A lubricating system for a top-and-bottom structure speed reducer

Abstract

The utility model relates to a lubricating system of up-down structure speed reducer, including casing, the input shaft of being located casing upper part and the output shaft of being located casing lower part, both ends of input shaft, output shaft are all through bearing and casing rotatory connection, and input shaft and output shaft are driven connection through the first gear and second gear of mutual engagement, its characterized in that: the casing is equipped with the oil collecting groove respectively on the bearing outside both ends of input shaft and the bearing outside both ends of output shaft, and the casing inner wall also is equipped with the oil collecting groove on the both sides of first gear and is communicated with the oil collecting groove both ends of input shaft, and the casing inner wall also is equipped with the oil collecting groove on the both sides of second gear and is communicated with the oil collecting groove both ends of output shaft. The lubricating system of up-down structure speed reducer, no oil pump, reduce cost, do not need additional energy consumption, reduce the failure rate, more lubricating oil circulates on the casing, guarantees the full circulation of lubricating oil, can satisfy the lubricating effect under different working conditions, is favorable to slow down the temperature rise, improves the carrying capacity and service life of machine.

Description

Technical Field

[0001] This utility model relates to the field of speed reducers, and in particular to a lubrication system for a speed reducer with an upper and lower structure. Background Technology

[0002] In the field of traditional machinery, speed reducers (including transmissions) with an upper and lower structure, such as the speed reducer or transmission of a traditional loader, have difficulty reaching the upper position with lubricating oil through splashing. The bearings and gears in the upper position lack the necessary lubrication and heat dissipation. At the same time, due to the tilt of the speed reducer, the bearings in the upper position cannot be adequately lubricated after tilting. Therefore, an oil pump is often used to pump lubricating oil from the lower position to the gears and bearings at both ends of the gears in the upper position for lubrication and heat dissipation. This increases costs and energy consumption, and also increases the number of failure points. Utility Model Content

[0003] In view of this, the purpose of this utility model is to provide a lubrication system for a reducer with an upper and lower structure.

[0004] This utility model is implemented using the following scheme: a lubrication system for an upper and lower structure reducer, including a housing, an input shaft located at the upper part of the housing, and an output shaft located at the lower part of the housing. Both ends of the input shaft and the output shaft are rotatably connected to the housing via bearings. The input shaft and the output shaft are connected by a meshing first gear and a second gear. The housing is provided with oil collection grooves on the outer sides of the bearings at both ends of the input shaft and the outer sides of the bearings at both ends of the output shaft. The inner wall of the housing is also provided with oil collection grooves on both sides of the first gear and communicates with the oil collection grooves at both ends of the input shaft. The inner wall of the housing is also provided with oil collection grooves on both sides of the second gear and communicates with the oil collection grooves at both ends of the output shaft.

[0005] Furthermore, the housing consists of a front housing and a rear housing. The front end of the input shaft is rotatably connected to the front housing via a first bearing, and the rear end of the input shaft is rotatably connected to the rear housing via a second bearing. The front housing is provided with a first oil collection groove outside the first bearing, and the rear housing is provided with a second oil collection groove outside the second bearing.

[0006] Furthermore, the inner wall of the front housing is provided with a third oil collection groove and a fourth oil collection groove on the left and right sides of the first gear; the inner wall of the rear housing is provided with a fifth oil collection groove and a sixth oil collection groove on the left and right sides of the first gear.

[0007] Furthermore, the first oil collecting tank is connected to the third and fourth oil collecting tanks through the first oil passage, and the second oil collecting tank is connected to the fifth and sixth oil collecting tanks through the second oil passage.

[0008] Furthermore, the third oil collection groove on the inner wall of the front housing and the fifth oil collection groove on the inner wall of the rear housing are separated by a first partition, and the fourth oil collection groove on the inner wall of the front housing and the sixth oil collection groove on the inner wall of the rear housing are separated by a second partition.

[0009] Furthermore, the front end of the output shaft is rotatably connected to the front housing via a third bearing, and a first bearing end cover is provided on the outside of the third bearing, forming a seventh oil collection groove between the third bearing and the first bearing end cover; the rear end of the output shaft is rotatably connected to the rear housing via a fourth bearing, and a second bearing end cover is provided on the outside of the fourth bearing, forming an eighth oil collection groove between the fourth bearing and the second bearing end cover.

