Transmission shell structure and transmission

Abstract

The utility model provides a transmission shell structure and a transmission, and belongs to the technical field of transmissions, the transmission shell structure comprises a main shell and a ventilation plug provided with a single-layer film, the main shell is internally provided with an internal oil blocking condensation channel, and the outer wall of the main shell is internally provided with an external oil blocking condensation channel; the internal oil-blocking condensation channel and the external oil-blocking condensation channel are communicated through a communicating hole; the built-in oil-blocking condensation channel and the external oil-blocking condensation channel are used for blocking oil and condensing oil gas together, and the external oil-blocking condensation channel is cooled through air cooling so as to continuously condense the oil gas. The transmission shell structure provided by the utility model is provided with the built-in oil-blocking condensation channel and the external oil-blocking condensation channel, so that the volume of an independently arranged built-in oil-blocking structure can be reduced, and the operability of an oil-blocking function is improved. Meanwhile, the external oil-blocking condensation channel can keep the condensation effect on oil gas through continuous air cooling, and the problem that a single-layer film of the ventilation plug loses efficacy is avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of transmissions, and more specifically, relates to a transmission housing structure and a transmission. Background Art

[0002] At present, the development of new energy has occupied part of the market. Transmissions, especially DHT or EAD reducers, need to use oil-blocking and waterproof breather plugs, which can realize both breathability and waterproof functions. Some emerging parts manufacturers have overcome various technical difficulties and realized the preliminary model of this breathability function. This model can isolate the corrosion of a small amount of oil and gas, but if there is oil throwing or large amount of oil and gas inside the transmission, it will still cause the breather plug to fail. Therefore, it is necessary to block the oil throwing and oil and gas condensation inside the shell.

[0003] In the prior art, an oil retaining structure is usually set inside the gearbox housing to prevent oil from splashing out. In order to ensure the oil retaining effect, the oil retaining structure is usually designed to be very large, resulting in the overall size of the transmission being too large, affecting the loading of the entire external engine compartment. In addition, as the temperature inside the transmission rises, the internal oil retaining structure will lose its condensation effect on the oil and gas, and it will not be able to achieve complete and continuous condensation of the oil and gas. There is still the problem of high oil and gas content in the exhaust gas causing the single-layer membrane of the vent plug to fail. Utility Model Content

[0004] The purpose of the utility model is to provide a transmission housing structure, aiming to solve the problem that an oil retaining structure is set inside the transmission housing, which will increase the volume of the transmission housing as a whole; and the internal oil retaining structure will cause the condensation effect of oil and gas to decrease as the internal temperature of the transmission increases, eventually leading to the failure of the single-layer membrane of the vent plug.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: to provide a transmission housing structure, including a main housing and a vent plug installed with a single-layer membrane, the interior of the main housing is provided with a built-in oil-blocking condensation channel, the outer wall of the main housing is provided with an external oil-blocking condensation channel, the built-in oil-blocking condensation channel and the external oil-blocking condensation channel are connected through a connecting hole, the built-in oil-blocking condensation channel is connected to the inner cavity of the main housing, and the vent plug is connected to the external oil-blocking condensation channel;

[0006] The built-in oil blocking condensation channel and the external oil blocking condensation channel are used to jointly block the oil and condense the oil gas, and the external oil blocking condensation channel is cooled by air cooling to continuously condense the oil gas.

[0007] In a possible implementation, the built-in oil-blocking condensation channel is provided with a plurality of built-in oil-blocking ribs, and the plurality of built-in oil-blocking ribs are arranged in sequence and spaced apart along the length direction of the built-in oil-blocking condensation channel. Built-in condensation chambers are formed on both sides of any built-in oil-blocking rib, and the built-in condensation chamber at one end of the built-in oil-blocking condensation channel is connected to the inner cavity of the main shell, and the built-in condensation chamber at the other end of the built-in oil-blocking condensation channel is connected to the connecting hole.

[0008] In a possible implementation, the external oil-blocking condensation channel is provided with a plurality of external oil-blocking ribs, and the plurality of external oil-blocking ribs are alternately arranged up and down in sequence along the length direction of the internal oil-blocking condensation channel, and external condensation cavities are formed on both sides of any external oil-blocking rib, one end of the external oil-blocking condensation channel is connected to the connecting hole, and the other end of the external oil-blocking condensation channel is connected to the vent plug.

