Gear box and railway vehicle

Abstract

The utility model discloses a gear box and a railway vehicle, which comprises a box body, a first gear and a second gear which are meshed with each other are arranged in the box body, and a gear shaft of the first gear is respectively connected with the box body through a first bearing assembly and a second bearing assembly; the oil collecting groove is formed in the inner wall of the upper portion of the box body and used for collecting lubricating oil splashed when the second gear rotates, and a partition plate is arranged in the oil collecting groove so as to divide the inner space of the oil collecting groove into a first sub oil groove and a second sub oil groove; the box body is provided with a first inclined oil guide hole and a second inclined oil guide hole, and the first inclined oil guide hole is communicated with the first oil collection groove and used for being communicated with a first lubricating oil way of the first bearing assembly; and the second inclined oil guide hole is communicated with the second subset oil groove and is used for being communicated with a second lubricating oil way of the second bearing assembly. Lubricating oil is collected in the first oil collection groove and the second oil collection groove respectively, the inclined oil guide hole is formed, the oil guide path from the oil collection groove to the bearing is optimized, and it is guaranteed that the bearing is fully lubricated under the special working condition.

Description

Technical Field

[0001] This utility model relates to the field of gearbox hydraulic circuit structure technology, and more specifically, to a gearbox. Furthermore, this utility model also relates to a rail vehicle including the aforementioned gearbox. Background Technology

[0002] The gearbox of a rail vehicle contains gears, and the gear shafts are connected to the gearbox body via bearings. In related technologies, the bearings inside the gearbox are lubricated by splash lubrication, that is, the lubricating oil splashed up by the rotation of the large gear lubricates each bearing.

[0003] However, when lubricating bearings by splash lubrication, insufficient lubrication can easily occur during cold starts and under harsh operating conditions, which can easily lead to bearing burnout and bearing roller seizure.

[0004] Therefore, ensuring that bearings can be adequately lubricated under special conditions such as cold starts and harsh operating conditions is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0005] In view of this, the purpose of this utility model is to provide a gearbox that can ensure that the bearings are fully lubricated under special conditions such as cold start and harsh working conditions.

[0006] Another objective of this invention is to provide a rail vehicle that includes the aforementioned gearbox, which ensures that the bearings are adequately lubricated under special conditions such as cold starts and harsh operating conditions, thereby ensuring the safe and reliable operation of the rail vehicle.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A gearbox, comprising:

[0009] The housing contains a first gear and a second gear that mesh with each other. The gear shaft of the first gear is connected to the housing via a first bearing assembly and a second bearing assembly, respectively.

[0010] An oil collection trough is provided on the inner wall of the upper part of the housing to collect the lubricating oil splashed up when the second gear rotates. The oil collection trough is provided with a partition plate to divide the internal space of the oil collection trough into a first sub-oil collection trough and a second sub-oil collection trough.

[0011] The housing is provided with a first inclined oil guide hole and a second inclined oil guide hole. The first inclined oil guide hole is connected to the first sub-oil collection groove and is used to connect to the first lubricating oil passage of the first bearing assembly. The second inclined oil guide hole is connected to the second sub-oil collection groove and is used to connect to the second lubricating oil passage of the second bearing assembly.

[0012] Optionally, the first bearing assembly includes a bearing housing and a first bearing disposed between the bearing housing and the gear shaft. The bearing housing is provided with a first oil guide hole, one end of which communicates with the first inclined oil guide hole, and the other end of which communicates with the interior of the first bearing.

[0013] Optionally, the bearing housing is provided with a first confluence groove at the position where the first inclined oil guide hole and the first oil guide hole are connected.

[0014] Optionally, the number of the first bearings is two, namely a second bearing and a third bearing. An outer spacer is provided between the second bearing and the third bearing. The outer spacer is provided with a second oil guide hole, which is used to connect the first oil guide hole and the interior of the first bearing.

