A gear box lubrication system and a transmission gear box

Abstract

The application discloses a kind of gear box lubricating system and transmission gear box, by being equipped with oil baffle in the bearing hole inside gear box and forming lubricating chamber, it can quickly collect and store a certain amount of lubricating oil to lubricate bearing, improve the long-term lubrication of lubricating oil in lubricating chamber to bearing after starting;And lubricating oil can flow into gear box bottom oil tank through the oil return hole of lubricating chamber, take away part of heat and fine impurities in bearing, realize the circulation and lubrication of oil liquid;Meanwhile, longitudinal oil baffle is arranged at the bottom of gear box, when gear rotates at high speed in oil stirring chamber, oil liquid in oil stirring chamber reduces quickly, and the oil in oil storage chamber is supplemented to oil stirring chamber through opening, so that the problem that bearing is burned due to parking and starting and oil stirring is not timely and fully supplemented is avoided.

Description

Technical Field

[0001] This invention relates to the technical field of transmission gearboxes and lubrication systems for rail transit machinery, and more specifically, to a gearbox lubrication system and a transmission gearbox. Background Technology

[0002] Currently, most railcar gearboxes employ either a single-stage gearbox transmission method with bevel gear input and disc gear output, or a two-stage transmission method with cylindrical gear input and bevel gear output. Both of these transmission methods are vertical transmissions and rely heavily on a pair of bevel gears. However, the design and manufacturing of bevel gears are far more difficult than those of cylindrical gears, and processing resources are scarce, making it difficult to find suitable suppliers. Inspection and testing resources are also limited, resulting in high testing costs, which significantly increases the cost of the gearbox and the product development cycle. In contrast, parallel shaft two-stage transmission gearboxes are low-cost and have a short development cycle, and are becoming increasingly widely used in railcars when using motor-driven gearboxes.

[0003] Parallel shaft two-stage transmission gearboxes have advantages such as simple structure, short design cycle, abundant processing resources, easy quality assurance, and low manufacturing and maintenance costs. Their application prospects in railcars are increasingly promising. However, railcar gearboxes are generally large in size, resulting in a significant distance between the bearings and the oil surface, leading to insufficient lubrication and directly impacting bearing lifespan. Currently used splash lubrication methods also fail to provide adequate lubrication for the bearings. CN201310125596.3 discloses a gearbox for a rail transit vehicle, comprising upper and lower housings, an input gear shaft, an intermediate gear shaft, an intermediate shaft large gear, an axle, and an axle large gear. The splitting mating surface of the upper and lower housings passes through the central axis of the axle and the intermediate gear shaft. The upper housing is equipped with a boom mounting seat and a safety nose. The upper housing has lubricating oil guide ribs, below which are a main oil collection groove and three independent secondary oil collection grooves. An oil level plate is provided on the main oil collection groove. Lubricating oil in the main oil collection groove overflows into the three independent secondary oil collection grooves and then provides lubrication to the supporting bearings through oil passages. The lower housing has a main oil sump below it, and a secondary oil sump is located below the axle's supporting bearings. The lower teeth of the intermediate shaft large gear are immersed in the lubricating oil in the main oil sump, and the lower teeth of the axle large gear are immersed in the secondary oil sump. In this lubrication system, the lubricating oil in the oil collection grooves flows to the bearings through oil passages and is then directly discharged. When a vehicle is stopped for an extended period and then restarted, the bearings lack lubricating oil, resulting in dry rolling and making them susceptible to burning and wear. Furthermore, without an oil reservoir within the bearings, oil flows directly into the oil sump through the return port during vehicle operation, failing to adequately lubricate the bearings. Additionally, the rapid rotation of the gears causes the oil in the gearbox to be churned out of the oil sump, preventing sufficient replenishment. Therefore, designing a lubrication channel that automatically stores oil in the bearings, ensuring adequate lubrication, extending bearing life, preventing bearing burn-out during stop-and-start cycles, and ensuring sufficient oil replenishment is crucial. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to address the shortcomings of existing gearbox lubrication systems that cannot adequately lubricate bearings, and to provide a gearbox lubrication system.