[0010] Furthermore, the inner wall of the front housing has a groove above the third bearing, which together with the first oil collecting plate forms a ninth oil collecting groove with the opening facing upward. The inner wall of the rear housing has a groove above the fourth bearing, which together with the second oil collecting plate forms a tenth oil collecting groove with the opening facing upward. The ninth oil collecting groove is connected to the seventh oil collecting groove through the third oil passage, and the tenth oil collecting groove is connected to the eighth oil collecting groove through the fourth oil passage.

[0011] Furthermore, the openings of the ninth and tenth oil collection grooves are close to the top of the second gear. The front housing is provided with a fifth oil passage, and the rear housing is provided with a sixth oil passage. One end of the fifth oil passage is connected to the ninth oil collection groove, and the other end is connected to one end of the sixth oil passage. The other end of the sixth oil passage is connected to the tenth oil collection groove.

[0012] Furthermore, a first oil scraper block is provided above the opening of the ninth oil collection tank, located on the front side of the top of the second gear, and a second oil scraper block is provided above the opening of the tenth oil collection tank, located on the rear side of the top of the second gear. The distance between the first oil scraper block and the front end face of the second gear is 0.2-2mm, and the distance between the second oil scraper block and the rear end face of the second gear is 0.2-2mm.

[0013] Compared with the prior art, the present invention has the following beneficial effects: The lubrication system of the upper and lower structure reducer of the present invention is reasonably designed, has no oil pump, reduces costs, does not require additional energy consumption, reduces the failure rate, and reduces the problem of insufficient lubrication due to oil pump failure; more lubricating oil circulates on the housing, ensuring sufficient lubrication circulation, which can meet the lubrication effect under different working conditions, has a good lubrication effect, and dissipates more heat through the housing, which helps to slow down the temperature rise and improve the load-bearing capacity and service life of the machine.

[0014] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below through specific embodiments and related drawings. Attached Figure Description

[0015] Figure 1 This is a cross-sectional view of the reducer according to an embodiment of the present utility model; Figure 2 yes Figure 1 Enlarged view of the upper middle section; Figure 3 yes Figure 2 Enlarged view of the lower middle section; Figure 4 This is a schematic diagram of the inner wall structure of the front housing in an embodiment of this utility model; Figure 5 This is a schematic diagram of the inner wall structure of the rear housing in an embodiment of this utility model; Figure 6 This is a schematic diagram of the structure of the first oil tank plate according to an embodiment of the present utility model; Figure 7 This is a schematic diagram of the second oil tank plate structure according to an embodiment of this utility model; Figure 8 This is a schematic diagram of the first partition structure of this utility model embodiment; Figure 9 This is a schematic diagram of the second partition structure according to an embodiment of the present invention; Explanation of the numbers in the diagram: 1-Front housing, 2-Rear housing, 3-First gear, 4-Second gear, 5-First bearing, 6-Second bearing, 7-First oil collection groove, 8-Second oil collection groove, 9-Third oil collection groove, 10-Fourth oil collection groove, 11-Fifth oil collection groove, 12-Sixth oil collection groove, 13-Third bearing, 14-Fourth bearing, 15-Seventh oil collection groove, 16-Eighth oil collection groove, 17-Ninth oil collection groove, 18-Tenth oil collection groove. 19-First oil seal, 20-Second oil seal, 21-Input shaft, 22-Output shaft, 23-First oil groove plate, 24-Second oil groove plate, 25-First oil scraper block, 26-Second oil scraper block, 27-First bearing end cover, 28-Second bearing end cover, 29-First oil passage, 30-Second oil passage, 31-Third oil passage, 32-Fourth oil passage, 33-Fifth oil passage, 34-Sixth oil passage, 35-First partition plate, 36-Second partition plate. Detailed Implementation

[0016] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0017] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0018] like Figures 1-9As shown, a lubrication system for a reducer with an upper and lower structure includes a housing, an input shaft 21 located at the upper part of the housing, and an output shaft 22 located at the lower part of the housing. Both ends of the input shaft and the output shaft are rotatably connected to the housing via bearings. The input shaft and the output shaft are connected by a meshing first gear 3 and a second gear 4. The housing has oil collection grooves on the outer sides of the bearings at both ends of the input shaft and the outer sides of the bearings at both ends of the output shaft. The inner wall of the housing also has oil collection grooves on both sides of the first gear, which communicate with the oil collection grooves at both ends of the input shaft. The lubricating oil in the oil collection grooves on both sides of the first gear flows to the oil collection grooves at both ends of the input shaft to lubricate the bearings at both ends of the input shaft. The inner wall of the housing also has oil collection grooves on both sides of the second gear, which communicate with the oil collection grooves at both ends of the output shaft. The lubricating oil in the oil collection grooves on both sides of the second gear flows to the oil collection grooves at both ends of the output shaft to lubricate the bearings at both ends of the output shaft.