[0015] Optionally, the outer spacer sleeve is provided with a first oil return hole, and the bearing housing is provided with a second oil return hole. The first oil return hole is connected between the interior of the first bearing and the second oil return hole, and the second oil return hole is used to allow the lubricating oil inside the first bearing to flow back.

[0016] Optionally, the bearing housing is provided with a second manifold at the position where the first oil return hole and the second oil return hole communicate.

[0017] Optionally, the second bearing assembly includes a fourth bearing and an oil baffle ring. The oil baffle ring is provided with an oil guide groove. One end of the oil guide groove is connected to the second inclined oil guide hole, and the other end is connected to the interior of the fourth bearing.

[0018] Optionally, the oil baffle ring is provided with an oil return groove, which is used to allow the lubricating oil inside the fourth bearing to flow back.

[0019] Optionally, the bottom of the housing is provided with an oil sump, and the lower inner wall of the housing is provided with a first inclined oil return hole and a second inclined oil return hole. One end of the first inclined oil return hole is connected to the oil return port of the first lubricating oil circuit, and the other end is connected to the oil sump; one end of the second inclined oil return hole is connected to the oil return port of the second lubricating oil circuit, and the other end is connected to the oil sump.

[0020] A rail vehicle comprising any of the aforementioned gearboxes.

[0021] The gearbox provided by this utility model has the following beneficial effects:

[0022] During operation, the first and second gears mesh and drive each other. When the second gear rotates, it throws up the lubricating oil at the bottom of the gearbox, causing the splashed lubricating oil to enter the oil collection groove. The oil collection groove collects the splashed lubricating oil. Because the oil collection groove is equipped with a partition plate, the internal space of the oil collection groove is divided into a first sub-oil collection groove and a second sub-oil collection groove. This helps to ensure that the lubricating oil is collected in the first sub-oil collection groove and the second sub-oil collection groove respectively. The lubricating oil in the first sub-oil collection groove enters the first lubricating oil passage of the first bearing assembly through the first inclined oil guide hole, so that the lubricating oil in the first sub-oil collection groove enters the bearing of the first bearing assembly through the first lubricating oil passage, and plays a role in lubricating the bearing of the first bearing assembly. The lubricating oil in the second sub-oil collection groove enters the second lubricating oil passage of the second bearing assembly through the second inclined oil guide hole, so that the lubricating oil in the second sub-oil collection groove enters the bearing of the second bearing assembly through the second lubricating oil passage, and plays a role in lubricating the bearing of the second bearing assembly.

[0023] In other words, the gearbox uses a partition plate to divide the internal space of the oil collection tank into a first sub-oil collection tank and a second sub-oil collection tank, ensuring that lubricating oil is collected in the first and second sub-oil collection tanks respectively. This ensures that there is sufficient lubricating oil in the first and second sub-oil collection tanks to flow to the first and second bearing assemblies respectively. At the same time, by setting inclined oil guide holes (i.e., the first inclined oil guide hole and the second inclined oil guide hole), the oil guide path from the oil collection tank to the first and second bearing assemblies is optimized. Compared with multiple corner paths, the oil guide path can be reduced, which is more conducive to the lubricating oil in the first and second sub-oil collection tanks flowing into the first and second bearing assemblies respectively. This allows for better lubrication of the bearings in the first and second bearing assemblies, ensuring that the bearings are adequately lubricated even under special conditions such as cold starts and harsh operating conditions, improving the lubrication effect, and preventing failures such as bearing burnout and bearing roller seizure.

[0024] The rail vehicle provided by this utility model includes the aforementioned gearbox and at least has the beneficial effects of the aforementioned gearbox. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0026] Figure 1 This is a cross-sectional view of a gearbox provided in a specific embodiment of the present utility model.

