Ventilation device and transmission having same

Abstract

The utility model relates to a venting device field, concretely relates to a venting device and the transmission with it. The venting device includes the valve seat and is located at the venting valve of the venting port of valve seat, the venting valve includes the cover of valve seat and is connected in the valve piece of the venting cover through the first elastic part, the valve piece can open or block the venting port, the valve piece is equipped with the second through -hole with the venting port intercommunication, the second through -hole place is equipped with the air inlet valve, the air inlet valve is elastically installed in the valve piece through the second elastic part far from one side of valve seat, to make the air inlet valve part between the venting cover with the valve piece, another part of air inlet valve can open or block the second through -hole. The utility model discloses the venting device through the valve piece and the setting of air inlet valve at the venting port can realize the function of two -way ventilation of air -intake, exhaust.

Description

TECHNICAL FIELD

[0001] The utility model relates to a venting device field, concretely relates to a venting device and the transmission with it. BACKGROUND

[0002] When the transmission or electric drive system is working, the internal temperature rises, the temperature of the gas in it rises, due to the principle of thermal expansion and contraction, the volume of the gas expands, and the pressure of the gas also increases; when the transmission or electric drive system stops working, the internal temperature slowly cools from high temperature, and in the cooling process, the temperature of the gas in it also cools, due to the principle of thermal expansion and contraction, the volume of the gas shrinks, and the pressure of the gas also decreases, generating negative pressure.

[0003] No matter whether the transmission or electric drive system internal gas pressure increases or generates negative pressure, it may cause damage to the parts inside it, especially to the related joint surface and oil seal, causing the risk of water ingress and oil leakage.

[0004] Therefore, a venting device needs to be used on the transmission and electric drive system to ventilate the inside and outside of the equipment, balance the internal and external pressure difference, and prevent the gas pressure from damaging the parts inside the equipment. However, the existing venting equipment only has a single venting function and cannot meet the demand. SUMMARY

[0005] Therefore, the utility model provides a venting device and the transmission with it, so as to solve or at least alleviate one or more of the above problems and other problems in the prior art.

[0006] In order to achieve the foregoing purpose, the first aspect of the utility model provides a venting device, which comprises a valve seat and a venting valve arranged at a venting port of the valve seat;

[0007] The venting valve comprises a venting cover arranged on the valve seat and a valve plate connected to the venting cover by a first elastic member, and the valve plate can open or block the venting port;

[0008] The valve plate is provided with a second through hole in communication with the venting port, and an air inlet valve is arranged at the second through hole, the air inlet valve is elastically mounted on one side of the valve plate away from the valve seat by a second elastic member, so that the air inlet valve is partially located between the venting cover and the valve plate, and the other part of the air inlet valve can open or block the second through hole.

[0009] In the venting device as described above, optionally, the air inlet valve comprises a valve rod penetrating the second through hole with a gap, and a mounting seat and a valve head arranged at both ends of the valve rod, respectively;

[0010] The mounting base is connected to the side of the valve plate away from the valve seat via a second elastic element, and the valve head abuts against the edge of the vent on the other side of the valve plate to block the vent.

[0011] In the ventilation device described above, optionally, the diameter of the mounting base and the valve head is greater than the diameter of the valve stem and the second through hole, and the diameter of the valve stem is smaller than the diameter of the second through hole. The air intake valve forms an "I"-shaped structure with a cross-section that is wide at both ends and narrow in the middle. The valve head, the valve stem, and the mounting base of the air intake valve are integrally formed parts.

[0012] In the ventilation device described above, optionally, the valve stem and the valve head of the air intake valve are integrally formed, and the mounting base is detachably mounted on the valve stem.

[0013] In the ventilation device described above, optionally, the mounting end of the mounting seat of the valve stem is provided with a plurality of elastic mounting portions, there is a gap between the plurality of mounting portions, and the end of the mounting portion is provided with a snap-fit ​​portion protruding outward;

[0014] The mounting base is provided with a third through hole, and a second boss protrudes from the inner circumference of the third through hole. The snap-fit ​​part can snap onto the second boss, and the second boss has a central through hole coaxial with the third through hole.

