automatically adjust the position of the valve core, so that the pressure in the inner cavity of the reducer and the pressure of the external environment are quickly balanced, thereby reducing the possibility of failure of the reducer due to excessive pressure in the inner cavity, which is conducive to extending the service life of the reducer.

[0004] The present invention provides a reducer having the above-mentioned vent valve.

[0005] The invention provides a drive axle assembly having the above-mentioned reducer.

[0006] The present invention also provides a vehicle having the drive axle assembly.

[0007] According to the first aspect of the present invention, a vent valve is used for a reducer, the reducer includes a reducer housing, a mounting hole is formed on the reducer housing, the vent valve is suitable for being installed in the mounting hole and is used to connect the inner cavity of the reducer housing with the external environment, the vent valve includes: a valve body, the valve body has a passage suitable for connecting with the inner cavity of the reducer housing, the valve body has a first end and a second end, the first end of the valve body is suitable for being installed in the mounting hole; a valve cover, the valve cover is arranged on the second end of the valve body and is detachably connected to the valve cover, a vent cavity is defined between the valve cover and the valve body, a first vent hole connecting the vent cavity with the external environment is formed on the valve cover; a valve core, the valve core is movably arranged on the valve body to connect or isolate the passage and the vent cavity; a spring, the spring is located in the vent cavity, one end of the spring is connected to the valve core and the other end of the spring is connected to the valve cover, and the spring can be elastically deformed in the movement direction of the valve core.

[0008] According to the vent valve of the embodiment of the present invention, the valve core is movably arranged on the valve body to connect or isolate the channel and the vent cavity, so that when the pressure in the inner cavity of the reducer is too high, the vent valve can automatically adjust the position of the valve core, so that the pressure of the inner cavity of the reducer and the external environment are quickly balanced, thereby reducing the possibility of failure of the reducer due to excessive pressure in the inner cavity, which is beneficial to extending the service life of the reducer.

[0009] According to some embodiments of the present invention, a plurality of first ventilation holes are formed on a peripheral wall of the valve housing, and the plurality of first ventilation holes are arranged at intervals along the circumference of the valve housing.

[0010] According to some embodiments of the present invention, the channel extends in an up-down direction, the lower end of the valve body is suitable for being installed in the installation hole, and the valve cover is disposed on the upper end of the valve body.

[0011] According to some embodiments of the present invention, the first vent hole is formed at a lower end of the valve cover.

[0012] According to some embodiments of the present invention, the first vent hole is formed on a peripheral wall of the valve housing, and the first vent hole extends obliquely downward in a direction from the inside of the valve housing to the outside of the valve housing.

[0013] According to some embodiments of the present invention, a second air vent is formed on the peripheral wall of the valve body, the second air vent is used to connect the channel and the ventilation cavity, the valve core is arranged at the second end of the valve body and is at least partially accommodated in the channel to block the second end of the valve body, and the valve core is movable between a first position and a second position along the axial direction of the valve body; wherein, in the first position, the valve core closes the second air vent; and in the second position, the valve core opens the second air vent.

[0014] According to some embodiments of the present invention, there are a plurality of second vent holes, and the plurality of second vent holes are arranged at intervals along the circumference of the valve body.

[0015] According to some embodiments of the present invention, the second vent hole extends obliquely downward in a direction from the inside of the valve body to the outside of the valve body.

[0016] According to some embodiments of the present invention, the second vent hole and the first vent hole are staggered in a radial direction of the valve body.

[0017] According to some embodiments of the present invention, a first ventilation gap is defined between the outer circumferential wall of the valve core and the inner circumferential wall of the valve body, a sealing protrusion is provided on the outer circumferential wall of the valve core, the sealing protrusion is in sealing contact with the inner circumferential wall of the valve body, and the sealing protrusion is located on a side of the first ventilation gap away from the first end of the valve body; wherein, in the first position, the sealing protrusion is opposite to the second ventilation hole to close the second ventilation hole; and in the second position, the sealing protrusion is located on a side of the second ventilation hole away from the first end of the valve body to open the second ventilation hole.

[0018] According to some embodiments of the present invention, the sealing protrusion is a rubber block; and / or a mounting groove is formed on the outer peripheral wall of the valve core, and a portion of the rubber block is accommodated in the mounting groove.

[0019] According to some embodiments of the present invention, the outer peripheral wall of the valve core forms a limiting flange, and the limiting flange is located on the side of the valve body close to the spring. When in the first position, the limiting flange abuts against the axial end face of the valve body close to the spring.

[0020] According to some embodiments of the present invention, the valve core includes a valve core body and a sealing membrane, a third air vent is formed in the valve core body, the third air vent penetrates the valve core body along the axial direction of the valve core body and is used to connect the channel with the ventilation cavity, the sealing membrane is installed at the third air vent, the outer peripheral surface of the sealing membrane includes a first sealing surface, the inner peripheral wall of the third air vent includes a second sealing surface, the first sealing surface and the second sealing surface both extend obliquely in the direction from the second end of the valve body to the first end of the valve body toward the direction away from the central axis of the third air vent; wherein the sealing membrane has a first state and a second state, in the first state, the first sealing surface is sealed with the second sealing surface to close the third air vent, and in the second state, the first sealing surface is spaced apart from the second sealing surface to form a second ventilation gap.

[0021] According to some embodiments of the present invention, the sealing membrane comprises a fixing portion and a sealing portion, the fixing portion is connected to the valve core body and is located in the third vent hole, the sealing portion is connected to the fixing portion and is conical, and the outer peripheral surface of the sealing portion comprises the first sealing surface.

[0022] According to some embodiments of the present invention, the valve core includes a diaphragm fixing seat, which is located in the third ventilation hole and connected to the valve core body, and the outer peripheral wall of the diaphragm fixing seat and the inner peripheral wall of the third ventilation hole define a third ventilation gap, and the third ventilation gap is suitable for connecting to the second ventilation gap.

[0023] According to some embodiments of the present invention, the valve core further comprises a waterproof breathable membrane, wherein the waterproof breathable membrane is located in the third vent hole and on a side of the sealing membrane member away from the first end of the valve body.