[0005] Another technical problem to be solved by the present invention is to provide a transmission gearbox including a gearbox lubrication system.

[0006] The objective of this invention is achieved through the following technical solution:

[0007] A gearbox lubrication system includes a gearbox and a lubrication system disposed inside the gearbox. The lubrication system includes an oil baffle rib disposed on the upper wall of the gearbox cavity, an oil collection pool disposed on the side wall of the gearbox cavity for collecting lubricating oil on the oil baffle rib, and an oil passage disposed in the oil collection pool for conveying lubricating oil to the bearing bore. An oil baffle plate is disposed on the inner side of the bearing bore, forming a lubrication chamber for storing a certain amount of lubricating oil between the oil baffle plate and the bearing. An oil return hole is disposed on the outer side of the bearing bore, connecting to an oil groove at the bottom of the gearbox cavity. A longitudinal oil separator is disposed in the oil groove, dividing it into an oil stirring chamber and an oil storage chamber, and the longitudinal oil separator has an opening connecting the oil stirring chamber and the oil storage chamber.

[0008] During use, the gears on the rotating shaft agitate the oil in the stirring chamber, causing the oil level to drop rapidly and fall below the oil reservoir. The oil in the oil reservoir replenishes the lubricating oil in the stirring chamber through the opening, ensuring that the stirring chamber always has sufficient oil.

[0009] When the gearbox is operating, splashed lubricating oil is collected by the oil baffles and flows into the oil collection sump. From there, it flows through oil channels into the bearing bores, thus lubricating the bearings. Simultaneously, the oil baffles in the bearing bores prevent lubricating oil from flowing out and retain some oil, improving lubrication. The lubricating oil then flows through the return oil holes into the oil sump at the bottom of the gearbox, carrying away some heat and fine impurities from the bearings, achieving oil circulation and lubrication.

[0010] Furthermore, the gearbox consists of an upper housing and a lower housing, which are connected as a whole by bolts.

[0011] Furthermore, an oil guide rib is provided between the oil baffle rib and the oil collection tank to facilitate the flow of lubricating oil on the oil baffle rib into the oil collection tank.

[0012] Furthermore, the bearing hole is provided with a bearing seat to support the bearing inside the gearbox, which avoids the bearing from being directly connected to the bearing hole on the gearbox body, reduces the deformation of the bearing hole, and facilitates replacement and maintenance.

[0013] Furthermore, the bearing housing is provided with an oil inlet at the top and an oil outlet at the bottom, so that lubricating oil can be used to lubricate the bearing and circulate the lubricating oil through the oil inlet and oil outlet on the bearing support housing.

[0014] Furthermore, the outer wall of the bearing bore of the gearbox is provided with a sealing end cap, which includes a labyrinth ring and a labyrinth cover.

[0015] Furthermore, the gearbox housing is provided with an observation window, which can be used to observe the inside of the gearbox; the cover of the observation window also serves to block and guide oil.

[0016] A transmission gearbox includes the gearbox lubrication system described above.

[0017] Furthermore, the transmission gearbox is a two-stage transmission gearbox, which is provided with an input shaft hole, an intermediate shaft hole and an axle hole. The oil collection pool of the lubrication system is provided with oil passages leading to the input shaft hole, the intermediate shaft hole and the axle hole respectively.

[0018] Furthermore, the secondary transmission gearbox has a transverse oil separator between the intermediate shaft and the axle, which divides the oil groove at the bottom of the gearbox cavity into a front oil chamber and a rear oil chamber.

[0019] Furthermore, the rear oil chamber is provided with a longitudinal oil separator plate that divides the rear oil tank into a rear oil stirring chamber and an oil storage chamber.

[0020] Furthermore, the transverse oil separator and the longitudinal oil separator are provided with openings connecting the front oil chamber, the rear oil stirring chamber and the oil storage chamber. The lubricating oil in the rear oil stirring chamber and the front oil chamber is reduced by stirring, and the oil is replenished in time by the oil storage chamber through the opening.