[0015] The snap-fit ​​part can extend into the central through hole and be squeezed by the inner wall of the central through hole. Together with the mounting part, it elastically converges towards the gap, reducing the diameter of the mounting part to pass through the central through hole. Then, the squeezing force on the snap-fit ​​part and the mounting part is eliminated, and they spring back outward. The snap-fit ​​part snaps into the third through hole and abuts against the second protrusion.

[0016] In the ventilation device described above, optionally, the diameter of the snap-fit ​​portion decreases axially from a position near the mounting portion at its end.

[0017] In the ventilation device described above, optionally, the outer peripheral top surface of the mounting base is provided with a third protrusion extending outward therefrom, and the third protrusion is connected to the second elastic member.

[0018] In the ventilation device described above, optionally, the end of the ventilation hood is provided with an inwardly protruding abutment, the abutment being wedge-shaped, and the abutment abutting against the outer wall of the valve seat.

[0019] In the ventilation device described above, optionally, the edge of the vent of the valve seat has a first protrusion extending outward, and the abutting portion abuts against the side of the first protrusion away from the vent.

[0020] To achieve the foregoing object, the second aspect of the utility model provides a kind of transmission, described transmission includes the breather of any one of the preceding first aspect.

[0021] The breather of the utility model includes valve seat and breather valve, and the breather valve includes valve sheet and air inlet valve installed in the second through hole of valve sheet, and the valve sheet can be opened or blocked in the breather of valve seat, and the air inlet valve can be opened or blocked in the second through hole.The pressure difference between the gas inside the equipment and the external gas can open the valve sheet to exhaust, or open the air inlet valve to intake, so that the gas inside and outside the equipment is exchanged, the internal and external pressure difference is balanced, and the gas pressure is prevented from damaging the internal parts of the equipment.

[0022] The utility model also provides a transmission, and the transmission has the respective features of the aforementioned breather, and thus also has the corresponding advantages thereof. BRIEF DESCRIPTION OF DRAWINGS

[0023] The disclosure of the utility model will be more apparent with reference to the drawings.The drawings should be understood to be for illustrative purposes only, and are not intended to limit the scope of protection of the utility model.

[0024] Figure 1 It is a three-dimensional schematic view of an embodiment of the breather of the utility model.

[0025] Figure 2 It is a sectional view schematic view of an embodiment of the breather of the utility model.

[0026] Figure 3 It is a sectional view schematic view of another embodiment of the breather of the utility model.

[0027] Figure 4 It is Figure 3 A three-dimensional schematic view of the valve stem and valve head of the air inlet valve of the breather in the embodiment of the utility model.

[0028] Figure 5 It is Figure 3 A three-dimensional schematic view of the mounting seat of the air inlet valve of the breather in the embodiment of the utility model.

[0029] Figure 6 It is Figure 3 A partial enlarged sectional view schematic view of the breather in the embodiment of the utility model, and the air inlet valve and valve sheet are shown in the figure.

[0030] Figure 7 It is Figure 3 A sectional view schematic view of the breather in the embodiment of the utility model, and the air outlet process of the breather is shown in the figure.

[0031] Figure 8 It is Figure 3 A sectional view schematic view of the breather in the embodiment of the utility model, and the air inlet process of the breather is shown in the figure.

[0032] 1-valve seat; 11-first through hole; 12-ventilation port; 13-first boss; 2-ventilation valve; 21-ventilation cover; 22-abutment; 23-first gap; 3-valve plate; 31-first elastic member; 32-second through hole; 33-second gap; 4-air inlet valve; 41-second elastic member; 5-valve rod; 51-valve head; 52-mounting portion; 53-clamping portion; 54-clearance; 6-mounting seat; 61-third through hole; 62-second boss; 63-third boss; 64-middle through hole. DETAILED DESCRIPTION

[0033] The structure, composition, characteristics and advantages of the ventilation device and the transmission having the same will be described below in an exemplary manner with reference to the drawings and specific examples, however, all the descriptions should not be used to form any limitation on the present application.