[0024] According to some embodiments of the present invention, a first ventilation gap is defined between the outer circumferential wall of the valve core and the inner circumferential wall of the valve body, and a sealing protrusion is provided on the outer circumferential wall of the valve core, the sealing protrusion is in sealing contact with the inner circumferential wall of the valve body, and the sealing protrusion is located on a side of the first ventilation gap away from the first end of the valve body; wherein, in the first position, the sealing protrusion is opposite to the second ventilation hole to close the second ventilation hole; in the second position, the sealing protrusion is located on a side of the second ventilation hole away from the first end of the valve body to open the second ventilation hole; the sealing membrane also includes an oil-blocking flange, which is connected to the outer circumferential side of the first sealing surface, and in the first state, the oil-blocking flange is located on a side of the valve core body close to the first end of the valve body, and the side of the first ventilation gap facing the first end of the valve body is formed as a gap opening, and the oil-blocking flange covers a portion of the gap opening along the radial direction of the valve body.

[0025] The reducer according to the second aspect of the present invention comprises: the vent valve according to the first aspect of the present invention.

[0026] The reducer according to the embodiment of the present invention is provided with the above-mentioned vent valve, and the valve core of the vent valve is movably arranged on the valve body to connect or isolate the channel and the vent cavity, so that when the pressure in the inner cavity of the reducer is too high, the vent valve can automatically adjust the position of the valve core, so that the pressure of the inner cavity of the reducer and the external environment are quickly balanced, thereby reducing the possibility of failure of the reducer due to excessive pressure in the inner cavity, which is beneficial to extending the service life of the reducer.

[0027] According to some embodiments of the present invention, the valve body is detachably connected to the mounting hole.

[0028] The drive axle assembly according to the third aspect of the present invention comprises: a reducer according to the second aspect of the present invention.

[0029] According to the drive axle assembly of the embodiment of the present invention, the reducer is provided, and the reducer includes a vent valve, and the valve core of the vent valve is movably arranged on the valve body to connect or isolate the channel and the vent cavity, so that when the pressure in the inner cavity of the reducer is too high, the vent valve can automatically adjust the position of the valve core, so that the pressure of the inner cavity of the reducer and the external environment are quickly balanced, thereby reducing the possibility of failure of the reducer due to excessive pressure in the inner cavity, which is beneficial to extending the service life of the reducer.

[0030] A vehicle according to an embodiment of a fourth aspect of the present invention comprises: a drive axle assembly according to an embodiment of the third aspect of the present invention.

[0031] According to the vehicle of the embodiment of the present invention, the drive axle assembly is provided, the drive axle assembly includes a reducer, the reducer includes a vent valve, the valve core of the vent valve is movably arranged on the valve body to connect or isolate the channel and the vent cavity, so that when the pressure in the inner cavity of the reducer is too high, the vent valve can automatically adjust the position of the valve core, so that the pressure of the inner cavity of the reducer and the external environment are quickly balanced, thereby reducing the possibility of failure of the reducer due to excessive pressure in the inner cavity, which is beneficial to extending the service life of the reducer.

[0032] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0034] Figure 1 is a schematic diagram of a drive axle assembly according to some embodiments of the present invention;

[0035] Figure 2 yes Figure 1 The enlarged view of point A in the middle;

[0036] Figure 3 yes Figure 1 Cross-sectional view of the breather valve in the drive axle assembly.

[0037] Reference numerals:

[0038] 1a, drive axle assembly; 1, reducer; 11, reducer housing; 112, inner cavity;

[0039] 2. Ventilation valve; 21. Valve body; 211. Channel; 212. First end; 213. Second end; 214. Second vent hole; 23. Valve cover; 231. Ventilation cavity; 232. First vent hole; 24. Spring;

[0040] 25. Valve core; 251. First ventilation gap; 252. Sealing protrusion; 254. Limit flange; 255. Valve core body; 256. Sealing membrane; 257. Third ventilation hole; 258. First sealing surface; 259. Second sealing surface; 260. Fixing part; 261. Sealing part; 262. Diaphragm fixing seat; 263. Third ventilation gap; 264. Waterproof breathable membrane; 265. Oil retaining flange; 266. Gap opening. DETAILED DESCRIPTION

[0041] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0042] Reference below Figure 1-Figure 3 A vent valve 2 according to an embodiment of the present invention is described.

[0043] Reference Figure 1-Figure 3 , the vent valve 2 according to the embodiment of the first aspect of the present invention is used for a reducer 1, and the reducer 1 includes a reducer housing 11, and a mounting hole is formed on the reducer housing 11, and the vent valve 2 is suitable for being installed in the mounting hole and the vent valve 2 is used to connect the inner cavity 112 of the reducer housing 11 with the external environment. The mounting hole can facilitate the installation of the vent valve 2 on the reducer housing 11, and can make the overall structure of the vent valve 2 and the reducer 1 compact. The vent valve 2 connects the inner cavity 112 of the reducer 1 with the external environment, which is convenient for the gas exchange between the external environment and the inner cavity 112 of the reducer 1, and is conducive to quickly adjusting the pressure in the inner cavity 112 of the reducer 1; and the vent valve 2 can also play a role in dustproof and waterproof, and prevent moisture or dust from entering the inner cavity 112 of the reducer 1, thereby improving the reliability of the reducer 1 and extending the service life of the reducer 1.

[0044] The vent valve 2 includes a valve body 21, a valve cover 23, a valve core 25 and a spring 24. The valve body 21 has a passage 211 in communication with the inner cavity 112 of the reducer housing 11. The valve body 21 has a first end 212 and a second end 213. The first end 212 of the valve body 21 is suitable for being installed in the mounting hole. The valve cover 23 is covered at the second end 213 of the valve body 21. The valve body 21 and the valve cover 23 are detachably connected, which can facilitate the maintenance or replacement of the valve cover 23. A vent cavity 231 is defined between the valve cover 23 and the valve body 21. A first vent hole 232 is formed on the valve cover 23, which connects the vent cavity 231 with the external environment. The first vent hole 232 can facilitate the gas exchange between the external environment and the vent cavity 231, which is conducive to quickly adjusting the pressure in the vent cavity 231. The valve core 25 is movably disposed on the valve body 21 to connect or block the passage 211 and the ventilation cavity 231. The spring 24 is located in the ventilation cavity 231. One end of the spring 24 is connected to the valve core 25 and the other end of the spring 24 is connected to the valve cover 23. The spring 24 can be elastically deformed in the movement direction of the valve core 25. The spring 24 can provide a driving force to drive the valve core 25 to move. One end of the spring 24 is connected to the valve core 25 and one end of the spring 24 is connected to the valve cover 23. The valve cover 23 is relatively fixed to the valve body 21. When the spring 24 is in a compressed state, it can store energy, so that the other end of the spring 24 can apply an elastic restoring force to the valve core 25, so that the spring 24 can drive the valve core 25 to move.