[0009] In one possible implementation, a first protrusion is provided on the outer side of one end of the external oil retaining condensation channel close to the connecting hole, and a first boss is provided on the inner side of one end of the external oil retaining condensation channel close to the connecting hole. The connecting hole is axially penetrated and opened on the first boss. The first protrusion is arranged opposite to the connecting hole and forms a first ventilation gap circumferentially at the outlet end of the connecting hole.

[0010] In a possible implementation, an extension sleeve is provided on the outer side of one end of the external oil-blocking condensation channel close to the connecting hole, and the extension sleeve is arranged around the outer periphery of the first boss, and a second ventilation gap is formed between the extension sleeve and the first boss.

[0011] In one possible implementation, a second boss is provided on the inner side of one end of the external oil condensation blocking channel close to the vent plug, the upper end of the second boss is inserted into the bottom of the vent plug, and a third ventilation gap is formed between the second boss and the vent plug.

[0012] In one possible implementation, an external groove is provided on the outer wall of the main shell, an external cover plate is detachably installed on the outer side of the external groove, the external oil condensation blocking channel is formed between the external cover plate and the external groove, the connecting hole is connected to the bottom of one end of the external groove, and the vent plug is connected to the other end of the external cover plate.

[0013] In a possible implementation, a plurality of baffles are disposed at the bottom of the vent plug, and the plurality of baffles are alternately disposed on both sides of the inner cavity of the vent plug.

[0014] In a possible implementation, an oil absorption layer is provided on the top of the vent plug, and the oil absorption layer is located below the single-layer membrane and is used for absorbing oil and gas in the exhaust gas.

[0015] The beneficial effect of a transmission housing structure provided by the utility model is that: compared with the prior art, the built-in oil-blocking condensation channel inside the main housing and the external oil-blocking condensation channel inside the outer wall of the main housing are connected through a connecting hole, wherein the built-in oil-blocking condensation channel is connected to the inner cavity of the main housing, and the external oil-blocking condensation channel is connected to the vent plug. Therefore, the built-in oil-blocking condensation channel, the connecting hole and the external oil-blocking condensation channel form a channel connecting the inner cavity of the main housing and the vent plug, and the built-in oil-blocking condensation channel and the external oil-blocking condensation channel jointly block the oil and condensed oil gas, avoiding the oil and oil gas from entering the vent plug and causing the single-layer membrane to fail. At the same time, during the operation of the vehicle, the outside of the main housing forms a continuous air-cooling effect and acts on the external oil-blocking condensation channel to ensure that the external oil-blocking condensation channel continues to condense oil gas. The transmission housing structure provided by the utility model has both a built-in oil-blocking condensation channel and an external oil-blocking condensation channel. Compared with the prior art in which only a built-in oil-blocking structure is set, the volume of the built-in oil-blocking structure set separately can be reduced, and the operability of the oil-blocking function is increased. At the same time, the external oil-blocking condensation channel can also maintain the condensation effect on oil and gas through continuous air cooling, avoiding the problem of single-layer membrane failure of the vent plug.

[0016] The utility model also provides a transmission, comprising the transmission housing structure.

[0017] The utility model also provides a transmission with the following beneficial effects: compared with the prior art, the transmission uses the above-mentioned transmission housing structure, and therefore has the same beneficial effects as the transmission housing structure. The transmission has both a built-in oil-blocking condensation channel and an external oil-blocking condensation channel. Compared with the prior art that only has a built-in oil-blocking structure, the volume of the built-in oil-blocking structure alone can be reduced, and the operability of the oil-blocking function is increased. At the same time, the external oil-blocking condensation channel can also maintain the condensation effect on the oil and gas through continuous air cooling, avoiding the problem of failure of the single-layer membrane of the vent plug. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 A side view of the main housing provided by the utility model;

[0020] Figure 2 for Figure 1 A partial cross-sectional view along the middle edge GG;

[0021] Figure 3 for Figure 2 A partial enlarged view of the M in the middle;

[0022] Figure 4 This is a schematic structural diagram of the vent plug provided by the utility model.