[0034] In addition, for any single technical feature described or implied in the embodiments mentioned herein, or any single technical feature shown or implied in the drawings, the present application still allows any combination or deletion to be continued between these technical features (or their equivalents) without any technical obstacles, so it should be considered that more embodiments according to the present application are also within the scope of the description herein.

[0035] It should be further noted that the terms "inner", "outer", "top", "bottom" and the like indicate the orientation or positional relationship based on the orientation or positional relationship of the ventilation device shown in the drawings, which is only for the convenience of describing the present disclosure and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present disclosure.

[0036] In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited by "first", "second", "third" can explicitly or implicitly include at least one of the features.

[0037] In the description of the present disclosure, the meaning of "a plurality of" is at least two, for example, two, three or more, etc., unless otherwise explicitly specified.

[0038] The ventilation device of the present application is used to connect the inside of the equipment, discharge the gas with excessive pressure inside the equipment, or introduce the external gas into the equipment when the negative pressure of the gas is generated inside the equipment, so as to maintain the balance of the air pressure inside and outside the equipment, thereby preventing other components inside the equipment from being damaged due to the air pressure. It should be noted that the equipment refers to the equipment which needs to intake and / or discharge air, such as transmission, electric drive system, etc.

[0039] From Figure 1 It can be seen that the air vent device comprises a valve seat 1 and an air vent valve 2 connected to one end of the valve seat 1, and the other end of the valve seat 1 is used for connecting to equipment (not shown in the figure).

[0040] The valve seat 1 has a first through hole 11 (as shown in Figure 2 and Figure 3 ) therein, two ends of the first through hole 11 are respectively communicated with the air vent valve 2 and the inside of the equipment, and the end communicated with the air vent valve 2 is an air vent opening 12. The air vent valve 2 is arranged at the air vent opening 12 and is used for opening or blocking the air vent opening 12, so as to introduce the gas into the equipment or introduce the gas in the equipment out of the equipment through the first through hole 11 from the air vent opening 12.

[0041] In Figure 2 and Figure 3 embodiments, the edge of the air vent opening 12 of the valve seat 1 can be extended outward to form a first boss 13.

[0042] The air vent valve 2 comprises a vent cover 21 covering the valve seat 1, a valve piece 3 arranged in the vent cover 21 and an air inlet valve 4. Specifically, a first gap 23 is formed between the inner wall of the vent cover 21 and the outer peripheral wall of the first boss 13 of the valve seat 1.

[0043] The end of the vent cover 21 is provided with a plurality of abutting portions 22 protruding inward, the abutting portions 22 are used for abutting against the bottom of the first boss 13, and the plurality of abutting portions 22 are arranged at intervals. Optionally, the abutting portions 22 can be arranged in a wedge shape protruding inwardly of the vent cover 21 (as shown in Figure 1 ).

[0044] The number of the abutting portions 22 is at least two, and the abutting portions 22 are oppositely arranged. In Figure 2 and Figure 3 embodiments, the abutting portions 22 can be arranged at intervals of four, and in other embodiments, a plurality of abutting portions 22 can also be arranged at intervals.

[0045] The valve piece 3 covers the air vent opening 12 of the valve seat 1 and abuts against the edge of the air vent opening 12. The inside of the vent cover 21 is axially elastically connected to the valve piece 3 through a first elastic member 31, that is, one end of the first elastic member 31 is connected to the inner surface of the top wall of the vent cover 21, and the other end is connected to the end surface of the valve piece 3 away from the valve seat 1.