[0019] In this embodiment, the housing consists of a front housing 1 and a rear housing 2. The front end of the input shaft 21 is rotatably connected to the front housing 1 via a first bearing 5, and the rear end of the input shaft 21 is rotatably connected to the rear housing 2 via a second bearing 6. The front housing 1 is provided with a first oil collection groove 7 on the outside of the first bearing, which supplies lubricating oil to the first bearing. The rear housing is provided with a second oil collection groove 8 on the outside of the second bearing, which supplies lubricating oil to the second bearing.

[0020] Both the first bearing 5 and the second bearing 6 are deep groove ball bearings, and the outer raceway of the deep groove ball bearing can store lubricating oil. The front and rear end faces of the first gear are close to the inner sidewalls of the front and rear housings, with a distance of 4~6mm. This ensures that when the first gear and the second gear mesh, due to the squeezing between the gears, more lubricating oil will be squeezed into the first oil collection groove and the second oil collection groove.

[0021] In this embodiment, the inner wall of the front housing 1 is provided with a third oil collection groove 9 and a fourth oil collection groove 10 on the left and right sides of the first gear; the inner wall of the rear housing is provided with a fifth oil collection groove 11 and a sixth oil collection groove 12 on the left and right sides of the first gear.

[0022] In this embodiment, the first oil collecting groove 7 is connected to the third and fourth oil collecting grooves via the first oil passage 29, and the second oil collecting groove 8 is connected to the fifth and sixth oil collecting grooves via the second oil passage 30. At high speeds, a significant amount of lubricating oil is splashed into the third, fourth, fifth, and sixth oil collecting grooves through the first gear, gradually filling them and ensuring adequate lubrication of the first and second bearings, while also carrying away heat from the bearings.

[0023] In this embodiment, the third oil collection groove on the inner wall of the front housing 1 and the fifth oil collection groove on the inner wall of the rear housing are separated by a first partition 35, and the fourth oil collection groove on the inner wall of the front housing and the sixth oil collection groove on the inner wall of the rear housing are separated by a second partition 36.

[0024] In this embodiment, the front end of the output shaft 22 is rotatably connected to the front housing via a third bearing 13, and a first bearing end cover 27 is provided on the outside of the third bearing, forming a seventh oil collection groove 15 between the third bearing and the first bearing end cover; the rear end of the output shaft is rotatably connected to the rear housing via a fourth bearing 14, and a second bearing end cover 28 is provided on the outside of the fourth bearing, forming an eighth oil collection groove 16 between the fourth bearing and the second bearing end cover.

[0025] In this embodiment, the inner wall of the front housing 1 has a groove above the third bearing, which together with the first oil collecting plate 23 forms an upward-opening ninth oil collecting groove 17. The inner wall of the rear housing 1 has a groove above the fourth bearing, which together with the second oil collecting plate 24 forms an upward-opening tenth oil collecting groove 18. The ninth oil collecting groove 17 is connected to the seventh oil collecting groove 15 through the third oil passage 31, and the tenth oil collecting groove 18 is connected to the eighth oil collecting groove 16 through the fourth oil passage 32. At high speeds, a significant amount of lubricating oil is splashed into the ninth and tenth oil collecting grooves through the second gear, gradually filling them and ensuring sufficient lubrication of the third and fourth bearings, while also carrying away heat from the bearings.