[0023] Description of reference numerals:

[0024] 100. Main shell;

[0025] 200, built-in oil-blocking condensation channel; 210, built-in oil-blocking rib; 220, built-in condensation chamber;

[0026] 300, external oil blocking condensation channel; 310, external oil blocking rib; 320, external condensation chamber; 330, first protrusion; 340, first boss; 341, first ventilation gap; 350, extension sleeve; 351, second ventilation gap; 360, second boss; 361, third ventilation gap; 362, groove; 370, external cover plate; 371, connecting bolt;

[0027] 400, vent plug; 410, single-layer membrane; 420, baffle; 430, oil absorption layer; 440, sealing ring;

[0028] 500. Connecting hole. DETAILED DESCRIPTION

[0029] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0030] In the claims, specification and the above-mentioned drawings of the utility model, unless otherwise clearly defined, the use of terms such as "first", "second" or "third" etc. is to distinguish different objects rather than to describe a specific order.

[0031] In the claims, specification and the above-mentioned drawings of the utility model, unless otherwise explicitly defined, directional words, such as the terms "center", "lateral", "longitudinal", "horizontal", "vertical", "top", "bottom", "inside", "outside", "up", "down", "front", "back", "left", "right", "clockwise", "counterclockwise", "high", "low", etc., indicating directions or positional relationships are based on the directions and positional relationships shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the specific protection scope of the utility model.

[0032] See also Figure 1 and Figure 2 , a transmission housing structure provided by the utility model is now described. A transmission housing structure includes a main housing 100 and a vent plug 400 installed with a single-layer membrane 410, a built-in oil-blocking condensation channel 200 is arranged inside the main housing 100, an external oil-blocking condensation channel 300 is arranged inside the outer wall of the main housing 100, the built-in oil-blocking condensation channel 200 and the external oil-blocking condensation channel 300 are connected through a connecting hole 500, the built-in oil-blocking condensation channel 200 is connected to the inner cavity of the main housing 100, and the vent plug 400 is connected to the external oil-blocking condensation channel 300; the built-in oil-blocking condensation channel 200 and the external oil-blocking condensation channel 300 are used to jointly block oil and condense oil gas, and the external oil-blocking condensation channel 300 is cooled by air cooling to continuously condense oil gas.

[0033] The utility model provides a transmission housing structure. Compared with the prior art, the built-in oil-blocking condensation channel 200 inside the main housing 100 and the external oil-blocking condensation channel 300 inside the outer wall of the main housing 100 are connected through a connecting hole 500, wherein the built-in oil-blocking condensation channel 200 is connected to the inner cavity of the main housing 100, and the external oil-blocking condensation channel 300 is connected to the vent plug 400. Therefore, the built-in oil-blocking condensation channel 200, the connecting hole 500 and the external oil-blocking condensation channel 300 form a channel connecting the inner cavity of the main housing 100 and the vent plug 400, and the built-in oil-blocking condensation channel 200 and the external oil-blocking condensation channel 300 jointly block the oil and condensed oil gas, and prevent the oil and oil gas from entering the vent plug 400 and causing the single-layer film 410 to fail. At the same time, during the operation of the vehicle, the outside of the main housing 100 forms a continuous air-cooling effect and acts on the external oil-blocking condensation channel 300 to ensure that the external oil-blocking condensation channel 300 continuously condenses oil gas. The utility model provides a transmission housing structure, which has both a built-in oil blocking condensation channel 200 and an external oil blocking condensation channel 300. Compared with the prior art that only sets a built-in oil blocking structure, it can reduce the volume of the built-in oil blocking structure alone and increase the operability of the oil blocking function. At the same time, the external oil blocking condensation channel 300 can also maintain the condensation effect on oil and gas through continuous air cooling, avoiding the problem of failure of the single-layer membrane 410 of the vent plug 400.

[0034] It is worth noting that the main housing 100 in the present application is one of the two housings of the reducer that are opposite to each other and is an integrally cast component. The single-layer membrane 410 is a breathable and waterproof membrane that allows gas to pass through while blocking liquid from passing through.

[0035] See also Figures 2 to 3The built-in oil-blocking condensation channel 200 is provided with a plurality of built-in oil-blocking ribs 210, which are sequentially arranged at intervals along the length direction of the built-in oil-blocking condensation channel 200. The built-in oil-blocking ribs 210 are trapezoidal ribs, and the built-in oil-blocking ribs 210 are integrally formed inside the built-in oil-blocking condensation channel 200. The plurality of built-in oil-blocking ribs 210 can block most of the splashing oil, and only a small amount of oil enters the connecting hole 500.

[0036] Built-in condensation chambers 220 are formed on both sides of any built-in oil retaining rib 210 , respectively. Misty oil and gas diffuse into the built-in condensation chamber 220 , and the oil and gas condense into oil liquid in the built-in condensation chamber 220 and fall back into the inner cavity of the main shell 100 .