[0046] The first elastic member 31 presses the valve piece 3 against the edge of the air vent opening 12, so that the valve piece 3 blocks the air vent opening 12. The vent cover 21 is pushed away from the valve seat 1 by the force of the first elastic member 31 in the inside of the vent cover 21, so that the abutting portions 22 of the vent cover 21 abut against the bottom end of the first boss 13 of the valve seat 1 and balance the elastic force of the first elastic member 31, thereby keeping the stable covering of the vent cover 21 and preventing the vent cover 21 from falling off.

[0047] The valve plate 3 has a second through hole 32, and an intake valve 4 is provided at the second through hole 32. Specifically, the intake valve 4 is elastically mounted on the side of the valve plate 3 away from the valve seat 1 by a second elastic element 41, so that part of the intake valve 4 is located between the vent hood 21 and the valve plate 3, and the other part of the intake valve 4 is located on the other side of the valve plate 3 to block the second through hole 32. Thus, as shown in the figure, the entire structure of the intake valve 4 is completely mounted on the valve plate 3. Therefore, the first through hole 11 of the valve seat 1 is only connected to the vent valve 2 at the vent 12. When the valve plate 3 opens the vent 12, it can drive the intake valve 4 to move away from the valve seat 1, so that the vent 12 is opened, thereby making the first through hole 11 completely unobstructed. The intake valve 4 may include a valve stem 5, and valve heads 51 and mounting seats 6 respectively provided at both ends of the valve stem 5. Figure 2 and Figure 3 (As shown).

[0048] The diameters of the mounting base 6 and the valve head 51 are both larger than the diameter of the valve stem 5, causing the intake valve 4 to form an "I"-shaped structure with a cross-section that is wide at both ends and narrow in the middle. The diameters of the mounting base 6 and the valve head 51 are both larger than the diameter of the second through hole 32 of the valve plate 3, and the diameter of the valve stem 5 is smaller than the diameter of the second through hole 32.

[0049] Specifically, the valve stem 5 of the intake valve 4 passes through the second through hole 32 of the valve plate 3. The valve heads 51 at both ends of the intake valve 4 and the mounting base 6 are located on two opposite sides of the valve plate 3, that is, the mounting base 6 is located on the side of the valve plate 3 away from the valve seat 1, and the valve head 51 is located on the side of the valve plate 3 facing the valve seat 1. The gap passes through the finger, and the portion of the intake valve 4 located within the second through hole 32 has a second gap 33 with the second through hole 32, and the intake valve 4 can move axially within the second through hole 32.

[0050] Mounting seat 6 is used to mount the second elastic element 41 and is connected to the side of valve plate 3 away from valve seat 1 via the second elastic element 41. That is, both ends of the second elastic element 41 are connected to mounting seat 6 and valve plate 3 respectively. The second elastic element 41 axially lifts mounting seat 6 away from valve seat 1. Valve stem 5 moves with mounting seat 6 and drives valve head 51 to press from the side of valve plate 3 facing valve seat 1 against the edge of second through hole 32 to seal second through hole 32.

[0051] Inside the vent 21, the valve head 51 of the air inlet valve 4 blocks the second through hole 32 of the valve plate 3. Thus, the valve plate 3 and the air inlet valve 4 can completely seal the vent 12 of the valve seat 1, thereby preventing external liquid from entering the equipment through the vent 12 of the valve seat 1 and also preventing oil from spraying out from the vent 12 of the equipment.

[0052] It can be understood that the large diameter of the mounting seat 6 can enable the installed second elastic member 41 to be arranged around the valve rod 5 and have a distance between the valve rod 5, the second elastic member 41 abuts against the edge of the second through hole 32 of the valve plate 3, and the second elastic member 41 is located in the first elastic member 31. The large diameter of the valve head 51 can enable the valve head 51 to block the second through hole 32. The small diameter of the valve rod 5 can enable the valve rod 5 to have a second gap 33 between the valve rod 5 and the inner wall of the second through hole 32, so as to facilitate the valve rod 5 to shuttle in the second through hole 32, and the second gap 33 can also flow gas.

