Follow-up gear box

Abstract

The utility model relates to a follow -up gear box relates to transmission device technical field, it includes box, bearing seat, first bearing, second bearing, input shaft, oil seal and the transparent cover. Bearing seat is provided with assembly through -hole and oil hole, one end of oil hole is through the hole wall of assembly through -hole, the other end is located on the outer surface of bearing seat, and oil hole is used for guiding lubricating oil to assembly through -hole, bearing seat is installed on the box, and first bearing and second bearing are all installed in assembly through -hole and are arranged in the axial direction of assembly through -hole interval, transparent cover is installed on bearing seat, and transparent cover is located on the outside of bearing seat, input shaft passes first bearing, second bearing and transparent cover in proper order, and oil seal is arranged between bearing seat and input shaft, it can improve the lubrication effect of bearing at the position where input shaft is located, prolong the service life of whole machine, improve the reliability of whole machine work.

Description

Technical Field

[0001] This utility model relates to the field of transmission device technology, and more specifically, to a follower gearbox. Background Technology

[0002] In the field of mining equipment and engineering machinery, especially in the cutting mechanism of longitudinal shaft tunneling machines, the cutting head, as a moving mechanical component, needs to frequently perform upward (maximum elevation angle) and downward (maximum depression angle) movements during tunneling operations, with its working posture changing in real time. Currently, the gearbox used to drive the cutting head in this type of equipment usually adopts splash lubrication, that is, relying on the lubricating oil stored inside the gearbox to splash to various lubrication points when the gears rotate.

[0003] However, the existing bearing lubrication structure of such gearboxes has significant defects. Specifically, the input shaft is usually supported only by bearings within a bearing housing, which is a closed structure. Lubricating oil can only enter the bearing mounting holes by splashing. When the cutting section is in a high-angle working state, the oil level inside the gearbox tilts sharply and moves away from the input shaft bearing, resulting in a sharp reduction in the amount of oil splashed to that bearing. Due to insufficient lubrication, the bearing experiences dry friction, which in turn leads to premature overheating failure, severely limiting the service life of the gearbox and the reliability of the entire machine. Utility Model Content

[0004] The purpose of this utility model includes, for example, providing a follow-up gearbox that can improve the lubrication effect of the bearing at the input shaft location, extend the service life of the whole machine, and improve the reliability of the whole machine operation.

[0005] The embodiments of this utility model can be implemented as follows: In a first aspect, this utility model provides a follower-type gearbox, comprising: Housing, bearing housing, first bearing, second bearing, input shaft, oil seal, and through cover; The bearing housing is provided with an assembly through hole and an oil passage hole. One end of the oil passage hole penetrates the wall of the assembly through hole, and the other end is located on the outer surface of the bearing housing. The oil passage hole is used to guide lubricating oil into the assembly through hole. The bearing housing is mounted on the housing. The first bearing and the second bearing are both mounted in the assembly through hole and are spaced apart in the axial direction of the assembly through hole. The through cover is mounted on the bearing housing and is located on the outside of the bearing housing. The input shaft passes through the first bearing, the second bearing, and the through cover in sequence. The oil seal is disposed between the bearing housing and the input shaft.

[0006] In an optional embodiment, there are two oil passage holes. One of the oil passage holes penetrates the wall of the assembly through hole and is located between the first bearing and the second bearing. The other oil passage hole penetrates the wall of the assembly through hole and is located between the second bearing and the through cover.

[0007] In an optional embodiment, an oil storage groove is further provided on the outer surface of the bearing housing, and the end of the oil passage hole away from the assembly through hole is connected to the oil storage groove.

[0008] In an optional embodiment, the bearing housing includes an integral plate and a boss, the boss being located on one surface of the plate, and the mounting through hole penetrating both the plate and the boss. The oil storage groove is disposed on the outer peripheral surface of the boss, and the end of the oil passage hole away from the assembly through hole penetrates the bottom wall of the oil storage groove.

[0009] In an optional embodiment, the bearing housing further includes an oil baffle. The oil storage groove on the side away from the plate body in the axial direction of the assembly through hole is set as an open side, and the oil baffle is fixedly connected to the boss and covers the open side.