[0037] The built-in condensation chamber 220 at one end of the built-in oil blocking condensation channel 200 is provided with an air inlet, which is connected to the inner cavity of the main shell 100, and the built-in condensation chamber 220 at the other end of the built-in oil blocking condensation channel 200 is provided with the above-mentioned connecting hole 500, which is connected to the external oil blocking condensation channel 300 through the connecting hole 500. The air inlet and the connecting hole 500 are respectively opened at both ends of the built-in oil blocking condensation channel 200. The oil and oil gas inside the main shell 100 need to pass through multiple built-in oil blocking ribs 210 and multiple built-in condensation chambers 220 in turn before they can enter the external oil blocking condensation channel 300 through the connecting hole 500, which can more effectively block the oil and condensed oil gas.

[0038] Please participate Figure 3 The external oil-blocking condensation channel 300 is provided with a plurality of external oil-blocking ribs 310, and the plurality of external oil-blocking ribs 310 are arranged alternately up and down in sequence along the length direction of the external oil-blocking condensation channel 300. The plurality of external oil-blocking ribs 310 are respectively integrally formed on the upper side and the lower side of the external oil-blocking condensation channel 300. The plurality of external oil-blocking ribs 310 located on the upper side and the lower side are arranged alternately in sequence, and the length of the external oil-blocking ribs 310 is less than the height of the external oil-blocking condensation channel 300 and greater than half the height of the external oil-blocking condensation channel 300. In this way, the plurality of external oil-blocking ribs 310 arranged alternately up and down in sequence can form a repeatedly bent channel in the external oil-blocking condensation channel 300, and the external oil-blocking ribs 310 can further block a small amount of oil entering the external oil-blocking condensation channel 300 through the connecting hole 500.

[0039] An external condensation chamber 320 is formed on both sides of any external oil-blocking rib 310. A small amount of oil and gas enters the external oil-blocking condensation channel 300 through the connecting hole 500 and passes through multiple external condensation chambers 320 one by one when passing through the repeatedly bent channel. The oil and gas will also be condensed in the external condensation chamber 320, thereby further eliminating the oil and gas content.

[0040] In addition, during the driving process of the vehicle, a continuous air-cooling effect is formed on the outside of the main shell 100 and acts on multiple external condensation chambers 320, which can continuously cool the external condensation chambers 320 and maintain the condensation effect of the external condensation chambers 320 on oil and gas.

[0041] One end of the external oil blocking condensation channel 300 is connected to the above-mentioned connecting hole 500, and the other end of the external oil blocking condensation channel 300 is connected to the vent plug 400. The built-in oil blocking condensation channel 200, the connecting hole 500 and the external oil blocking condensation channel 300 form an overall exhaust channel. Compared with the method of only using the built-in exhaust channel, the overall path is longer and the effect of blocking oil and condensing oil gas is better. Of course, when the overall path is the same, the length of the built-in oil blocking condensation channel 200 can also be compensated by the external oil blocking condensation channel 300 to reduce the volume of the built-in oil blocking condensation channel 200, thereby reducing the internal space and overall size of the transmission.

[0042] A first protrusion 330 is provided on the outer side of one end of the external oil blocking condensation channel 300 close to the connecting hole 500, and a first boss 340 is provided on the inner side of one end of the external oil blocking condensation channel 300 close to the connecting hole 500. The first boss 340 is a cylindrical boss, and the connecting hole 500 is coaxially opened in the above cylindrical boss. The lower end of the first protrusion 330 has a spherical end, and the upper end of the connecting hole 500 has a flared end. The spherical end portion of the first protrusion 330 is inserted into the flared end of the connecting hole 500. The outer periphery of the spherical end and the circumference of the flared end form a first ventilation gap 341. The first ventilation gap 341 can block the oil and oil gas passing through the vent hole, and reduce the content of oil and oil gas entering the external oil blocking condensation channel 300. In addition, the vent hole has a smaller aperture than the built-in condensation chamber 220 connected thereto, and can also block the oil and oil gas.