[0045] For example, when the pressure in the inner cavity 112 of the reducer 1 is higher than the pressure in the external environment and reaches a certain difference, the pressure difference between the inner cavity 112 of the reducer 1 and the external environment can overcome the elastic force of the spring 24 to push the valve core 25 to move and compress the spring 24 along the movement direction of the valve core 25, so that the valve core 25 moves relative to the valve body 21 to the position of the connecting channel 211 and the ventilation cavity 231, so that the inner cavity 112 of the reducer 1 can be indirectly connected with the external environment, and the gas in the inner cavity 112 can be quickly discharged to the external environment, which helps to quickly reduce the pressure in the inner cavity 112 and quickly balance the pressure in the inner cavity 112 and the external environment, thereby reducing the possibility of failure of the reducer 1 due to excessive pressure in the inner cavity 112, which is beneficial to extend the service life of the reducer 1.

[0046] For another example, when the pressure difference between the inner cavity 112 of the reducer 1 and the external environment is relatively small and within a safe range, the spring 24 can drive the valve core 25 to move in time due to its own elastic restoring force so that the valve core 25 moves to a position that separates the channel 211 and the ventilation cavity 231, thereby reducing the possibility that dust or moisture in the external environment enters the inner cavity 112 of the reducer 1 through the ventilation cavity 231 and the channel 211 and damages the reducer 1.

[0047] According to the vent valve 2 of the embodiment of the present invention, the valve core 25 is movably arranged on the valve body 21 to connect or isolate the channel 211 and the vent cavity 231, so that when the pressure in the inner cavity 112 of the reducer 1 is too high, the vent valve 2 can automatically adjust the position of the valve core 25, so that the pressure of the inner cavity 112 of the reducer 1 and the external environment are quickly balanced, thereby reducing the possibility of the reducer 1 failing due to the excessively high pressure in the inner cavity 112, which is beneficial to prolonging the service life of the reducer 1.

[0048] Reference Figure 3 According to some embodiments of the present invention, the valve cover 23 is threadedly connected to the valve body 21, which can make the connection between the valve cover 23 and the valve body 21 simple and have strong stability, and can also facilitate the installation or removal of the valve cover 23 on the valve body 21.

[0049] Reference Figure 3 According to some embodiments of the present invention, a plurality of first vent holes 232 are formed on the peripheral wall of the valve cover 23. The plurality of first vent holes 232 are arranged at intervals along the circumference of the valve cover 23, which can increase the ventilation area of ​​the valve cover 23, thereby enhancing the effect of gas circulation at the valve cover 23.

[0050] In the description of the present invention, "plurality" means two or more.

[0051] Reference Figure 3According to some embodiments of the present invention, the channel 211 extends in the up-down direction, the lower end of the valve body 21 is suitable for being installed in the installation hole, and the valve cover 23 is covered on the upper end of the valve body 21. By utilizing the phenomenon that the gas in the channel 211 (for example, the high-temperature oil gas generated when the reducer 1 is working) automatically rises, the valve cover 23 is covered on the upper end of the valve body 21 and the first air vent 232 is formed on the peripheral wall of the valve cover 23. The exhaust efficiency of the gas discharged to the external environment through the first air vent 232 can be improved, and the pressure of the inner cavity 112 of the reducer 1 can be quickly reduced, so that the pressure of the inner cavity 112 of the reducer 1 is quickly balanced with that of the external environment, thereby reducing the possibility of the reducer 1 failing due to excessive pressure in the inner cavity 112.

[0052] Reference Figure 3 According to some embodiments of the present invention, a first vent hole 232 is formed at the lower end of the valve cover 23. By utilizing the downward force of the liquid's own gravity, the liquid in the vent cavity 231 can flow out through the first vent hole 232 at the lower end of the valve cover 23, thereby reducing the possibility of liquid accumulation in the vent cavity 231. It can also prevent the liquid in the vent cavity 231 from blocking the first vent hole 232, so that the gas can flow smoothly through the first vent hole 232.

[0053] Reference Figure 3 According to some embodiments of the present invention, a first vent hole 232 is formed on the peripheral wall of the valve cover 23. The first vent hole 232 extends downwardly in a direction from the inside of the valve cover 23 to the outside of the valve cover 23, and can guide the liquid in the ventilation cavity 231, so that the liquid in the ventilation cavity 231 can quickly flow out from the first vent hole 232.

[0054] Reference Figure 3 According to some embodiments of the present invention, a second vent hole 214 is formed on the peripheral wall of the valve body 21, and the second vent hole 214 is used to connect the channel 211 with the ventilation cavity 231. The second vent hole 214 can facilitate the exchange of gas in the channel 211 with gas in the ventilation cavity 231. The valve core 25 is provided at the second end 213 of the valve body 21 and at least part of the valve core 25 is accommodated in the channel 211 to block the second end 213 of the valve body 21. The valve core 25 can move between a first position and a second position along the axial direction of the valve body 21, so as to realize the connection or isolation between the channel 211 and the ventilation cavity 231.

[0055] Among them, when in the first position, the valve core 25 closes the second vent hole 214, and when in the second position, the valve core 25 opens the second vent hole 214. For example, when the pressure of the inner cavity 112 of the reducer 1 is higher than the pressure of the external environment and reaches a certain difference, the pressure difference between the inner cavity 112 of the reducer 1 and the external environment can overcome the elastic force of the spring 24 to push the valve core 25 to move and compress the spring 24 along the movement direction of the valve core 25, so that the valve core 25 moves relative to the valve body 21 to the position of the connecting channel 211 and the vent cavity 231, so that the inner cavity 112 of the reducer 1 can be indirectly connected with the external environment, and then the gas in the inner cavity 112 of the reducer 1 can be quickly discharged to the external environment, which is helpful to quickly reduce the pressure of the inner cavity 112 of the reducer 1, so that the pressure of the inner cavity 112 of the reducer 1 and the external environment are quickly balanced, thereby reducing the possibility of the reducer 1 failing due to the excessive pressure in the inner cavity 112 of the reducer 1, which is conducive to extending the service life of the reducer 1.