[0027] Figure label:

[0028] 1-Box body; 11-Divider plate; 111-First sub-oil collection groove; 112-Second sub-oil collection groove; 12-First inclined oil guide hole; 13-Second inclined oil guide hole; 14-Oil pool; 15-First inclined oil return hole; 16-Second inclined oil return hole; 2-Bearing seat; 21-First oil guide hole; 22-First confluence groove; 23-Second oil return hole; 24-Second confluence groove; 3-Second bearing; 4-Third bearing; 5-Outer spacer; 51-Second oil guide hole; 52-First oil return hole; 6-Fourth bearing; 7-Oil retainer ring; 71-Oil guide groove; 72-Oil return groove; 8-Inner spacer. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0030] The core of this invention is to provide a gearbox that ensures adequate lubrication of bearings under special conditions such as cold starts and harsh operating conditions. Another core aspect of this invention is to provide a rail vehicle including the aforementioned gearbox, which ensures adequate lubrication of bearings under special conditions such as cold starts and harsh operating conditions, thereby ensuring the safe and reliable operation of the rail vehicle.

[0031] Please refer to Figure 1 This is a cross-sectional view of the gearbox provided in a specific embodiment of the present utility model. Figure 1 The arrows in the diagram indicate the direction of lubricant flow.

[0032] This utility model embodiment provides a gearbox, including a housing 1 and an oil collection groove. The housing 1 is provided with a first gear and a second gear that mesh with each other. The gear shaft of the first gear is connected to the housing 1 through a first bearing assembly and a second bearing assembly, respectively. The oil collection groove is provided on the inner wall of the upper part of the housing 1 for collecting lubricating oil splashed up when the second gear rotates. The oil collection groove is provided with a partition plate 11 to divide the internal space of the oil collection groove into a first sub-oil collection groove 111 and a second sub-oil collection groove 112. The housing 1 is provided with a first inclined oil guide hole 12 and a second inclined oil guide hole 13. The first inclined oil guide hole 12 communicates with the first sub-oil collection groove 111 and is used to communicate with the first lubricating oil passage of the first bearing assembly. The second inclined oil guide hole 13 communicates with the second sub-oil collection groove 112 and is used to communicate with the second lubricating oil passage of the second bearing assembly.

[0033] Understandably, during operation, the first gear and the second gear mesh and transmit power. The first gear can be the driving gear, and the second gear can be the driven gear. The diameter of the first gear can be smaller than the diameter of the second gear. When the second gear rotates, it throws up the lubricating oil at the bottom of the gearbox, causing the thrown lubricating oil to splash into the oil collection tank. The oil collection tank collects the splashed lubricating oil. Since the oil collection tank is equipped with a partition plate 11, the partition plate 11 divides the internal space of the oil collection tank into a first sub-oil collection tank 111 and a second sub-oil collection tank 112. This helps to ensure that the lubricating oil is distributed between the first sub-oil collection tank 111 and the second sub-oil collection tank 112. The lubricating oil in the first sub-collecting oil groove 111 enters the first lubricating oil passage of the first bearing assembly through the first inclined oil guide hole 12, so that the lubricating oil in the first sub-collecting oil groove 111 enters the bearing interior of the first bearing assembly through the first lubricating oil passage, thereby lubricating the bearing of the first bearing assembly; the lubricating oil in the second sub-collecting oil groove 112 enters the second lubricating oil passage of the second bearing assembly through the second inclined oil guide hole 13, so that the lubricating oil in the second sub-collecting oil groove 112 enters the bearing interior of the second bearing assembly through the second lubricating oil passage, thereby lubricating the bearing of the second bearing assembly.

[0034] In other words, this embodiment uses a partition plate 11 to divide the internal space of the oil collection tank into a first sub-oil collection tank 111 and a second sub-oil collection tank 112, ensuring that lubricating oil is collected in the first sub-oil collection tank 111 and the second sub-oil collection tank 112 respectively. This ensures that there is sufficient lubricating oil in the first sub-oil collection tank 111 and the second sub-oil collection tank 112 respectively, so that it can flow to the first bearing assembly and the second bearing assembly respectively. At the same time, by setting inclined oil guide holes (i.e., the first inclined oil guide hole 12 and the second inclined oil guide hole 13), the oil guide path from the oil collection tank to the first bearing assembly and the second bearing assembly is optimized. Compared with multiple corner paths, the oil guide path can be relatively reduced, which is more conducive to the lubricating oil in the first sub-oil collection tank 111 and the second sub-oil collection tank 112 flowing into the first bearing assembly and the second bearing assembly respectively. This can better lubricate the bearings of the first bearing assembly and the second bearing assembly, ensuring that the bearings can be fully lubricated even under special working conditions such as cold start and harsh working conditions, improving the lubrication effect, and preventing failures such as bearing burnout and bearing roller seizure.