[0043] Furthermore, an extension sleeve 350 is provided on the outer side of one end of the external oil blocking condensation channel 300 close to the connecting hole 500. The extension sleeve 350 is arranged around the outer periphery of the first boss 340. The extension sleeve 350 and the first boss 340 are arranged coaxially. The inner diameter of the extension sleeve 350 is larger than the outer diameter of the second boss 360. The extension sleeve 350 extends downward and is sleeved on the outer side of the first boss 340. A second ventilation gap 351 with the same circumferential size is formed between the extension sleeve 350 and the first boss 340. The second ventilation gap 351 can block the oil and oil gas passing through the first ventilation gap 341, thereby further reducing the content of oil and oil gas entering the external oil blocking condensation channel 300.

[0044] See also Figure 3A second boss 360 is provided on the inner side of one end of the external oil blocking condensation channel 300 close to the vent plug 400. The second boss 360 is also a cylindrical platform. The upper end of the second boss 360 is coaxially inserted into the bottom of the vent plug 400, and a third ventilation gap 361 is formed between the outer wall of the second boss 360 and the inner wall of the vent plug 400. The third ventilation gap 361 can block the oil and oil gas entering the vent plug 400, and finally reduce the oil and oil gas entering the vent plug 400 through the external oil blocking condensation channel 300.

[0045] In addition, a groove 362 is coaxially arranged on the upper end surface of the second boss 360, and a small amount of oil and oil gas entering the bottom of the vent plug 400 can be retained in the groove 362 after further blocking and condensation, thereby avoiding backflow to the external oil blocking condensation channel 300.

[0046] See also Figure 3 An external groove is provided on the outer wall of the main shell 100, and an external cover plate 370 is detachably installed on the outer side of the external groove. The outer contour of the external cover plate 370 is larger than the outer contour of the external groove. The external cover plate 370 is completely buckled on the outside of the external groove and can completely close the external groove. An external oil blocking condensation channel 300 is formed between the external cover plate 370 and the external groove, and a sealing gasket is used for sealing to ensure the sealing of the external oil blocking condensation channel 300.

[0047] Specifically, the external cover plate 370 is detachably connected to the outer side of the external tank via the connecting bolts 371, so as to facilitate the disassembly and assembly of the external cover plate 370 and timely clean the residual oil in the external tank.

[0048] Among them, the connecting hole 500 is connected to the bottom of one end of the external groove, and a threaded hole is provided at one end of the external cover plate 370 away from the connecting hole 500. The vent plug 400 is installed on the external cover plate 370 through the threaded hole and is connected to the external oil condensation blocking channel 300. The threaded hole for installing the vent plug 400 is set separately from the connecting hole 500, which provides great space and operability for the installation of the vent plug 400. The outer periphery of the vent plug 400 is provided with an assembly surface, and an annular groove is provided in the circumference of the assembly surface. A sealing ring 440 is provided in the annular groove. When the vent plug 400 is threadedly installed on the external cover plate 370, the assembly surface presses the sealing ring 440 against the outer side surface of the external cover plate 370 to ensure the sealing of the vent plug 400.

[0049] See also Figure 4The bottom of the vent plug 400 is provided with a plurality of baffles 420, which are arranged alternately on both sides of the inner cavity of the vent plug 400. The length of the baffle 420 is greater than half of the diameter of the lower part of the inner cavity of the vent plug 400. The plurality of baffles 420 form a channel that bends upwards reciprocatingly. The plurality of baffles 420 can further prevent the oil and oil gas from reaching the one-way membrane of the vent plug 400, effectively protecting the one-way membrane. The oil or oil gas blocked by the baffle 420 will flow into the groove 362 on the upper end surface of the second boss 360 under gravity for storage.

[0050] In addition, an oil absorption layer 430 is provided on the top of the vent plug 400. The oil absorption layer 430 is located below the unidirectional membrane. The oil absorption layer 430 is oil-gas absorption cotton. The oil-gas absorption cotton is made of oleophilic ultrafine fiber fabric and can quickly absorb oil liquid dozens of times its own weight, and finally remove the oil and gas mixed in the gas.

[0051] Based on the same inventive concept, the utility model also provides a transmission, which uses the above-mentioned transmission housing structure, and thus has the same beneficial effects as the transmission housing structure. The transmission is provided with both a built-in oil-blocking condensation channel 200 and an external oil-blocking condensation channel 300. Compared with the prior art that only provides a built-in oil-blocking structure, the volume of the built-in oil-blocking structure alone can be reduced, and the operability of the oil-blocking function is increased. At the same time, the external oil-blocking condensation channel 300 can also maintain the condensation effect on the oil and gas through continuous air cooling, avoiding the problem of failure of the single-layer membrane 410 of the vent plug 400.