[0026] In this embodiment, the openings of the ninth and tenth oil collection grooves are close to the top of the second gear. The front housing 1 is provided with a fifth oil passage 33, and the rear housing is provided with a sixth oil passage 34. One end of the fifth oil passage is connected to the ninth oil collection groove, and the other end is connected to one end of the sixth oil passage. The other end of the sixth oil passage is connected to the tenth oil collection groove. That is, the ninth oil collection groove 17 in the front housing 1 and the tenth oil collection groove 18 on the rear housing 2 are connected through the fifth oil passage 33 and the sixth oil passage 34. When the reducer is tilted significantly, the ninth and tenth oil collection grooves will be at different heights. The oil collection groove at the higher position will have difficulty getting splashed lubricating oil directly into it. If the ninth oil collection groove is at the higher position, the lubricating oil from the tenth oil collection groove will flow from the sixth oil passage through the fifth oil passage to the ninth oil collection groove, and then through the third oil passage and the seventh oil collection groove into the third bearing for lubrication. If the tenth oil collection groove is at the higher position, the lubricating oil from the ninth oil collection groove will flow from the fifth oil passage through the sixth oil passage to the tenth oil collection groove, and then through the fourth oil passage and the eighth oil collection groove into the fourth bearing for lubrication. Therefore, under tilted motion, each bearing can still maintain sufficient lubrication.

[0027] Because the ninth oil collection tank 17 and the tenth oil collection tank 18 are designed to be high enough, their openings are close to the top of the second gear. Therefore, even when tilted significantly, the opening height of the lower oil collection tank is higher than the bottom height of the higher oil collection tank. When the lubricating oil level is high, the lubricating oil can still flow to the higher oil collection tank, similar to the principle of communicating vessels.

[0028] In this embodiment, a first oil scraper 25 is provided above the opening of the ninth oil collection groove, located in front of the top of the second gear, and a second oil scraper 26 is provided above the opening of the tenth oil collection groove, located in rear of the top of the second gear. The distance between the first oil scraper and the front end face of the second gear is 0.2-2mm, and the distance between the second oil scraper and the rear end face of the second gear is 0.2-2mm. This design effectively scrapes the lubricating oil adhering to the sidewall of the gear into the lower oil collection groove without interfering with each other. Furthermore, the smaller the outer diameter of the second gear, the smaller these two gaps are; the larger the outer diameter of the second gear, the larger these two gaps are. Under the action of the first oil scraper, some lubricating oil drips into the ninth oil collection groove and flows into the seventh oil collection groove through the third oil passage, further flowing into the third bearing for lubrication. Under the action of the second oil scraper, some lubricating oil drips into the tenth oil collection groove and flows into the eighth oil collection groove through the fourth oil passage, further flowing into the fourth bearing for lubrication.

[0029] The working process of the lubrication system of the upper and lower structure reducer of this utility model: (1) Initial state: When there is no power input, the reducer has lubricating oil stored in the raceway of the outer ring of the first and second bearings and in the first to eighth oil collection grooves, and the oil volume reaches the groove opening. The lubricating oil stored in the raceway of the outer ring of the first and second bearings can meet the lubrication needs of the reducer at the beginning of startup. If there is power input, the vibration of the initial rotation process after the reducer starts will cause the lubricating oil in the seventh and eighth oil collection grooves to overflow and flow into the adjacent third and fourth bearings respectively for lubrication. The gear tooth surfaces that are not soaked in lubricating oil use the lubricating oil stuck to the tooth surfaces to meet the first meshing after each startup. After the first meshing, the lower part of the second gear will continue to have lubricating oil adhering to the tooth surface of the second gear or splashing lubricating oil to keep the first gear and the second gear fully lubricated and meshed.

[0030] (2) Low speed state: During the low speed rotation of the first gear and the second gear, the lubricating oil on the bottom of the housing passes through the lubricating oil on the lower part of the second gear. The lubricating oil attached to the gear is used to lubricate the first gear and the second gear when they mesh. At the same time, due to the squeezing between the gears, some of the lubricating oil is squeezed into the first oil collection groove and the second oil collection groove through the first bearing and the second bearing respectively, and is continuously used to lubricate the first bearing and the second bearing. During the rotation of the second gear, the lubricating oil attached to both sides of the outer circumference is scraped off by the first oil scraper and the second oil scraper respectively, and flows into the ninth oil collection groove and the tenth oil collection groove respectively, and further flows into the seventh oil collection groove and the eighth oil collection groove respectively, thereby providing lubrication for the third bearing and the fourth bearing respectively. It then flows out from the other side of the third bearing and the fourth bearing and returns to the oil cavity at the bottom of the housing. This circulation process of the lubricating oil provides lubrication for the third bearing and the fourth bearing and removes heat. In the low speed state, although less lubricating oil flows into the bearing through the above means, the bearing's demand for lubricating oil is not large in the low speed state, so the bearing lubrication needs can be met.