[0010] In an optional embodiment, the bearing housing is further provided with an oil return hole, one end of which penetrates the wall of the assembly through hole, and the other end of which is located on the outer surface of the bearing housing, and the oil return hole is located below the oil through hole.

[0011] In an optional embodiment, the height of the position where the oil return hole penetrates the wall of the assembly through hole is higher than the lowest position of the wall of the assembly through hole.

[0012] In an optional embodiment, the follower gearbox further includes a spacer ring, which is sleeved on the input shaft and located between the first bearing and the second bearing; the spacer ring is provided with a radial through hole and an axial through hole, one end of the radial through hole is connected to the oil passage hole, and the other end of the radial through hole is connected to the axial through hole; the two ends of the axial through hole are respectively used to deliver lubricating oil to the first bearing and the second bearing.

[0013] In an optional embodiment, an annular groove is provided on the outer circumferential surface of the spacer ring; there are multiple radial through holes and multiple axial through holes, the multiple radial through holes are arranged at intervals in the circumferential direction of the spacer ring, the multiple axial through holes are arranged at intervals in the circumferential direction of the spacer ring, one end of each radial through hole is connected to the annular groove, and the other end is connected to the corresponding axial through hole.

[0014] In an optional embodiment, the first bearing and / or the second bearing may be configured as an angular contact ball bearing.

[0015] The beneficial effects of this utility model embodiment include, for example: The follower gearbox provided in this embodiment has an oil passage hole on the bearing housing, with one end of the oil passage hole penetrating through the wall of the mounting through hole and the other end exposed on the outer surface of the bearing housing. When the gearbox is in a pitched working state, even if the liquid level of the splashed oil inside the gearbox deviates, the lubricating oil accumulated outside can still be actively guided and continuously injected into the mounting through hole through the oil passage hole, directly wetting the rolling elements and raceways of the first and second bearings. This ensures that the bearing oil supply path is not interrupted under large pitch conditions, effectively eliminating the risk of oil shortage failure caused by attitude changes. At the same time, since the input shaft passes through the first and second bearings in sequence, and the two bearings are arranged axially in the mounting through hole at intervals to form a span-type double support structure, the double bearing spacing layout significantly increases the radial support span of the input shaft, greatly improving the overall rigidity of the shaft system. Under strong vibration and impact environment, the radial offset of the shaft end is effectively suppressed by the double bearing spacing constraint, the input shaft axis remains centered and stable, the load distribution inside the bearing is uniform, and the contact stress concentration caused by vibration and off-center loading is avoided. Based on this, the cover is installed on the outside of the bearing housing and passes through the input shaft. The oil seal is set between the bearing housing and the input shaft, which not only seals the outer port of the assembly through hole to prevent the lubricating oil guided into the hole from leaking out, but also ensures that the internal lubrication environment is closed and stable. Thus, under pitch displacement and strong vibration conditions, it can work together to ensure sufficient lubrication and precise alignment of the bearing, significantly improving the operational reliability and service life of the high-speed shaft system under extreme oscillation conditions. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram illustrating the attitude change of the follower gearbox provided in this embodiment; Figure 2 This is a partial structural schematic diagram of the follower gearbox provided in this embodiment; Figure 3 for Figure 2 Schematic diagram of the cross-sectional structure along the AA direction; Figure 4 for Figure 2 Schematic diagram of the cross-sectional structure along the BB direction; Figure 5This is a schematic diagram of the fixed-distance ring provided in this embodiment.

[0018] icon: 100-Box body; 200-Bearing seat; 201-Assembly through hole; 202-First oil passage hole; 203-Second oil passage hole; 204-Oil return hole; 205-First oil reservoir groove; 206-Second oil reservoir groove; 210-Plate body; 220-First boss; 230-Second boss; 240-First oil baffle plate; 250-Second oil baffle plate; 300-First bearing; 400-Second bearing; 500-Input shaft; 510-Shoulder; 600-Oil seal; 700-Through cover; 800-Spacer ring; 810-Radial through hole; 820-Axial through hole; 830-Annular groove; 900-Locking nut; 910-Shaft sleeve; 920-Sealing ring; 930-Oil seal pressure plate; 940-Fixing bolt; 950-Output shaft; 960-Gear transmission assembly. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0021] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0022] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0023] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0024] It should be noted that, where there is no conflict, the features in the embodiments of this utility model can be combined with each other.