[0021] Compared with existing technologies, the beneficial effects are:

[0022] This invention creates a lubrication chamber by incorporating an oil baffle plate inside the bearing bore of the gearbox. This chamber serves as an oil reservoir, enabling rapid lubrication of the bearings during gearbox startup. This reduces the risk of bearing burn-out due to insufficient or no lubrication during startup and improves the long-term lubrication effect of the lubricating oil within the chamber after startup, thus reducing bearing wear. Furthermore, the lubricating oil can flow into the oil sump at the bottom of the gearbox through the return oil hole in the lubrication chamber, carrying away some of the heat and fine impurities from the bearings, achieving oil circulation and lubrication.

[0023] This invention forms a lubrication chamber by providing an oil baffle plate inside the bearing hole of the gearbox body, which avoids the bearing burning due to lack of oil when the gearbox starts and the lubricating oil flowing directly into the oil sump through the oil return hole during operation, thus ensuring that the bearing can be effectively lubricated under various conditions.

[0024] This invention separates the oil stirring chamber and the oil storage chamber by installing an oil separator in the oil trough at the bottom of the gearbox cavity. The oil separator in the oil trough prevents the lubricating oil from splitting to both sides, avoiding the problem of insufficient lubricating oil return under the rapid rotation of the gears, resulting in insufficient lubricating oil carried by the gears. When the gears rotate at high speed in the oil stirring chamber, the oil in the oil stirring chamber decreases rapidly, and the oil in the oil storage chamber replenishes the oil stirring chamber through the opening.

[0025] This invention incorporates a bearing support seat in the bearing bore, preventing damage such as deformation and cracking of the bearing bore on the gearbox body, thus reducing maintenance costs. Simultaneously, the bearing support seat is equipped with an oil inlet and an oil outlet, facilitating lubrication of the bearing and circulation of the lubricating oil. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the transmission gearbox;

[0027] Figure 2 yes Figure 1 AA section view;

[0028] Figure 3 This is a schematic diagram of the gearbox housing structure;

[0029] Figure 4 This is a schematic diagram of the lower gearbox housing structure;

[0030] Figure 5 This is a schematic diagram of the axle bearing housing structure.

[0031] The components are as follows: 1. Upper gearbox housing; 2. Lower gearbox housing; 3. Input shaft; 4. Input end labyrinth seal device; 5. Input bearing housing; 6. Input shaft end cover; 7. Intermediate shaft assembly; 8. Intermediate shaft end cover; 9. Axle labyrinth seal device; 10. Axle bearing housing; 11. Axle gear; 13. Oil drain hole; 16. Oil injection hole; 17. Observation window and cover plate; 18. Oil collection pool; 19. Oil passage; 20. Oil baffle plate; 21. Oil guide rib; 22. Oil baffle rib; 23. Oil return hole; 24. Rear oil stirring chamber; 25. Longitudinal oil separator plate; 26. Oil storage chamber; 27. Opening; 28. Oil inlet hole; 29. ​​Oil outlet hole; 30. Front oil stirring chamber; 31. Transverse oil separator plate. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0033] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, and back), these directional indications are only used to explain the relative positional relationships and movement of the components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly. If the embodiments of the present invention involve descriptions such as "first" and "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" and "second" may explicitly or implicitly include at least one of those features.

[0034] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0035] Example 1

[0036] like Figures 1-5 As shown, a gearbox lubrication system includes a gearbox and a lubrication system disposed inside the gearbox;

[0037] The gearbox is composed of an upper gearbox body 1 and a lower gearbox body 2 connected together by bolts.

[0038] The lubrication system includes an oil-blocking rib 22 located on the upper part of the inner wall of the gearbox housing 1, oil-guiding ribs 21 located on both sides of the inner wall, and an oil collection pool 18 located on the inner wall below the oil-guiding ribs 21. The lubricating oil on the oil-blocking rib 22 enters the oil collection pool 18 along the oil-guiding ribs 21. The oil collection pool 18 is provided with an oil passage 19 to transport the lubricating oil to the bearing hole.