[0031] (3) High-speed state: In the high-speed state, some lubricating oil is squeezed through the first bearing and the second bearing to the first oil collection groove and the second oil collection groove respectively. The lubricating oil entering each oil collection groove is not only squeezed between the gears, but also splashed to make more lubricating oil enter the third, fourth, fifth, sixth, ninth and tenth oil collection grooves, and can gradually fill them, so that the first, second, third and fourth bearings are fully lubricated. The first gear and the second gear are fully lubricated due to splashing and the adhesion of lubricating oil. Some of the splashed lubricating oil splashes into the third, fourth, fifth and sixth oil collection grooves respectively. The lubricating oil splashed into the third and fourth oil collection grooves flows into the first bearing through the first oil passage and the first oil collection groove, and flows back to the oil cavity at the bottom of the housing from the other end of the first bearing. The lubricating oil splashed into the fifth and sixth oil collection grooves flows into the second bearing through the second oil passage and the second oil collection groove, and flows back to the oil cavity at the bottom of the housing from the other end of the second bearing. This circulation process of lubricating oil provides lubrication for the first bearing and the second bearing and removes heat. (4) Tilting motion state: Since the third and fifth oil collection grooves are separated from the middle position of the first gear by the first partition, and the fourth and sixth oil collection grooves are separated from the middle position of the first gear by the second partition, under a certain speed, in the tilting motion state, lubricating oil will still splash into the third to sixth oil collection grooves or be squeezed into the first and second oil collection grooves from between the first and second gears through the first and second bearings respectively, satisfying the lubrication of the first and second bearings. When the tilt angle is not large, the third and fourth bearings will also be lubricated in the manner of steps (2) and (3); in the large tilting state... Under these conditions, the ninth and tenth oil collection tanks will be at different heights. The tank at the higher position will have difficulty allowing splashed lubricating oil to directly enter. If the ninth oil collection tank is at the higher position, the lubricating oil from the tenth oil collection tank will flow from the sixth oil passage through the fifth oil passage to the ninth oil collection tank, and then through the third oil passage and the seventh oil collection tank into the third bearing for lubrication. If the tenth oil collection tank is at the higher position, the lubricating oil from the ninth oil collection tank will flow from the fifth oil passage through the sixth oil passage to the tenth oil collection tank, and then through the fourth oil passage and the eighth oil collection tank into the fourth bearing for lubrication. Therefore, under tilted motion, each bearing can still maintain sufficient lubrication.

[0032] The lubrication system of this novel upper and lower structure reducer eliminates the need for an oil pump, reducing costs and eliminating the need for additional energy consumption. It also reduces the risk of insufficient lubrication due to oil pump failure. More lubricating oil circulates within the housing, ensuring thorough lubrication and dissipating more heat through the housing, thus mitigating temperature rise and improving the machine's load-bearing capacity and service life. As the rotational speed increases, the oil level in each collection tank increases, while the oil level at the bottom of the housing decreases, minimizing oil churning losses at high speeds and reducing energy loss. At low speeds, the oil level in each collection tank is lower, and the oil level at the bottom of the housing rises, allowing the second gear to carry lubricating oil from the bottom to the top, satisfying the lubrication needs of the gears and bearings at higher positions, ensuring adequate lubrication for the reducer.

[0033] Unless otherwise stated, if any of the technical solutions disclosed in this utility model discloses a numerical range, then the disclosed numerical range is a preferred numerical range. Any person skilled in the art should understand that the preferred numerical range is merely one among many feasible numerical values ​​that has a more obvious or representative technical effect. Because there are many numerical values, it is impossible to list them all. Therefore, this utility model discloses only some numerical values ​​to illustrate the technical solutions of this utility model. Furthermore, the numerical values ​​listed above should not constitute a limitation on the scope of protection of this utility model.

[0034] If this utility model discloses or relates to mutually fixedly connected parts or structural components, then unless otherwise stated, a fixed connection can be understood as: a detachable fixed connection (e.g., using bolts or screws), or a non-detachable fixed connection (e.g., riveting, welding). Of course, mutually fixed connections can also be replaced by an integral structure (e.g., manufactured by integral molding using a casting process) (except where it is obviously impossible to use an integral molding process).

[0035] In addition, unless otherwise stated, the terms used to indicate positional relationships or shapes in any of the technical solutions disclosed in this utility model above include states or shapes that are similar to, close to, or approximate with them.