[0025] Please refer to Figures 1-4 This embodiment provides a follower-type gearbox, which includes a housing 100, a bearing housing 200, a first bearing 300, a second bearing 400, an input shaft 500, an oil seal 600, and a through cover 700. The bearing housing 200 is provided with a mounting through hole 201 and an oil passage hole. One end of the oil passage hole penetrates the wall of the mounting through hole 201, and the other end is located on the outer surface of the bearing housing 200. The oil passage hole is used to guide lubricating oil into the mounting through hole 201. The bearing housing 200 is mounted on the housing 100. The first bearing 300 and the second bearing 400 are both mounted in the mounting through hole 201 and are spaced apart axially in the mounting through hole 201. The through cover 700 is mounted on the bearing housing 200 and is located on the outside of the bearing housing 200. The input shaft 500 passes sequentially through the first bearing 300, the second bearing 400, and the through cover 700. The oil seal 600 is disposed between the bearing housing 200 and the input shaft 500.

[0026] As described above, the working principle of the follower gearbox provided in this embodiment is as follows: When the follow-up gearbox is working, the power is transmitted through the input shaft 500 and rotated by the double span support of the first bearing 300 and the second bearing 400. During this process, when the cutting part of the tunneling machine is in a large pitch angle posture, the oil passage on the outer surface of the bearing seat 200 uses its open path connecting the assembly through hole 201 with the outside to actively capture the splashed lubricating oil in the housing 100 that deviates from the bearing area due to the tilt of the posture and guide it continuously to the inside of the assembly through hole 201, directly wetting the spaced first bearing 300 and second bearing 400, ensuring that the oil supply is not interrupted in the displacement state. At the same time, the axial spacing of the double bearings provides a large span radial constraint for the input shaft 500 under strong vibration conditions, effectively limiting the shaft center offset. The cover 700 and the oil seal 600 close the outer end of the assembly through hole 201 to prevent the guide oil from leaking out and maintain the internal pressure stability, thereby achieving reliable lubrication and precise centering of the bearings simultaneously during the operation process of pitching and vibration impact.

[0027] The following embodiments illustrate the details of the follower gearbox of this application by way of example.

[0028] Please refer to Figures 1-5In this embodiment, optionally, the follower gearbox includes a housing 100, a bearing housing 200, a first bearing 300, a second bearing 400, an input shaft 500, an oil seal 600, a cover 700, a spacer ring 800, a locking nut 900, a bushing 910, a sealing ring 920, an oil seal pressure plate 930, and fixing bolts 940. The bearing housing 200 and the cover 700 are both mounted on the housing 100, with the cover 700 located outside the bearing housing 200. The first bearing 300 and the second bearing 400 are both mounted inside the bearing housing 200. The spacer ring 800 is sleeved around the input shaft 500, and is located between the first bearing 300 and the second bearing 400. The input shaft 500 passes sequentially through the first bearing 300, the second bearing 400, and the cover 700. A locking nut 900 is screwed onto the input shaft 500, located on the side of the second bearing 400 furthest from the first bearing 300 and in contact with the inner ring of the second bearing 400. A bushing 910 is fitted over the input shaft 500 with an interference fit. A sealing ring 920 is fitted over the input shaft 500 and located inside the bushing 910. An oil seal 600 is located between the bushing 910 and the cover 700. An oil seal pressure plate 930 is fixedly connected to the bearing housing 200 by fixing bolts 940, located on the outside of the bearing housing 200, preventing the oil seal 600 from dislodging from the cover 700.