[0053] In Figure 2 the embodiment, the valve head 51, the valve rod 5 and the mounting seat 6 of the intake valve 4 are integrally formed. While in Figure 3 the embodiment, the valve rod 5 and the valve head 51 of the intake valve 4 are integrally formed, and the mounting seat 6 is detachably mounted at the end of the intake valve 4 away from the valve head 51. In this way, the valve rod 5 can be first penetrated by the valve plate 3, and then the mounting seat 6 is mounted on the valve rod 5, so as to facilitate the installation of the whole intake valve 4.

[0054] Specifically, as Figure 4 shown, the valve rod 5 of the intake valve 4 is provided with a plurality of mounting portions 52 along the edge at one end of the valve head 51, and the middle part between the plurality of mounting portions 52 has a gap 54. The mounting portion 52 is an elastic member, which can be gathered to the middle gap 54 when subjected to force, so as to connect the mounting seat 6. The end of the mounting portion 52 is provided with a clamping portion 53, which protrudes outwardly along the radial direction of the mounting portion 52. Further, the diameter of the clamping portion 53 gradually decreases from the position close to the mounting portion 52 to the end thereof.

[0055] As Figure 5 shown, the middle part of the mounting seat 6 is provided with a third through hole 61, and the third through hole 61 is provided with a second boss 62 protruding inwardly. The middle part of the second boss 62 has a middle through hole 64 coaxial with the third through hole 61. The outer peripheral top surface of the mounting seat 6 is provided with a third boss 63 extending outwardly therefrom. Figure 6 It can be seen that the third boss 63 is used for mounting and connecting the second elastic member 41.

[0056] When the mounting seat 6 is mounted with the valve rod 5, as Figure 6 shown, the clamping portion 53 of the valve rod 5 extends into the third through hole 61 and is extruded by the inner wall of the middle through hole 64 of the second boss 62 in the third through hole 61, and the clamping portion 53 of the valve rod 5 is gathered with the mounting portion 52 to the middle gap 54, so that the diameter of the mounting portion 52 is reduced to pass through the middle through hole 64 of the second boss 62. After passing through the middle through hole 64 of the second boss 62, the extrusion force on the clamping portion 53 and the mounting portion 52 of the valve rod 5 is eliminated, and the clamping portion 53 rebounds outwardly, and the clamping portion 53 is clamped in the third through hole 61 and abuts against the second boss 62, so as to prevent the mounting seat 6 from falling off the valve rod 5.

[0057] The diameter of the clamping portion 53 is gradually reduced towards the end portion, which makes the clamping portion 53 more convenient to enter the middle through hole 64 of the second boss 62 inside the third through hole 61.

[0058] When disassembling, the mounting portion 52 is gathered towards the middle gap 54, the diameter of the valve rod 5 is compressed to be smaller than the diameter of the middle through hole 64 of the second boss 62, and then the third through hole 61 is withdrawn.

[0059] The air vent device of the utility model can carry out independent air intake or exhaust through the internal and external air pressure difference of the equipment.

[0060] The exhaust process of the air vent device is as shown in Figure 7 When the gas pressure inside the equipment is greater than the external gas pressure, the gas inside the equipment flows to the air vent 12 through the first through hole 11 of the valve seat 1 as shown by the arrow in the figure, and acts on the valve piece 3 located at the air vent 12 and the air inlet valve 4 installed on the valve piece 3, so that the valve piece 3 extrudes the first elastic member 31 to move axially away from the valve seat 1. At this time, the gas pressure overcomes the elastic force of the first elastic member 31, and since the overall structure of the air inlet valve 4 is completely installed on the valve piece 3, when subjected to the gas pressure, the valve piece 3 can move together with the air inlet valve 4 away from the valve seat 1 to open the air vent 12, so that the first through hole 11 is completely opened. The gas enters the inside of the air vent cover 21 through the air vent 12, and is discharged to the outside through the gap between the first gap 23 and the multiple abutting portions 22.