[0036] Any component provided by this utility model can be assembled from multiple individual components, or it can be a single component manufactured by a one-piece molding process.

[0037] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model in any other way. Any person skilled in the art may make changes or modifications to the disclosed technical content to create equivalent embodiments. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of this utility model without departing from its technical solution shall still fall within the protection scope of this utility model.

Claims

1. A lubrication system for a reducer with an upper and lower structure, comprising a housing, an input shaft located at the upper part of the housing, and an output shaft located at the lower part of the housing, wherein both ends of the input shaft and the output shaft are rotatably connected to the housing via bearings, and the input shaft and the output shaft are connected by a meshing first gear and a second gear, characterized in that: The housing has oil collection grooves on the outer sides of the bearings at both ends of the input shaft and the outer sides of the bearings at both ends of the output shaft. The inner wall of the housing also has oil collection grooves on both sides of the first gear and communicates with the oil collection grooves at both ends of the input shaft. The inner wall of the housing also has oil collection grooves on both sides of the second gear and communicates with the oil collection grooves at both ends of the output shaft.

2. The lubrication system of the upper and lower structure reducer according to claim 1, characterized in that: The housing consists of a front housing and a rear housing. The front end of the input shaft is rotatably connected to the front housing via a first bearing, and the rear end of the input shaft is rotatably connected to the rear housing via a second bearing. The front housing has a first oil collection groove on the outside of the first bearing, and the rear housing has a second oil collection groove on the outside of the second bearing.

3. The lubrication system of the upper and lower structure reducer according to claim 2, characterized in that: The inner wall of the front housing is provided with a third oil collection groove and a fourth oil collection groove on the left and right sides of the first gear; the inner wall of the rear housing is provided with a fifth oil collection groove and a sixth oil collection groove on the left and right sides of the first gear.

4. The lubrication system of the upper and lower structure reducer according to claim 3, characterized in that: The first oil collection tank is connected to the third and fourth oil collection tanks through the first oil passage, and the second oil collection tank is connected to the fifth and sixth oil collection tanks through the second oil passage.

5. The lubrication system of the upper and lower structure reducer according to claim 3, characterized in that: The third oil collection groove on the inner wall of the front housing and the fifth oil collection groove on the inner wall of the rear housing are separated by a first partition, and the fourth oil collection groove on the inner wall of the front housing and the sixth oil collection groove on the inner wall of the rear housing are separated by a second partition.

6. The lubrication system of the upper and lower structure reducer according to claim 2, characterized in that: The front end of the output shaft is rotatably connected to the front housing via a third bearing. A first bearing end cover is provided on the outside of the third bearing, and a seventh oil collection groove is formed between the third bearing and the first bearing end cover. The rear end of the output shaft is rotatably connected to the rear housing via a fourth bearing. A second bearing end cover is provided on the outside of the fourth bearing, and an eighth oil collection groove is formed between the fourth bearing and the second bearing end cover.

7. The lubrication system of the upper and lower structure reducer according to claim 6, characterized in that: The inner wall of the front housing has a groove above the third bearing and forms a ninth oil collection groove with the first oil collection plate facing upward. The inner wall of the rear housing has a groove above the fourth bearing and forms a tenth oil collection groove with the second oil collection plate facing upward. The ninth oil collection groove is connected to the seventh oil collection groove through the third oil passage, and the tenth oil collection groove is connected to the eighth oil collection groove through the fourth oil passage.

8. The lubrication system of the upper and lower structure reducer according to claim 7, characterized in that: The openings of the ninth and tenth oil collection grooves are close to the top of the second gear. The front housing is provided with a fifth oil passage, and the rear housing is provided with a sixth oil passage. One end of the fifth oil passage is connected to the ninth oil collection groove, and the other end is connected to one end of the sixth oil passage. The other end of the sixth oil passage is connected to the tenth oil collection groove.

9. The lubrication system of the upper and lower structure reducer according to claim 7, characterized in that: Above the opening of the ninth oil collection tank, there is a first oil scraper block located on the front side of the top of the second gear, and above the opening of the tenth oil collection tank, there is a second oil scraper block located on the rear side of the top of the second gear. The distance between the first oil scraper block and the front end face of the second gear is 0.2-2mm, and the distance between the second oil scraper block and the rear end face of the second gear is 0.2-2mm.

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