[0029] Please refer to Figures 3-4 Optionally, the bearing housing 200 includes a plate 210, a first boss 220, a second boss 230, a first oil baffle 240, and a second oil baffle 250. The plate 210, the first boss 220, and the second boss 230 are integrally formed. The first boss 220 is located on one surface of the plate 210, and the second boss 230 is located on the end face of the first boss 220 away from the plate 210. When the bearing housing 200 is connected to the housing 100, the side of the plate 210 away from the first boss 220 is the outer side of the bearing housing 200, and correspondingly, the side of the plate 210 connected to the first boss 220 is the inner side. The bearing housing 200 is provided with a mounting through hole 201 that simultaneously penetrates the plate 210, the first boss 220, and the second boss 230. The mounting through hole 201 can be a stepped hole, with the larger diameter section of the mounting through hole 201 located closer to the outer side of the plate 210, and correspondingly, the smaller diameter section of the mounting through hole 201 located closer to the second boss 230. An annular stepped surface is formed between the larger and smaller diameter sections. The first bearing 300, the second bearing 400, and the spacer ring 800 are all located within the larger diameter section of the mounting through hole 201, with the outer ring of the first bearing 300 contacting the annular stepped surface. The first oil baffle 240 is connected to the first boss 220, and the second oil baffle 250 is connected to the second boss 230. The first oil baffle 240 and the second oil baffle 250 can be assembled with bolts, facilitating disassembly, replacement, and maintenance.

[0030] Meanwhile, the bearing housing 200 is provided with an oil passage hole and an oil return hole 204. One end of the oil passage hole penetrates the wall of the mounting through hole 201, and the other end is located on the outer surface of the bearing housing 200. Correspondingly, one end of the oil return hole 204 penetrates the wall of the mounting through hole 201, and the other end is located on the outer surface of the bearing housing 200. The oil passage hole is located above the oil return hole 204. Lubricating oil in the housing 100 can enter the mounting through hole 201 through the oil passage hole, and then flow back into the housing 100 through the oil return hole 204.

[0031] Please refer to Figures 3-4 In this embodiment, there are two oil passages, referred to as the first oil passage 202 and the second oil passage 203 for ease of description. Both the first oil passage 202 and the second oil passage 203 are circular through holes. The axes of both holes form an acute angle with the axis of the mounting through hole 201, which extends the length of both holes, thereby increasing the amount of lubricating oil stored and prolonging the lubrication time. One end of the first oil passage 202 penetrates the wall of the mounting through hole 201, and the other end is located on the outer peripheral surface of the first boss 220. One end of the second oil passage 203 penetrates the wall of the mounting through hole 201, and the other end is located on the outer peripheral surface of the second boss 230. The ports of both the first oil passage 202 and the second oil passage 203 that connect to the mounting through hole 201 are inclined towards the outer side of the plate 210. Specifically, the first oil passage 202 penetrates the wall of the assembly through hole 201 and is located between the second bearing 400 and the through cover 700, while the second oil passage 203 penetrates the wall of the assembly through hole 201 and is located between the first bearing 300 and the second bearing 400.

[0032] Please refer to Figures 3-4 Furthermore, a first oil storage groove 205 is provided on the outer peripheral surface of the first boss 220. Axially along the mounting through hole 201, the side of the first oil storage groove 205 away from the plate 210 is set as an open side. The first oil baffle 240 is fixedly connected to the end face of the first boss 220 and covers this open side. The port of the first oil passage 202 away from the mounting through hole 201 connects to the bottom wall of the first oil storage groove 205. In this way, lubricating oil can be stored in the first oil storage groove 205. When the gearbox is at a large downward angle, the lubricating oil in the first oil storage groove 205 can be input into the mounting through hole 201 through the first oil passage 202 to lubricate the side of the second bearing 400 away from the first bearing 300.

[0033] Similarly, a second oil storage groove 206 is provided on the outer peripheral surface of the second boss 230. Axially, the side of the second oil storage groove 206 away from the plate 210 is set as an open side, and the second oil baffle 250 is fixedly connected to the end face of the second boss 230 and blocks this open side. The port of the second oil passage 203 away from the assembly through hole 201 connects to the bottom wall of the second oil storage groove 206. In this way, lubricating oil can be stored in the second oil storage groove 206. When the gearbox is at a large downward angle, the lubricating oil in the second oil storage groove 206 can be input into the assembly through hole 201 through the second oil passage 203, and enter between the first bearing 300 and the second bearing 400, simultaneously lubricating the first bearing 300 and the second bearing 400.