[0052] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A transmission housing structure, characterized in that: The invention comprises a main shell (100) and a vent plug (400) installed with a single-layer membrane (410); a built-in oil-blocking condensation channel (200) is arranged inside the main shell (100); an external oil-blocking condensation channel (300) is arranged inside the outer wall of the main shell (100); the built-in oil-blocking condensation channel (200) and the external oil-blocking condensation channel (300) are connected through a connecting hole (500); the built-in oil-blocking condensation channel (200) is connected to the inner cavity of the main shell (100); and the vent plug (400) is connected to the external oil-blocking condensation channel (300); The internal oil blocking condensation channel (200) and the external oil blocking condensation channel (300) are used to block oil liquid and condense oil gas together, and the external oil blocking condensation channel (300) is cooled by air cooling to continuously condense oil gas.

2. A transmission housing structure as claimed in claim 1, characterized in that: The built-in oil-blocking condensation channel (200) is provided with a plurality of built-in oil-blocking ribs (210) therein, and the plurality of built-in oil-blocking ribs (210) are sequentially spaced apart along the length direction of the built-in oil-blocking condensation channel (200), and built-in condensation chambers (220) are respectively formed on both sides of any of the built-in oil-blocking ribs (210), and the built-in condensation chamber (220) at one end of the built-in oil-blocking condensation channel (200) is connected to the inner cavity of the main shell (100), and the built-in condensation chamber (220) at the other end of the built-in oil-blocking condensation channel (200) is connected to the connecting hole (500).

3. A transmission housing structure as claimed in claim 1, characterized in that: The external oil-blocking condensation channel (300) is provided with a plurality of external oil-blocking ribs (310) inside, and the plurality of external oil-blocking ribs (310) are arranged alternately up and down in sequence along the length direction of the internal oil-blocking condensation channel (200), and external condensation chambers (320) are formed on both sides of any external oil-blocking rib (310), one end of the external oil-blocking condensation channel (300) is connected to the connecting hole (500), and the other end of the external oil-blocking condensation channel (300) is connected to the vent plug (400).

4. A transmission housing structure as claimed in claim 1, characterized in that: A first protrusion (330) is arranged on the outer side of one end of the external oil blocking condensation channel (300) close to the connecting hole (500), and a first boss (340) is arranged on the inner side of one end of the external oil blocking condensation channel (300) close to the connecting hole (500). The connecting hole (500) is axially through-opened on the first boss (340), and the first protrusion (330) is arranged opposite to the connecting hole (500) and forms a first ventilation gap (341) circumferentially at the outlet end of the connecting hole (500).

5. A transmission housing structure as claimed in claim 4, characterized in that: An extension sleeve (350) is arranged on the outer side of one end of the external oil-blocking condensation channel (300) close to the connecting hole (500), and the extension sleeve (350) is arranged around the outer periphery of the first boss (340), and a second ventilation gap (351) is formed between the extension sleeve (350) and the first boss (340).

6. A transmission housing structure as claimed in claim 1, characterized in that: A second boss (360) is provided on the inner side of one end of the external oil condensation blocking channel (300) close to the vent plug (400); the upper end of the second boss (360) is inserted into the bottom of the vent plug (400); and a third ventilation gap (361) is formed between the second boss (360) and the vent plug (400).

7. A transmission housing structure as claimed in claim 1, characterized in that: The outer wall of the main shell (100) is provided with an external groove, and an external cover plate (370) is detachably installed on the outer side of the external groove. The external oil condensation blocking channel (300) is formed between the external cover plate (370) and the external groove. The connecting hole (500) is connected to the bottom of one end of the external groove, and the vent plug (400) is connected to the other end of the external cover plate (370).

8. A transmission housing structure as claimed in claim 1, characterized in that: A plurality of baffles (420) are arranged at the bottom of the vent plug (400), and the plurality of baffles (420) are arranged alternately and relatively on both sides of the inner cavity of the vent plug (400).

9. A transmission housing structure as claimed in claim 1, characterized in that: An oil absorption layer (430) is provided on the top of the vent plug (400), and the oil absorption layer (430) is located below the single-layer membrane (410) and is used to absorb oil and gas in the exhaust gas.

10. A transmission, characterized in that: It comprises a transmission housing structure as described in any one of claims 1-9.

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