[0035] Understandably, the oil collection groove is located on the inner wall of the upper part of the housing 1. For example, the oil collection groove can be located on the inner side of the top wall of the housing 1. This is beneficial for the oil collection groove to be located above the first bearing assembly and the second bearing assembly, thereby facilitating the smooth flow of lubricating oil from top to bottom by utilizing gravity, etc. In addition, the oil collection groove is located close to the second gear so that more lubricating oil thrown up when the second gear rotates can enter the oil collection groove. In conjunction with the inclined oil guide holes (first inclined oil guide hole 12 and second inclined oil guide hole 13), the lubricating oil can smoothly enter the first bearing assembly and the second bearing assembly.

[0036] The end of the first inclined oil guide hole 12 connected to the first sub-oil collecting groove 111 can be located at one end of the oil collecting groove, that is, the end of the first sub-oil collecting groove 111 away from the partition plate 11; the end of the second inclined oil guide hole 13 connected to the second sub-oil collecting groove 112 can be located at the other end of the oil collecting groove, that is, the end of the second sub-oil collecting groove 112 away from the partition plate 11. This is beneficial to minimize the path of the first inclined oil guide hole 12 and the second inclined oil guide hole 13 and to increase the inclination angle of the first inclined oil guide hole 12 and the second inclined oil guide hole 13.

[0037] Additionally, it should be noted that the first lubrication passage of the first bearing assembly refers to the various oil passages (such as oil guide holes or oil guide grooves 71) opened in the first bearing assembly, used to allow lubricating oil to flow into the bearing of the first bearing assembly, or to allow the lubricating oil inside the bearing of the first bearing assembly to flow back; the second lubrication passage of the second bearing assembly refers to the various oil passages (such as oil guide holes or oil guide grooves 71) opened in the second bearing assembly, used to allow lubricating oil to flow into the bearing of the second bearing assembly, or to allow the lubricating oil inside the bearing of the second bearing assembly to flow back.

[0038] In some embodiments, the first bearing assembly includes a bearing housing 2 and a first bearing disposed between the bearing housing 2 and the gear shaft. The bearing housing 2 is provided with a first oil guide hole 21. One end of the first oil guide hole 21 is connected to a first inclined oil guide hole 12, and the other end is connected to the interior of the first bearing.

[0039] In other words, in this embodiment, the first lubrication path of the first bearing assembly includes a first oil guide hole 21 provided in the bearing housing 2. The first oil guide hole 21 is used to connect the first inclined oil guide hole 12 and the interior of the first bearing so that the lubricating oil in the first sub-collecting oil groove 111 can eventually flow into the interior of the first bearing.

[0040] It should be noted that the number of first bearings can be one or at least two. When the number of first bearings is at least two, the structures of the different first bearings can be the same or different.

[0041] For example, in some embodiments, there are two first bearings, namely a second bearing 3 and a third bearing 4. An outer spacer 5 is provided between the second bearing 3 and the third bearing 4. The outer spacer 5 has a second oil guide hole 51, which is used to connect the first oil guide hole 21 and the interior of the first bearing. In addition, an inner spacer 8 is also provided between the second bearing 3 and the third bearing 4.