[0061] With the exhaust of the gas, the gas pressure inside the equipment gradually decreases until the gas pressure inside the equipment is balanced with the external gas pressure. In this process, the elastic force of the first elastic member 31 gradually presses the valve piece 3 together with the air inlet valve 4 back to the edge of the air vent 12 until the air vent 12 is blocked.

[0062] The air intake process of the air vent device is as shown in Figure 8As shown, when the gas pressure in the device is less than the external gas pressure, i.e. a negative pressure is generated in the device. The external gas, as shown by the arrow, enters the inside of the vent cap 21 through the gap between the multiple abutting portions 22 of the vent cap 21, enters the inside of the vent cap 21 from the first gap 23, and acts on the air inlet valve 4 to press the air inlet valve 4 against the second elastic member 41. The external gas overcomes the elastic force of the second elastic member 41 and drives the air inlet valve 4 to move axially towards the valve seat 1, the valve rod 5 moves axially in the second through hole 32 towards the valve seat 1, and the valve head 51 is driven to move away from the second through hole 32 to open the second through hole 32. The gas flows from the second gap 33 between the valve rod 5 and the inner wall of the second through hole 32 to the first through hole 11 through the vent hole 12, and then enters the inside of the device.

[0063] With the entry of the gas, the negative pressure of the gas in the device gradually decreases until the gas pressure in the device is balanced with the external gas pressure. During this process, the valve sheet 3 is always pressed against the edge of the vent hole 12, and the elastic force of the second elastic member 41 gradually presses the valve head 51 of the air inlet valve 4 away from the valve seat 1 and back to the edge of the second through hole 32 on the side of the valve sheet 3 facing the valve seat 1 until the second through hole 32 is blocked.

[0064] During the foregoing exhaust process and the air inlet process, the abutting portion 22 of the vent cap 21 is always abutted against the bottom end of the first boss 13 of the valve seat 1 to prevent the vent cap 21 from being detached from the valve seat 1 by the elastic force of the first elastic member 31.

[0065] The air inlet valve 4 of the venting device of the utility model is installed on the side of the valve sheet 3 away from the valve seat 1 through the second elastic member 41, and the vent cap 21 is also connected to the side of the valve sheet 3 away from the valve seat 1 through the first elastic member 31, i.e. the air inlet valve 4, the vent cap 21 and the valve sheet 3 of the vent valve 2 form an integral structure after assembly, so that the vent valve 2 is conveniently installed on or detached from the valve seat 1. When installing, the valve sheet 3 of the vent valve 2 is covered on the vent hole 12 of the valve seat 1, and the abutting portion 22 of the vent cap 21 is abutted against the bottom end of the first boss 13 of the valve seat 1, and the installation is completed. When disassembling, only the abutting portion 22 of the vent cap 21 is separated from the bottom end of the first boss 13 of the valve seat 1, and the vent cap 21 is removed to make the valve sheet 3 away from the vent hole 12 of the valve seat 1, and the disassembly is completed.

[0066] The venting device of the utility model can also adjust the opening pressure of the valve sheet 3 by adjusting the elastic force of the first elastic member 31, and the exhaust opening pressure can be set according to actual needs, for example, the transmission is set to about 0.2-0.3 ba. Similarly, by adjusting the elastic force of the second elastic member 41, the opening pressure of the air inlet valve 4 can be adjusted, and the air inlet pressure can be set according to actual needs, for example, the transmission is set to about 0.2-0.3 ba.

[0067] The valve piece 3 and the air inlet valve 4 of the air vent device of the utility model can prevent the oil liquid in the equipment from spraying out and also prevent the liquid outside the equipment from entering the equipment. Moreover, the air vent device of the utility model can open the valve piece 3 to exhaust or open the air inlet valve 4 to inhale according to the gas pressure difference between the inside and outside of the equipment, so as to realize the self-dual air exchange function, thereby ensuring the pressure balance between the inside and outside of the equipment, preventing the pressure from damaging the parts inside the equipment and increasing the reliability of the equipment.

[0068] The utility model also provides a transmission, and the transmission has each feature of the aforementioned air vent device, and thus has the corresponding advantages.