[0056] For another example, when the pressure difference between the inner cavity 112 of the reducer 1 and the external environment is relatively small and within a safe range, the spring 24 can drive the valve core 25 to move in time due to its own elastic restoring force so that the valve core 25 moves to a position that separates the channel 211 and the ventilation cavity 231, thereby reducing the possibility that dust or moisture in the external environment enters the inner cavity 112 of the reducer 1 through the ventilation cavity 231 and the channel 211 and damages the reducer 1.

[0057] The valve core 25 can move between a first position and a second position along the axial direction of the valve body 21, and when in the first position, the valve core 25 closes the second vent hole 214, and when in the second position, the valve core 25 opens the second vent hole 214, so that when the pressure in the inner cavity 112 of the reducer 1 is too high, the vent valve 2 can automatically adjust the position of the valve core 25, so that the pressure in the inner cavity 112 of the reducer 1 and the external environment are quickly balanced, thereby reducing the possibility of the reducer 1 failing due to excessive pressure in the inner cavity 112, and when the pressure difference between the inner cavity 112 of the reducer 1 and the external environment is relatively small and within a safe range, the spring 24 can drive the valve core 25 to timely isolate the channel 211 and the vent cavity 231, thereby reducing the possibility of dust or moisture in the external environment entering the inner cavity 112 of the reducer 1 through the vent cavity 231 and the channel 211 and damaging the reducer 1.

[0058] The at least partial accommodation of the valve core 25 in the channel 211 may include the following situations: for example, the entire valve core 25 may be accommodated in the channel 211; for another example, a part of the valve core 25 may be accommodated in the channel 211.

[0059] Reference Figure 3According to some embodiments of the present invention, there are multiple second vent holes 214, and the multiple second vent holes 214 are arranged at intervals along the circumference of the valve body 21, which can increase the ventilation area of ​​the valve body 21, thereby enhancing the effect of gas circulation at the valve body 21.

[0060] Reference Figure 3 According to some embodiments of the present invention, the second vent hole 214 extends downwardly and obliquely in the direction from the inside of the valve body 21 to the outside of the valve body 21. While facilitating the discharge of gas in the channel 211 to the ventilation cavity 231 through the second vent hole 214, the liquid in the ventilation cavity 231 can be prevented from flowing into the channel 211 through the second vent hole 214 by utilizing the downward force of the liquid's own gravity.

[0061] Reference Figure 3 According to some embodiments of the present invention, the second vent hole 214 and the first vent hole 232 are staggered in the radial direction of the valve body 21, which can reduce or prevent dust or moisture in the external environment from entering the channel 211 through the second vent hole 214. If dust or moisture in the external environment directly enters the channel 211 through the first vent hole 232 and the second vent hole 214, it is easy to damage the reducer 1. By staggering the second vent hole 214 and the first vent hole 232 in the radial direction of the valve body 21, the shielding of the second vent hole 214 can be increased, and dust or moisture in the external environment can be reduced or prevented from entering the ventilation cavity 231 through the first vent hole 232 and then directly entering the inner cavity 112 of the reducer 1 through the second vent hole 214 and the channel 211.

[0062] Reference Figure 3 According to some embodiments of the present invention, a first ventilation gap 251 is defined between the outer peripheral wall of the valve core 25 and the inner peripheral wall of the valve body 21, and a sealing protrusion 252 is provided on the outer peripheral wall of the valve core 25. The sealing protrusion 252 is in sealing contact with the inner peripheral wall of the valve body 21, and the sealing protrusion 252 is located on the side of the first ventilation gap 251 away from the first end 212 of the valve body 21. In the first position, the sealing protrusion 252 is opposite to the second ventilation hole 214 to close the second ventilation hole 214, and in the second position, the sealing protrusion 252 is located on the side of the second ventilation hole 214 away from the first end 212 of the valve body 21 to open the second ventilation hole 214. The sealing protrusion 252 is provided on the outer peripheral wall of the valve core 25 and the sealing protrusion 252 is in sealing contact with the inner peripheral wall of the valve body 21, so as to control the opening or closing of the second ventilation hole 214.

[0063] When the valve core 25 moves to the first position, the sealing protrusion 252 is opposite to the second vent hole 214 to close the second vent hole 214. At this time, the sealing protrusion 252 is opposite to the second vent hole 214 to close the second vent hole 214. The sealing protrusion 252 is in sealing contact with the inner peripheral wall of the valve body 21 to enhance the sealing effect at the second vent hole 214 and reduce the possibility of gas leakage through the second vent hole 214. When the valve core 25 moves to the second position, the sealing protrusion 252 is located on the side of the second vent hole 214 away from the first end 212 of the valve body 21, so as to prevent the second vent hole 214 from leaking. Open the second vent hole 214 to connect the channel 211 with the vent cavity 231, and connect the vent cavity 231 with the external environment through the first vent hole 232, so that the inner cavity 112 of the reducer 1 can be indirectly connected with the external environment, so that the gas in the inner cavity 112 of the reducer 1 can be quickly discharged to the external environment, which helps to quickly reduce the pressure of the inner cavity 112, so that the pressure of the inner cavity 112 of the reducer 1 and the external environment are quickly balanced, thereby reducing the possibility of the reducer 1 failing due to excessive pressure in the inner cavity 112, which is beneficial to prolonging the service life of the reducer 1.

[0064] Optionally, when there are multiple second air holes 214 arranged at circumferential intervals along the valve body 21, the sealing protrusion 252 can extend along the circumference of the valve core 25. For example, the sealing protrusion 252 can be in a ring shape extending along the circumference of the valve core 25. In the first position, the sealing protrusion 252 can close all the second air holes 214 at the same time.