[0039] An oil baffle 20 is provided on the inner side of the bearing hole of the lower gearbox 2. The oil baffle 20 and the bearing form a lubrication chamber that can store a certain amount of lubricating oil. An oil return hole 23 is provided at the bottom of the bearing hole, which connects to the oil groove at the bottom of the inner cavity of the lower gearbox 2, thereby forming a lubricating oil circulation system.

[0040] A longitudinal oil separator 25 is installed in the oil trough of the lower housing 2 of the gearbox, dividing the bottom space into a rear oil stirring chamber 24 and an oil storage chamber 26. The longitudinal oil separator has an opening 27 that connects the rear oil stirring chamber 24 and the oil storage chamber 26. The gear of the rotating shaft stirs the oil in the rear oil stirring chamber 24, causing the oil in the rear oil stirring chamber 24 to decrease rapidly and the oil level to be lower than the oil level in the oil storage chamber 26. The oil in the oil storage chamber 26 replenishes the lubricating oil in the rear oil stirring chamber 24 in a timely manner through the opening 27, ensuring that there is always sufficient oil in the rear oil stirring chamber 24.

[0041] Example 2

[0042] A gearbox lubrication system includes a gearbox and a lubrication system disposed inside the gearbox.

[0043] The gearbox is composed of an upper gearbox body 1 and a lower gearbox body 2 connected together by bolts.

[0044] The lubrication system includes an oil-blocking rib 22 located on the upper part of the inner wall of the gearbox housing 1, oil-guiding ribs 21 located on both sides of the inner wall, and an oil collection pool 18 located on the inner wall below the oil-guiding ribs 21. The lubricating oil on the oil-blocking rib 22 enters the oil collection pool 18 along the oil-guiding ribs 21. The oil collection pool 18 is provided with an oil passage 19 to transport the lubricating oil to the bearing hole.

[0045] An oil baffle 20 is provided on the inner side of the bearing hole of the lower gearbox 2. The oil baffle 20 and the bearing form a lubrication chamber that can store a certain amount of lubricating oil. An oil return hole 23 is provided at the bottom of the bearing hole, which connects to the oil groove at the bottom of the inner cavity of the lower gearbox 2, thereby forming a lubricating oil circulation system.

[0046] A longitudinal oil baffle 25 is installed in the oil trough of the lower housing 2 of the gearbox, dividing the bottom space into a rear oil stirring chamber 24 and an oil storage chamber 26. The longitudinal oil baffle has an opening 27 connecting the rear oil stirring chamber 24 and the oil storage chamber 26. The gear of the rotating shaft stirs the oil in the rear oil stirring chamber 24, causing the oil in the rear oil stirring chamber 24 to decrease rapidly, and the oil level is lower than the oil level in the oil storage chamber 26. The oil in the oil storage chamber 26 replenishes the lubricating oil in the rear oil stirring chamber 24 in a timely manner through the opening 27, ensuring that there is always sufficient oil in the oil stirring chamber 24.

[0047] The bearing housing is provided in the bearing hole of the combination of the upper gearbox 1 and the lower gearbox 2. The bearing housing has an oil inlet hole 28 on one side of the upper gearbox 1 and an oil outlet hole 29 on one side of the lower gearbox 2. The oil passage injects lubricating oil from the oil inlet hole 28 to lubricate the bearing, and then discharges it to the lubrication chamber from the oil outlet hole 29.

[0048] Example 3

[0049] This embodiment provides a transmission gearbox, including the gearbox lubrication system described in Embodiment 1 or Embodiment 2.

[0050] like Figures 1-5 A transmission gearbox, wherein the gearbox body is formed by bolting together an upper gearbox body 1 and a lower gearbox body 2; the gearbox body is provided with an input shaft hole, an intermediate shaft hole and an axle hole, and an input shaft 3, an intermediate shaft assembly 7 and an axle gear 11 are respectively provided in the shaft holes.