[0069] The technical range of the utility model is not limited to the content in the foregoing description, and the person skilled in the art can make various modifications and changes to the foregoing embodiment without departing from the technical thought of the utility model, and these modifications and changes should all belong to the range of the utility model.

Claims

1. A ventilation device, characterized in that The ventilation device includes a valve seat (1) and a ventilation valve (2) located at the ventilation port (12) of the valve seat (1). The vent valve (2) includes a vent cover (21) covering the valve seat (1) and a valve plate (3) connected to the vent cover (21) via a first elastic element (31). The valve plate (3) can open or block the vent (12). The valve plate (3) is provided with a second through hole (32) communicating with the vent (12). An air inlet valve (4) is provided at the second through hole (32). The air inlet valve (4) is elastically installed on the side of the valve plate (3) away from the valve seat (1) by a second elastic member (41), so that part of the air inlet valve (4) is located between the vent cover (21) and the valve plate (3), and the other part of the air inlet valve (4) can open or block the second through hole (32).

2. The vent of claim 1, wherein The intake valve (4) includes a valve stem (5) that passes through the second through hole (32) and mounting seats (6) and valve heads (51) respectively located at both ends of the valve stem (5); The mounting base (6) is connected to the side of the valve plate (3) away from the valve seat (1) via the second elastic element (41), and the valve head (51) is located on the other side of the valve plate (3) and can abut against the edge of the vent (12) to block the vent (12).

3. The vent of claim 2, wherein The diameter of the mounting base (6) and the valve head (51) is greater than the diameter of the valve stem (5) and the second through hole (32), and the diameter of the valve stem (5) is smaller than the diameter of the second through hole (32). The intake valve (4) forms an "I" shaped structure with a cross-section that is wide at both ends and narrow in the middle. The valve head (51), the valve stem (5) and the mounting base (6) of the intake valve (4) are integrally formed parts.

4. The vent of claim 2, wherein The valve stem (5) and valve head (51) of the intake valve (4) are integrally formed, and the mounting base (6) is detachably installed on the end of the valve stem (5).

5. The vent of claim 3, wherein The mounting end of the mounting base (6) of the valve stem (5) is provided with a plurality of elastic mounting parts (52), and there is a gap (54) between the plurality of mounting parts (52). The end of the mounting part (52) is provided with a snap-fit ​​part (53) protruding outward. The mounting base (6) is provided with a third through hole (61), and a second boss (62) is provided on the inner circumference of the third through hole (61). The snap-fit ​​part (53) can snap onto the second boss (62). The second boss (62) has a central through hole (64) coaxial with the third through hole (61) in the middle. The clamping portion (53) can extend into the middle through hole (64) and be pressed by the inner wall of the middle through hole (64), and the mounting portion (52) is elastically gathered to the gap (54) together, so that the diameter of the mounting portion (52) is reduced to pass through the middle through hole (64), and then the clamping portion (53) and the mounting portion (52) are eliminated to the outward rebound of the extrusion force, the clamping portion (53) is clamped in the third through hole (61), and abuts against the second boss (62).

6. The vent of claim 5, wherein The diameter of the clamping portion (53) gradually decreases from the position close to the mounting portion (52) to the end portion in the axial direction.

7. The vent of claim 3, wherein The outer peripheral top surface of the mounting seat (6) is provided with a third boss (63) extending to the outer periphery thereof, and the third boss (63) is connected to the second elastic member (41).

8. The vent of claim 1, wherein The end portion of the vent cover (21) is provided with an inwardly protruding abutting portion (22), the abutting portion (22) is wedge-shaped, and the abutting portion (22) abuts against the outer wall of the valve seat (1).

9. The vent of claim 8, wherein, The edge of the vent (12) of the valve seat (1) extends outwardly with a first boss (13), and the abutting portion (22) abuts against one side of the first boss (13) away from the vent (12).

10. A transmission characterized by, The transmission has the venting device as claimed in any one of claims 1-9.

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