[0065] Reference Figure 3 According to some embodiments of the present invention, the sealing protrusion 252 is a rubber block, which has good elasticity. When the valve core 25 is in the first position, the sealing protrusion 252 is a rubber block, which can enhance the sealing effect between the sealing protrusion 252 and the inner peripheral wall of the valve body 21, thereby enhancing the sealing effect of the second vent hole 214 and reducing the possibility of air leakage through the second vent hole 214. For example, when there is a small gap between the sealing protrusion 252 and the inner peripheral wall of the valve body 21, the rubber block can fill this gap to enhance the sealing effect between the sealing protrusion 252 and the inner peripheral wall of the valve body 21.

[0066] Reference Figure 3 According to some embodiments of the present invention, a mounting groove is formed on the outer peripheral wall of the valve core 25, and a portion of the rubber block is accommodated in the mounting groove. The mounting groove can facilitate the installation of the rubber block on the valve core 25, and the portion of the rubber block accommodated in the mounting groove can make the overall structure of the rubber block and the valve core 25 compact.

[0067] Reference Figure 3According to some embodiments of the present invention, the sealing protrusion 252 is a rubber block; and a mounting groove is formed on the outer peripheral wall of the valve core 25, and part of the rubber block is accommodated in the mounting groove. When the valve core 25 is in the first position, the sealing protrusion 252 is a rubber block, which can enhance the sealing effect on the second vent hole 214 and reduce the possibility of air leakage through the second vent hole 214; and the mounting groove can facilitate the installation of the rubber block on the valve core 25, and can also make the overall structure of the rubber block and the valve core 25 compact.

[0068] Reference Figure 3 According to some embodiments of the present invention, the outer peripheral wall of the valve core 25 forms a limiting flange 254, and the limiting flange 254 is located on the side of the valve body 21 close to the spring 24. When in the first position, the limiting flange 254 abuts against the axial end face of the valve body 21 close to the spring 24. The limiting flange 254 can limit the valve core 25. When the valve core 25 is in the first position, the limiting flange 254 abuts against the axial end face of the valve body 21 close to the spring 24, which can limit the valve core 25 from continuing to move toward the side of the valve body 21 away from the spring 24, so that the valve core 25 stably stops at the first position, and can also prevent the valve core 25 from excessively moving and causing damage to the vent valve 2; and when in the first position, the limiting flange 254 abuts against the axial end face of the valve body 21 close to the spring 24, which can make the connection between the valve core 25 and the valve body 21 simple and have strong stability.

[0069] Reference Figure 3 According to some embodiments of the present invention, the valve core 25 includes a valve core body 255 and a sealing membrane 256. A third vent hole 257 is formed in the valve core body 255. The third vent hole 257 penetrates the valve core body 255 along the axial direction of the valve core body 255 and the third vent hole 257 is used to connect the channel 211 and the ventilation cavity 231. The third vent hole 257 can facilitate the exchange of gas in the channel 211 and gas in the ventilation cavity 231. The sealing membrane 256 is installed at the third air vent 257, and the outer peripheral surface of the sealing membrane 256 includes a first sealing surface 258, and the inner peripheral wall of the third air vent 257 includes a second sealing surface 259. The first sealing surface 258 and the second sealing surface 259 both extend obliquely in the direction from the second end 213 of the valve body 21 to the first end 212 of the valve body 21 toward the direction away from the central axis of the third air vent 257, which can guide the installation of the sealing membrane 256 on the valve core body 255 and ensure that the sealing membrane 256 is accurately assembled on the valve core body 255.

[0070] Among them, the sealing membrane 256 has a first state and a second state. In the first state, the first sealing surface 258 and the second sealing surface 259 are sealed and fitted to close the third air vent 257. In the first state, the first sealing surface 258 and the second sealing surface 259 are both inclined to extend in the direction from the second end 213 of the valve body 21 to the first end 212 of the valve body 21 toward the direction away from the central axis of the third air vent 257. The sealing fit between the first sealing surface 258 and the second sealing surface 259 can enhance the sealing effect at the third air vent 257 and reduce the possibility of gas leakage through the third air vent 257.

[0071] In the second state, the first sealing surface 258 is spaced apart from the second sealing surface 259 to form a second ventilation gap. At this time, the third ventilation hole 257 is in an open state, so that the inner cavity 112 of the reducer 1 can be indirectly connected to the ventilation cavity 231, and the inner cavity 112 of the reducer 1 is connected to the external environment through the first ventilation hole 232. The inner cavity 112 of the reducer 1 can be indirectly connected to the external environment, so that the gas in the inner cavity 112 of the reducer 1 can be exchanged with the external environment through the third ventilation hole 257 and the first ventilation hole 232, so that the pressure of the inner cavity 112 of the reducer 1 and the external environment is quickly balanced.

[0072] For example, when the pressure of the inner cavity 112 of the reducer 1 is higher than the pressure of the external environment and reaches a certain difference, the pressure difference between the inner cavity 112 of the reducer 1 and the external environment can overcome the elastic force of the spring 24 to push the valve core 25 to move upward, so that the valve core 25 moves to the first position. At this time, the second vent hole 214 is opened to connect the channel 211 and the ventilation cavity 231, the sealing membrane 256 is in the first state, the first sealing surface 258 and the second sealing surface 259 are sealed to close the third vent hole 257, and the ventilation cavity 231 is connected to the external environment through the first vent hole 232, so that the inner cavity 112 of the reducer 1 can be indirectly connected to the external environment, and then the gas in the inner cavity 112 of the reducer 1 can be quickly discharged to the external environment, which helps to quickly reduce the pressure of the inner cavity 112 of the reducer 1, so that the pressure of the inner cavity 112 of the reducer 1 and the external environment are quickly balanced, thereby reducing the possibility of the reducer 1 failing due to excessive pressure in the inner cavity 112, which is beneficial to prolonging the service life of the reducer 1.