[0051] The input shaft 3 is a gear and shaft integrated design. The front end of the input shaft 3 is supported by an input shaft roller bearing and an input bearing housing 5. The input bearing housing 5 is sealed to the seat hole of the gearbox upper housing 1 by an O-ring. The front end of the input shaft 3 is sealed by an input end labyrinth seal device 4 and an O-ring. The rear end of the input shaft 3 is directly supported in the seat hole of the gearbox upper housing 1 by an input shaft roller bearing and a ball bearing. The bearing is sealed by an input shaft bearing end cover 6 and an O-ring. The input end labyrinth seal device 4 consists of an input labyrinth ring and a labyrinth cover.

[0052] The intermediate shaft assembly 7 is formed by press-fitting gears and shafts. The front and rear ends are directly supported in the bearing holes of the gearbox housing 1 by intermediate shaft tapered roller bearings, and the end faces are sealed by intermediate shaft end caps 8 and O-rings.

[0053] The axle gear 11 is directly press-fitted onto the axle. Both ends of the axle are supported in the axle hole by axle tapered roller bearings and axle bearing housings 10. The axle bearing housing 10 and the bearing hole of the gearbox upper housing 1 are sealed by O-rings. The outer end face of the axle bearing housing 10 is sealed by an axle labyrinth seal device 9 and an O-ring.

[0054] The input bearing housing 5 and the axle bearing housing 10 are provided with an oil inlet hole 28 on one side of the upper housing 1 of the gearbox and an oil outlet hole 29 on one side of the lower housing 2 of the gearbox. The oil passage injects lubricating oil from the oil inlet hole 28 and discharges it to the lubrication chamber from the oil outlet hole 29.

[0055] The gearbox upper housing 1 is provided with an observation window and cover plate 17. An oil baffle plate is provided on the inner wall of the observation window and cover plate 17. Oil guide ribs 21 are provided on both sides of the inner wall of the gearbox upper housing 1. An oil collection pool 18 is provided on the inner wall below the oil guide ribs 21. The lubricating oil on the oil baffle ribs 22 enters the oil collection pool 18 along the oil guide ribs 21. The oil collection pool 18 is provided with three oil channels 19 to deliver the lubricating oil to the input shaft hole, the intermediate shaft hole and the axle hole respectively.

[0056] An oil baffle 20 is provided on the inner edge of the bearing hole of the lower gearbox housing 2. The oil baffle 20 and the bearing form a lubrication chamber that can store a certain amount of lubricating oil. An oil return hole 23 is provided at the bottom of the bearing hole, which connects to the oil groove at the bottom of the inner cavity of the lower gearbox housing 2, thereby forming a lubricating oil circulation system. An oil filling hole 16 is provided at the high point of the lower gearbox housing 2, and an oil drain hole 13 is provided at the low point.

[0057] The lower gearbox housing 2 has a transverse oil separator 31 between the intermediate shaft assembly 7 and the axle gear 11, dividing the oil trough at the bottom of the gearbox cavity into a front oil stirring chamber 30 and a rear oil chamber. The transverse oil separator 31 has an opening 27 connecting the front oil stirring chamber 30 and the rear oil chamber. A longitudinal oil separator 25 is installed in the rear oil chamber, dividing the bottom space into a rear oil stirring chamber 24 and an oil storage chamber 26. The longitudinal oil separator 25 has an opening 27 connecting the rear oil stirring chamber 24 and the oil storage chamber 26. The gears of the rotating shaft stir the oil in the front oil stirring chamber 30 and the rear oil stirring chamber 24, causing the oil in the front oil stirring chamber 30 and the rear oil stirring chamber 24 to decrease rapidly, and the oil level is lower than the oil level in the oil storage chamber 26. The oil in the oil storage chamber 26 replenishes the lubricating oil in the front oil stirring chamber 30 and the rear oil stirring chamber 24 in a timely manner through the opening 27, ensuring that there is always sufficient oil in the front oil stirring chamber 30 and the rear oil stirring chamber 24.