[0042] In other words, in this embodiment, the first bearing assembly includes two first bearings, namely the second bearing 3 and the third bearing 4. Moreover, the second bearing 3 and the third bearing 4 are separated by the outer spacer 5. At this time, the first lubrication oil passage of the first bearing assembly also includes a second oil guide hole 51 provided in the outer spacer 5. That is, in this embodiment, by providing oil guide holes on the bearing seat 2 and the outer spacer 5 respectively, the lubricating oil in the first inclined oil guide hole 12 is introduced into the interior of the second bearing 3 and the third bearing 4. Since the outer spacer 5 is located between the second bearing 3 and the third bearing 4, by opening an oil guide hole on the outer spacer 5, it is more conducive to the lubricating oil entering the interior of the second bearing 3 and the third bearing 4 more evenly, ensuring that the second bearing 3 and the third bearing 4 can receive sufficient lubrication.

[0043] In addition, in order to ensure smooth connection between the first oil guide hole 21 and the second oil guide hole 51 and to minimize the lubricating oil path, in some embodiments, the first oil guide hole 21 and the second oil guide hole 51 are both vertically arranged and collinearly arranged, that is, the first oil guide hole 21 and the second oil guide hole 51 are vertically aligned. This facilitates the lubricating oil flowing out of the first oil guide hole 21 to directly enter the second oil guide hole 51.

[0044] In addition, in order to facilitate the smooth connection between the first oil guide hole 21 and the first inclined oil guide hole 12, in some embodiments, the bearing seat 2 is provided with a first confluence groove 22 at the position where the first inclined oil guide hole 12 and the first oil guide hole 21 are connected.

[0045] In other words, the lubricating oil flowing out of the first inclined oil guide hole 12 first enters the first manifold 22, and then flows from the first manifold 22 into the first oil guide hole 21. The first manifold 22 serves to connect the first inclined oil guide hole 12 and the first oil guide hole 21, which helps to smoothly connect the first inclined oil guide hole 12 and the first oil guide hole 21. Moreover, the first manifold 22 also has the function of converging, which helps to make the lubricating oil in the first manifold 22 enter the first oil guide hole 21 more evenly and stably.

[0046] It should be noted that the specific number of the first oil guide hole 21 and the second oil guide hole 51 is not limited in this embodiment of the utility model. The number of the first oil guide hole 21 and the second oil guide hole 51 can be one or at least two. The first oil guide hole 21 can be distributed along the circumference of the bearing seat 2, and the second oil guide hole 51 can be distributed along the circumference of the outer spacer 5, so that the lubricating oil flowing out from the first inclined oil guide hole 12 can enter the interior of the second bearing 3 and the third bearing 4 from multiple positions.

[0047] In addition, in order to facilitate the return of lubricating oil inside the second bearing 3 and the third bearing 4, in some embodiments, the outer sleeve 5 is provided with a first oil return hole 52 and the bearing seat 2 is provided with a second oil return hole 23. The first oil return hole 52 is connected between the inside of the first bearing and the second oil return hole 23, and the second oil return hole 23 is used to allow the lubricating oil inside the first bearing to return.

[0048] In other words, the lubricating oil inside the two first bearings (second bearing 3 and third bearing 4) flows out through the first oil return hole 52 and the second oil return hole 23, realizing the return flow of the lubricating oil inside the second bearing 3 and the third bearing 4. It can be understood that in this embodiment, by providing the first oil return hole 52 on the outer spacer 5, the lubricating oil inside the second bearing 3 and the third bearing 4 can flow out through the first oil return hole 52. Since the outer spacer 5 is located between the second bearing 3 and the third bearing 4, it is more conducive to the flow out of the lubricating oil inside the second bearing 3 and the third bearing 4 by opening the first oil return hole 52 on the outer spacer 5.

[0049] In order to ensure smooth connection between the first oil return hole 52 and the second oil return hole 23 and to minimize the lubricating oil path, in some embodiments, the first oil return hole 52 and the second oil return hole 23 are both vertically arranged and collinearly arranged, that is, the first oil return hole 52 and the second oil return hole 23 are vertically aligned. This facilitates the lubricating oil flowing out of the first oil return hole 52 to directly enter the second oil return hole 23.