[0073] For another example, when the pressure difference between the inner cavity 112 of the reducer 1 and the external environment is relatively small and within a safe range, the spring 24 can drive the valve core 25 downward in time due to its own elastic restoring force, so that the valve core 25 moves to the second position. At this time, the second vent hole 214 is closed to isolate the channel 211 and the vent cavity 231. Among them, when the pressure of the inner cavity 112 of the reducer 1 is lower than the pressure of the external environment and reaches a certain difference, the sealing membrane 256 is in the second state, the first sealing surface 258 and the second sealing surface 259 are spaced apart to form a second ventilation gap, and the third ventilation hole 257 is opened to connect the channel 211 and the ventilation cavity 231, and the ventilation cavity 231 is connected with the external environment through the first ventilation hole 232, so that the inner cavity 112 of the reducer 1 can be indirectly connected with the external environment, and then the gas in the external environment can enter the inner cavity 112 of the reducer 1 to quickly increase the pressure of the inner cavity 112 of the reducer 1, so that the pressure of the inner cavity 112 of the reducer 1 and the external environment are quickly balanced, thereby reducing the possibility of the reducer 1 failing due to too low pressure in the inner cavity 112, which is beneficial to prolonging the service life of the reducer 1.

[0074] When the sealing membrane 256 is in the second state, the first sealing surface 258 and the second sealing surface 259 are separated to form a second ventilation gap, so that the third ventilation hole 257 is in an open state. In this way, when the pressure in the inner cavity 112 of the reducer 1 is too low, the ventilation valve 2 can automatically switch the state of the sealing membrane 256, so that the pressure of the inner cavity 112 of the reducer 1 and the external environment are quickly balanced, thereby reducing the possibility of the reducer 1 failing due to the excessively low pressure in the inner cavity 112, which is beneficial to extending the service life of the reducer 1.

[0075] Optionally, when the above-mentioned sealing protrusion 252 is provided on the valve core 25 , a first ventilation gap 251 is defined between the outer peripheral wall of the valve core body 255 and the inner peripheral wall of the valve body 21 , and the sealing protrusion 252 is provided on the outer peripheral wall of the valve core body 255 .

[0076] Reference Figure 3According to some embodiments of the present invention, the sealing membrane 256 includes a fixing portion 260 and a sealing portion 261, the fixing portion 260 is connected to the valve core body 255 and is located in the third vent hole 257, the sealing portion 261 is connected to the fixing portion 260 and is in a conical cylindrical shape, and the outer peripheral surface of the sealing portion 261 includes a first sealing surface 258. The third vent hole 257 can facilitate the assembly of the sealing membrane 256 on the valve core body 255, and can make the overall structure of the sealing membrane 256 and the valve core body 255 compact. The sealing portion 261 is connected to the fixing portion 260, and the fixing portion 260 can support and fix the sealing portion 261. The sealing portion 261 is conical and the outer peripheral surface of the sealing portion 261 includes a first sealing surface 258, so that the first sealing surface 258 can be extended obliquely in the direction from the second end 213 of the valve body 21 to the first end 212 of the valve body 21 toward the central axis away from the third air vent 257. When the sealing membrane 256 is in the first state, the first sealing surface 258 and the second sealing surface 259 can be closely fitted to enhance the sealing effect at the third air vent 257.

[0077] Reference Figure 3 According to some embodiments of the present invention, the valve core 25 includes a diaphragm fixing seat 262, the diaphragm fixing seat 262 is located in the third vent hole 257 and the diaphragm fixing seat 262 is connected to the valve core body 255, and the outer peripheral wall of the diaphragm fixing seat 262 and the inner peripheral wall of the third vent hole 257 define a third ventilation gap 263, and the third ventilation gap 263 is suitable for communicating with the second ventilation gap. The diaphragm fixing seat 262 is located in the third vent hole 257, so that the overall structure of the diaphragm fixing seat 262 and the valve core body 255 can be compact. When the sealing membrane 256 is in the second state, the first sealing surface 258 is spaced from the second sealing surface 259 to form a second ventilation gap, and the third ventilation gap 263 is connected with the second ventilation gap, so that the gas in the inner cavity 112 and the gas in the ventilation cavity 231 can be exchanged through the second ventilation gap and the third ventilation gap 263.

[0078] Reference Figure 3 According to some embodiments of the present invention, the valve core 25 also includes a waterproof breathable membrane 264, which is located in the third vent hole 257 and on the side of the sealing membrane 256 away from the first end 212 of the valve body 21, so as to prevent water from entering the inner cavity 112 of the reducer 1 through the third vent hole 257 and the channel 211 and causing the reducer 1 to fail.

[0079] For example, when the pressure in the inner cavity 112 of the reducer 1 is too low, the spring 24 drives the valve core 25 to move downward due to its own elastic restoring force, so that the valve core 25 moves to the second position. At this time, the second vent hole 214 is closed to separate the channel 211 and the vent cavity 231, the sealing membrane 256 is in the second state, the first sealing surface 258 and the second sealing surface 259 are spaced apart to form a second ventilation gap, the third vent hole 257 is opened to connect the channel 211 and the vent cavity 231, and the vent cavity 231 is connected to the external environment through the first vent hole 232. , the inner cavity 112 of the reducer 1 can be indirectly connected with the external environment, so that the gas in the external environment can enter the inner cavity 112 of the reducer 1 to quickly increase the pressure of the inner cavity 112 of the reducer 1, so that the pressure of the inner cavity 112 of the reducer 1 and the external environment are quickly balanced; and, by virtue of the waterproof and breathable membrane 264 being located in the third vent hole 257 and on the side of the sealing membrane member 256 away from the first end 212 of the valve body 21, moisture in the external environment can be prevented from entering the inner cavity 112 through the third vent hole 257 and causing the reducer 1 to fail.

[0080] Optionally, the waterproof breathable membrane 264 can be glued and fixed to the membrane fixing seat 262, and the membrane fixing seat 262 can fix and support the waterproof breathable membrane 264. The waterproof breathable membrane 264 and the membrane fixing seat 262 are connected by gluing, which can make the connection between the waterproof breathable membrane 264 and the membrane fixing seat 262 simple and have strong stability.

[0081] Reference Figure 3 According to some embodiments of the present invention, a first ventilation gap 251 is defined between the outer peripheral wall of the valve core 25 and the inner peripheral wall of the valve body 21, and a sealing protrusion 252 is provided on the outer peripheral wall of the valve core 25. The sealing protrusion 252 is in sealing contact with the inner peripheral wall of the valve body 21, and the sealing protrusion 252 is located on a side of the first ventilation gap 251 away from the first end 212 of the valve body 21. In the first position, the sealing protrusion 252 is opposite to the second ventilation hole 214 to close the second ventilation hole 214, and in the second position, the sealing protrusion 252 is located on a side of the second ventilation hole 214 away from the first end 212 of the valve body 21 to open the second ventilation hole 214.