[0058] When the gearbox is working, the splashed oil flows through the oil baffle and the oil baffle rib 22 of the upper gearbox body 1, respectively, along the oil guide rib 21 of the upper gearbox body 1 into the oil collection pools 18 on both sides. It then flows through the oil passages 19 within the oil collection pools 18 into the bearing holes and the bearing housing oil inlet holes 28, thus lubricating the bearings. Simultaneously, the oil baffle 20 of the bearing holes prevents oil from flowing out of the bearings, stores some oil, and flows into the oil trough at the bottom of the gearbox through the bearing housing oil outlet hole 29 and the gearbox body oil return hole 23, carrying away some heat and fine impurities from the bearings, achieving oil circulation and lubrication. When the gears rotate, the oil in the rear oil stirring chamber 24 and the front oil stirring chamber 30 is agitated and reduced, and the oil is replenished in time by the oil storage chamber 26 through the opening 27.

[0059] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A transmission gearbox, characterised in that, The gear box comprises a gear box body and a lubricating system arranged in the gear box body. The gear box body is provided with an input shaft hole, an intermediate shaft hole and an axle hole, bearing seats are arranged in bearing holes of the input shaft hole and the axle hole to mount input shaft gears and axle gears respectively, an oil inlet hole is arranged in the upper part of the bearing seat, an oil outlet hole is arranged in the lower part of the bearing seat, a sealing end cover is arranged at the outer end of the bearing seat to seal the bearing seat, and an oil return hole is arranged in the bottom of the bearing hole. The lubricating system comprises an oil retaining rib arranged on the upper wall of the inner cavity of the gear box, an oil collecting pool is arranged on the side wall of the inner cavity of the gear box, an oil channel is arranged in the oil collecting pool and connected with the oil inlet holes of the bearing holes and the bearing seats, an oil retaining plate is arranged on the inner edge of the bearing hole to form a lubricating chamber, and the oil outlet hole of the bearing seat and the oil return hole of the bearing hole are communicated to an oil groove in the bottom of the inner cavity of the gear box. The oil groove is provided with a transverse oil retaining plate and a longitudinal oil retaining plate, the transverse oil retaining plate divides the oil groove in the bottom of the inner cavity of the gear box into a front oil stirring chamber and a rear oil cavity, the longitudinal oil retaining plate divides the rear oil cavity into a rear oil stirring chamber and a storage chamber, and an opening is arranged at the position where the transverse oil retaining plate and the longitudinal oil retaining plate interfere with each other to communicate the front oil stirring chamber and the rear oil cavity and the oil stirring chamber and the storage chamber. When the gear box is working, the splashed oil flows into the oil collecting pools on both sides through the oil retaining plate and the oil retaining rib on the upper box body of the gear box, and flows into the bearing holes and the oil inlet holes of the bearing seats through the oil channels in the oil collecting pools; at the same time, the oil retaining plate of the bearing hole prevents the oil in the bearing from flowing out, stores part of the oil, and flows into the oil groove in the bottom of the gear box through the oil outlet hole of the bearing seat and the oil return hole of the box; when the gear rotates, the oil in the rear oil stirring chamber and the front oil stirring chamber is stirred to reduce, and the oil in the storage chamber is timely supplemented to the front oil stirring chamber and the rear oil stirring chamber through the opening.

2. A transmission gearbox as claimed in claim 1, characterised in that, The gear box is composed of a gear box upper box body and a gear box lower box body.

3. The transmission gearbox of claim 1, wherein, A guide oil rib is further arranged between the oil retaining rib and the oil collecting pool.

4. The transmission gearbox of claim 1, wherein, The bearing hole is provided with a bearing seat to support the bearing in the gear box, the upper part of the bearing seat is provided with an oil inlet hole, and the lower part of the bearing seat is provided with an oil outlet hole.

5. The transmission gear case of claim 1, wherein, The outer wall of the bearing hole of the gear box is provided with a sealing end cover, and the sealing end cover comprises a labyrinth ring and a labyrinth cover.

6. The transmission gearbox of claim 1, wherein, The gear box is provided with a transparent observation window on the box body.

7. The transmission gearbox of claim 1, wherein, The transmission gear box is a two-stage transmission gear box, and the oil collecting pool of the lubricating system is provided with a plurality of oil channels respectively leading to the input shaft, the intermediate shaft and the axle.

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