[0050] In addition, in some embodiments, the bearing housing 2 is provided with a second manifold 24 at the position where the first oil return hole 52 and the second oil return hole 23 are connected.

[0051] In other words, in this embodiment, a second confluence groove 24 is provided between the first oil return hole 52 and the second oil return hole 23. The second confluence groove 24 serves as a connection between the first oil return hole 52 and the second oil return hole 23, which helps to make the lubricating oil flowing out of the first oil return hole 52 enter the second oil return hole 23 more evenly and stably.

[0052] It should be noted that this embodiment does not limit the number of the first oil return hole 52 and the second oil return hole 23. The first oil return hole 52 and the second oil return hole 23 can each be one or at least two. When the bearing seat 2 is provided with a second confluence groove 24 at the position where the first oil return hole 52 and the second oil return hole 23 are connected, the number of the first oil return hole 52 can be multiple and the number of the second oil return hole 23 can be one. The lubricating oil in the multiple first oil return holes 52 flows into the second confluence groove 24 and then flows out through the second confluence groove 24 into the second oil return hole 23.

[0053] In addition, in some embodiments, the second bearing assembly includes a fourth bearing 6 and an oil baffle ring 7. The oil baffle ring 7 is provided with an oil guide groove 71. One end of the oil guide groove 71 is connected to the second inclined oil guide hole 13, and the other end is connected to the interior of the fourth bearing 6.

[0054] In other words, in this embodiment, the second lubrication oil passage of the second bearing assembly includes an oil guide groove 71 provided on the oil baffle ring 7. The oil guide groove 71 is used to connect the second inclined oil guide hole 13 and the interior of the fourth bearing 6 so that the lubricating oil in the second sub-collecting oil groove 112 can eventually flow into the interior of the fourth bearing 6.

[0055] In addition, in order to facilitate the return of lubricating oil inside the fourth bearing 6, in some embodiments, the oil baffle ring 7 is provided with an oil return groove 72, which is used to allow the lubricating oil inside the fourth bearing 6 to return.

[0056] In other words, the lubricating oil inside the fourth bearing 6 flows out through the oil return groove 72, realizing the return of the lubricating oil inside the fourth bearing 6.

[0057] Understandably, in order to follow the flow trend of lubricating oil, the oil guide groove 71 is located at the top of the oil baffle ring 7, and the oil return groove 72 is located at the bottom of the oil baffle ring 7.

[0058] Furthermore, in some embodiments, the bottom of the housing 1 is provided with an oil sump 14, and the inner wall of the lower part of the housing 1 is provided with a first inclined oil return hole 15 and a second inclined oil return hole 16. One end of the first inclined oil return hole 15 is connected to the oil return port of the first lubricating oil circuit, and the other end is connected to the oil sump 14; one end of the second inclined oil return hole 16 is connected to the oil return port of the second lubricating oil circuit, and the other end is connected to the oil sump 14.

[0059] In other words, this embodiment uses an oil sump 14 at the bottom of the housing 1 to collect the lubricating oil, which facilitates the distribution of the lubricating oil. Furthermore, this embodiment utilizes a first inclined oil return hole 15 to introduce the lubricating oil from the first bearing assembly into the oil sump 14. For example, the first inclined oil return hole 15 is connected to a second oil return hole 23 to introduce the lubricating oil flowing from the second bearing 3 and the third bearing 4 into the first oil return hole 52 and the second oil return hole 23 into the oil sump 14, thus achieving oil return for the second bearing 3 and the third bearing 4. Simultaneously, this embodiment utilizes a second inclined oil return hole 16 to introduce the lubricating oil from the second bearing assembly into the oil sump 14. For example, the second inclined oil return hole 16 is connected to an oil return groove 72 to introduce the lubricating oil flowing from the fourth bearing 6 into the oil sump 14, thus achieving oil return for the fourth bearing 6.

[0060] In addition to the gearbox described above, this utility model also provides a rail vehicle that includes the gearbox disclosed in the above embodiments. For the structure of other parts of the rail vehicle, please refer to the relevant technology, which will not be repeated here.