[0082] The sealing membrane 256 further includes an oil-blocking flange 265, which is connected to the outer peripheral side of the first sealing surface 258. In the first state, the oil-blocking flange 265 is located on the side of the valve core body 255 close to the first end 212 of the valve body 21, and the side of the first ventilation gap 251 facing the first end 212 of the valve body 21 is formed as a gap opening 266, and the oil-blocking flange 265 blocks a portion of the gap opening 266 along the radial direction of the valve body 21. The portion of the oil-blocking flange 265 that blocks the gap opening 266 along the radial direction of the valve body 21 can block the gap opening 266, thereby reducing or preventing the oil in the inner cavity 112 from entering the first ventilation gap 251 through the channel 211 and the gap opening 266 and being discharged to the external environment through the second ventilation hole 214 and the first ventilation hole 232.

[0083] For example, when the pressure in the inner cavity 112 of the reducer 1 is too high, the pressure difference between the inner cavity 112 and the external environment can overcome the elastic force of the spring 24 to push the valve core 25 to move to the first position. At this time, the second vent hole 214 is opened to connect the channel 211 with the vent cavity 231, the sealing membrane 256 is in the first state, the first sealing surface 258 and the second sealing surface 259 are sealed to close the third vent hole 257, and the vent cavity 231 is connected with the external environment through the first vent hole 232, so that the inner cavity 112 of the reducer 1 can be indirectly connected with the external environment, and the gas in the inner cavity 112 of the reducer 1 can be passed through the first ventilation gap 251 and the second vent hole 214. And the first air vent 232 is quickly discharged to the external environment, which helps to quickly reduce the pressure of the inner cavity 112 of the reducer 1, so that the pressure of the inner cavity 112 of the reducer 1 and the external environment are quickly balanced; and, by the oil retaining flange 265 radially blocking the gap opening 266 of the valve body 21, the gap opening 266 can be blocked, reducing or preventing the oil in the inner cavity 112 of the reducer 1 from entering the first ventilation gap 251 through the channel 211 and the gap opening 266, thereby reducing or preventing the oil in the inner cavity 112 of the reducer 1 from being discharged to the external environment through the first ventilation gap 251, the second air vent 214 and the first air vent 232.

[0084] Reference Figure 2 and Figure 3 The reducer 1 according to the second embodiment of the present invention comprises a vent valve 2 according to the first embodiment of the present invention.

[0085] According to the reducer 1 of the embodiment of the present invention, the above-mentioned vent valve 2 is provided, and the valve core 25 of the vent valve 2 is movably provided on the valve body 21 to connect or isolate the channel 211 and the vent cavity 231, so that when the pressure in the inner cavity 112 of the reducer 1 is too high, the vent valve 2 can automatically adjust the position of the valve core 25, so that the pressure of the inner cavity 112 of the reducer 1 and the external environment are quickly balanced, thereby reducing the possibility of failure of the reducer 1 due to excessive pressure in the inner cavity 112, which is beneficial to prolonging the service life of the reducer 1.

[0086] Reference Figure 2 According to some embodiments of the present invention, the valve body 21 is detachably connected to the mounting hole, which can facilitate maintenance or replacement of the vent valve 2.

[0087] Reference Figure 2 According to some embodiments of the present invention, the valve body 21 is threadedly connected to the mounting hole, which can make the connection between the reducer housing 11 and the valve body 21 simple and have strong stability, and can also facilitate the installation or removal of the vent valve 2 on the reducer housing 11.

[0088] Reference Figure 1-Figure 3 The drive axle assembly 1a according to the third embodiment of the present invention comprises the reducer 1 according to the second embodiment of the present invention. For example, the drive axle assembly 1a may be an electric drive axle assembly 1a.

[0089] According to the drive axle assembly 1a of the embodiment of the present invention, the reducer 1 is provided, and the reducer 1 includes a vent valve 2. The valve core 25 of the vent valve 2 can be movably arranged on the valve body 21 to connect or isolate the channel 211 and the vent cavity 231, so that when the pressure in the inner cavity 112 of the reducer 1 is too high, the vent valve 2 can automatically adjust the position of the valve core 25, so that the pressure of the inner cavity 112 of the reducer 1 and the external environment are quickly balanced, thereby reducing the possibility of failure of the reducer 1 due to excessive pressure in the inner cavity 112, which is beneficial to extending the service life of the reducer 1.

[0090] Reference Figure 1-Figure 3 , a vehicle according to an embodiment of the fourth aspect of the present invention comprises a drive axle assembly 1a according to an embodiment of the third aspect of the present invention.

[0091] According to the vehicle of the embodiment of the present invention, the drive axle assembly 1a is provided, the drive axle assembly 1a includes a reducer 1, the reducer 1 includes a vent valve 2, the valve core 25 of the vent valve 2 is movably provided on the valve body 21 to connect or isolate the channel 211 and the vent cavity 231, so that when the pressure in the inner cavity 112 of the reducer 1 is too high, the vent valve 2 can automatically adjust the position of the valve core 25, so that the pressure of the inner cavity 112 of the reducer 1 is quickly balanced with that of the external environment, thereby reducing the possibility of failure of the reducer 1 due to excessive pressure in the inner cavity 112, which is beneficial to extending the service life of the reducer 1.

[0092] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0093] In the description of the present invention, "first feature" or "second feature" may include one or more of the features.

[0094] In the description of the present invention, a first feature being “on” or “under” a second feature may include that the first and second features are directly in contact with each other, or may include that the first and second features are not in direct contact with each other but are in contact with each other via another feature therebetween.

[0095] In the description of the present invention, “on”, “over” and “above” a first feature from a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0096] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" 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 representation of the above terms does 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.