[0061] The key point of this embodiment is that the gearbox disclosed in any of the above embodiments has at least the beneficial effects of the gearbox, which will not be repeated here.

[0062] It should also be noted that, in this specification, relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0063] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0064] The gearbox and rail vehicle provided by this utility model have been described in detail above. Specific examples have been used to illustrate the principle and implementation of this utility model. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core idea of ​​this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principle of this utility model, and these improvements and modifications also fall within the protection scope of this utility model.

Claims

1. A gearbox, characterized in that, include: The housing (1) is provided with a first gear and a second gear that mesh with each other. The gear shaft of the first gear is connected to the housing (1) through a first bearing assembly and a second bearing assembly, respectively. An oil collection trough is provided on the inner wall of the upper part of the housing (1) to collect the lubricating oil splashed up when the second gear rotates. The oil collection trough is provided with a partition plate (11) to divide the internal space of the oil collection trough into a first sub-oil collection trough (111) and a second sub-oil collection trough (112). The housing (1) is provided with a first inclined oil guide hole (12) and a second inclined oil guide hole (13). The first inclined oil guide hole (12) is connected to the first sub-oil collection groove (111) and is used to connect to the first lubricating oil passage of the first bearing assembly. The second inclined oil guide hole (13) is connected to the second sub-oil collection groove (112) and is used to connect to the second lubricating oil passage of the second bearing assembly.

2. The gearbox according to claim 1, characterized in that, The first bearing assembly includes a bearing housing (2) and a first bearing disposed between the bearing housing (2) and the gear shaft. The bearing housing (2) is provided with a first oil guide hole (21). One end of the first oil guide hole (21) is connected to the first inclined oil guide hole (12), and the other end is connected to the interior of the first bearing.

3. The gearbox according to claim 2, characterized in that, The bearing housing (2) is provided with a first confluence groove (22) at the position where the first inclined oil guide hole (12) and the first oil guide hole (21) are connected.

4. The gearbox according to claim 2, characterized in that, The first bearing consists of two bearings, namely the second bearing (3) and the third bearing (4). An outer spacer (5) is provided between the second bearing (3) and the third bearing (4). The outer spacer (5) is provided with a second oil guide hole (51). The second oil guide hole (51) is used to connect the first oil guide hole (21) and the interior of the first bearing.

5. The gearbox according to claim 4, characterized in that, The outer sleeve (5) is provided with a first oil return hole (52), and the bearing seat (2) is provided with a second oil return hole (23). The first oil return hole (52) is connected between the interior of the first bearing and the second oil return hole (23). The second oil return hole (23) is used to allow the lubricating oil inside the first bearing to flow back.

6. The gearbox according to claim 5, characterized in that, The bearing housing (2) is provided with a second manifold (24) at the position where the first oil return hole (52) and the second oil return hole (23) are connected.

7. The gearbox according to any one of claims 1-6, characterized in that, The second bearing assembly includes a fourth bearing (6) and an oil baffle ring (7). The oil baffle ring (7) is provided with an oil guide groove (71). One end of the oil guide groove (71) is connected to the second inclined oil guide hole (13), and the other end is connected to the interior of the fourth bearing (6).

8. The gearbox according to claim 7, characterized in that, The oil baffle ring (7) is provided with an oil return groove (72), which is used to allow the lubricating oil inside the fourth bearing (6) to flow back.

9. The gearbox according to any one of claims 1-6, characterized in that, The bottom of the box (1) is provided with an oil sump (14). The inner wall of the lower part of the box (1) is provided with a first inclined oil return hole (15) and a second inclined oil return hole (16). One end of the first inclined oil return hole (15) is connected to the oil return port of the first lubricating oil circuit, and the other end is connected to the oil sump (14). One end of the second inclined oil return hole (16) is connected to the oil return port of the second lubricating oil circuit, and the other end is connected to the oil sump (14).

10. A rail vehicle, characterized in that, Includes the gearbox as described in any one of claims 1-9.

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