[0097] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A vent valve, characterized in that: Used for a reducer, the reducer comprises a reducer housing, a mounting hole is formed on the reducer housing, the vent valve is suitable for being mounted in the mounting hole and is used to connect the inner cavity of the reducer housing with the external environment, the vent valve comprises: A valve body, wherein the valve body has a passage therein adapted to communicate with the inner cavity of the reducer housing, the valve body has a first end and a second end, and the first end of the valve body is adapted to be mounted in the mounting hole; A valve cover, the valve cover is disposed at the second end of the valve body and is detachably connected to the valve cover, a ventilation cavity is defined between the valve cover and the valve body, and a first ventilation hole is formed on the valve cover to connect the ventilation cavity with the external environment; A valve core, the valve core is movably disposed on the valve body to connect or block the passage and the ventilation cavity; A spring is located in the ventilation cavity, one end of the spring is connected to the valve core and the other end of the spring is connected to the valve cover, and the spring can be elastically deformed in the movement direction of the valve core.

2. The vent valve according to claim 1, characterized in that The first ventilation holes are formed on the peripheral wall of the valve housing and are in plurality. The plurality of first ventilation holes are arranged at intervals along the circumferential direction of the valve housing.

3. The vent valve according to claim 1, characterized in that The passage extends in the up-down direction, the lower end of the valve body is suitable for being installed in the installation hole, and the valve cover is arranged on the upper end of the valve body.

4. The vent valve according to claim 3, characterized in that: The first vent hole is formed at a lower end of the valve cover.

5. The vent valve according to claim 4, characterized in that The first vent hole is formed in a peripheral wall of the valve housing, and the first vent hole extends obliquely downward in a direction from the inside of the valve housing to the outside of the valve housing.

6. The vent valve according to claim 1, characterized in that A second vent hole is formed on the peripheral wall of the valve body, and the second vent hole is used to connect the passage and the vent cavity. The valve core is arranged at the second end of the valve body and is at least partially accommodated in the passage to block the second end of the valve body. The valve core can move between a first position and a second position along the axial direction of the valve body. Wherein, when in the first position, the valve core closes the second vent hole; when in the second position, the valve core opens the second vent hole.

7. The vent valve according to claim 6, characterized in that There are a plurality of the second vent holes, and the plurality of the second vent holes are arranged at intervals along the circumference of the valve body.

8. The vent valve according to claim 6, characterized in that The second vent hole extends obliquely downward in a direction from the inside of the valve body to the outside of the valve body.

9. The vent valve according to claim 6, characterized in that: The second vent hole is staggered with the first vent hole in the radial direction of the valve body.

10. The vent valve according to claim 6, characterized in that A first ventilation gap is defined between the outer peripheral wall of the valve core and the inner peripheral wall of the valve body, a sealing protrusion is provided on the outer peripheral wall of the valve core, the sealing protrusion is in sealing contact with the inner peripheral wall of the valve body, and the sealing protrusion is located on a side of the first ventilation gap away from the first end of the valve body; Wherein, in the first position, the sealing protrusion is opposite to the second vent hole to close the second vent hole; in the second position, the sealing protrusion is located on the side of the second vent hole away from the first end of the valve body to open the second vent hole.

11. The vent valve according to claim 10, characterized in that The sealing protrusion is a rubber block; and / or a mounting groove is formed on the outer peripheral wall of the valve core, and a part of the rubber block is accommodated in the mounting groove.

12. The vent valve according to claim 6, characterized in that The outer peripheral wall of the valve core forms a limiting flange, and the limiting flange is located on a side of the valve body close to the spring. When in the first position, the limiting flange abuts against an axial end face of the valve body close to the spring.

13. The vent valve according to claim 6, characterized in that The valve core comprises a valve core body and a sealing film, a third vent hole is formed in the valve core body, the third vent hole penetrates the valve core body along the axial direction of the valve core body and is used to connect the channel with the vent cavity, the sealing film is installed at the third vent hole, the outer peripheral surface of the sealing film comprises a first sealing surface, the inner peripheral wall of the third vent hole comprises a second sealing surface, the first sealing surface and the second sealing surface both extend obliquely in a direction from the second end of the valve body to the first end of the valve body toward a direction away from the central axis of the third vent hole; The sealing membrane has a first state and a second state. In the first state, the first sealing surface is sealed with the second sealing surface to close the third ventilation hole. In the second state, the first sealing surface is spaced apart from the second sealing surface to form a second ventilation gap.

14. The vent valve according to claim 13, characterized in that The sealing membrane comprises a fixing portion and a sealing portion, wherein the fixing portion is connected to the valve core body and is located in the third vent hole, the sealing portion is connected to the fixing portion and is in a conical cylindrical shape, and the outer peripheral surface of the sealing portion comprises the first sealing surface.

15. The vent valve according to claim 14, characterized in that The valve core includes a diaphragm fixing seat, which is located in the third ventilation hole and connected to the valve core body. The outer peripheral wall of the diaphragm fixing seat and the inner peripheral wall of the third ventilation hole define a third ventilation gap, and the third ventilation gap is suitable for communicating with the second ventilation gap.

16. The vent valve according to claim 13, characterized in that The valve core further comprises a waterproof and breathable membrane, which is located in the third vent hole and on a side of the sealing membrane member away from the first end of the valve body.

17. The vent valve according to claim 13, characterized in that A first ventilation gap is defined between the outer peripheral wall of the valve core and the inner peripheral wall of the valve body, a sealing protrusion is provided on the outer peripheral wall of the valve core, the sealing protrusion is in sealing contact with the inner peripheral wall of the valve body, and the sealing protrusion is located on a side of the first ventilation gap away from the first end of the valve body; Wherein, when in the first position, the sealing protrusion is opposite to the second vent hole to close the second vent hole; when in the second position, the sealing protrusion is located on a side of the second vent hole away from the first end of the valve body to open the second vent hole; The sealing membrane also includes an oil-blocking flange, which is connected to the outer peripheral side of the first sealing surface. In the first state, the oil-blocking flange is located on a side of the valve core body close to the first end of the valve body, and a side of the first ventilation gap facing the first end of the valve body is formed as a gap opening. The oil-blocking flange blocks a portion of the gap opening along the radial direction of the valve body.

18. A reducer, characterized in that: include: A vent valve according to any one of claims 1 to 17.

19. The reducer according to claim 18, characterized in that: The valve body is detachably connected to the mounting hole.

20. A drive axle assembly, characterized in that: include: A reducer according to any one of claims 18-19.

21. A vehicle, characterized in that: include: The drive axle assembly according to claim 20.

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