[0034] It should be understood that there can be two oil return holes 204, arranged symmetrically. The height of each oil return hole 204 penetrating the wall of the assembly through hole 201 is higher than the lowest point of the wall of the assembly through hole 201. This prevents the lubricating oil in the assembly through hole 201 from being completely drained, ensuring that a certain amount of lubricating oil is always maintained in the assembly through hole 201 during gearbox operation, thus guaranteeing lubrication. Due to the design of the oil return holes 204, the lubricating oil can be discharged in a timely manner, reducing the pressure generated at the oil seal 600 and lowering the probability of leakage.

[0035] In this embodiment, optionally, both the first bearing 300 and the second bearing 400 can be configured as angular contact ball bearings, or, in some embodiments, one of the first bearing 300 and the second bearing 400 can be configured as an angular contact ball bearing. Angular contact ball bearings have a strong centering effect, improve shaft system stiffness, and effectively improve the problem of failure of the first bearing 300 and the second bearing 400 due to poor centering caused by large vibration of the input shaft 500.

[0036] In this embodiment, optionally, a shoulder 510 is provided on the outer circumferential surface of the input shaft 500. The side of the inner ring of the first bearing 300 away from the second bearing 400 contacts the shoulder 510, achieving axial one-sided limiting. When the locking nut 900 is screwed onto the input shaft 500, the locking nut 900 can contact the inner ring of the second bearing 400, achieving axial other-sided limiting. In this way, the axial degrees of freedom of the first bearing 300 and the second bearing 400 are restricted.

[0037] Please refer to Figure 3 and Figure 5In this embodiment, optionally, the spacer ring 800 is provided with a radial through hole 810, an axial through hole 820, and an annular groove 830. The radial through hole 810 extends radially along the spacer ring 800, the axial through hole 820 extends axially along the spacer ring 800, and the annular groove 830 is located on the outer circumferential surface of the spacer ring 800. The second oil passage 203 connects to the opening of the annular groove 830, one end of the radial through hole 810 connects to the bottom of the annular groove 830, and the other end of the radial through hole 810 connects to the axial through hole 820. The two ends of the axial through hole 820 are used to deliver lubricating oil to the first bearing 300 and the second bearing 400, respectively. It is worth noting that there can be multiple radial through holes 810 and multiple axial through holes. Multiple radial through holes 810 are evenly spaced along the circumference of the spacer ring 800, and multiple axial through holes 820 are also evenly spaced along the circumference of the spacer ring 800. One end of each radial through hole 810 is connected to the annular groove 830, and the other end is connected to the corresponding axial through hole 820. In this way, lubricating oil entering through the second oil passage 203 can enter the annular groove 830, flow along the annular groove 830 into the multiple radial through holes 810, and then exit from the corresponding axial through hole 820, effectively lubricating the first bearing 300 and the second bearing 400 at different positions along the circumference.

[0038] It should be understood that the sealing ring 920 can be a sealing ring.

[0039] It is worth noting that the follower gearbox obviously also includes an output shaft 950 and a gear transmission assembly 960. The input shaft 500 is connected to the output shaft 950 via the gear transmission assembly 960. Existing structures can be referenced, and no specific limitation is made in this embodiment. The gear transmission assembly 960 can be a planetary gear assembly, a parallel gear assembly, or a combination of both.

[0040] The follower gearbox provided in this embodiment, through the arrangement of the first oil passage 202 and the second oil passage 203, can guide lubricating oil to the locations of the first bearing 300 and the second bearing 400, thereby effectively lubricating the first bearing 300 and the second bearing 400. Combined with the first oil reservoir 205 and the second oil reservoir 206, the oil storage capacity can be increased, ensuring sufficient lubricating oil reaches the first bearing 300 and the second bearing 400 even when the gearbox has a large tilt angle. Simultaneously, both the first bearing 300 and the second bearing 400 are angular contact ball bearings. Angular contact ball bearings have a strong centering effect, effectively improving shaft rigidity and mitigating the problem of failure of the first bearing 300 and the second bearing 400 due to poor centering caused by large vibrations of the input shaft 500.

[0041] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A follower-type gearbox, characterized in that, include: Housing (100), bearing housing (200), first bearing (300), second bearing (400), input shaft (500), oil seal (600) and cover (700); The bearing housing (200) is provided with an assembly through hole (201) and an oil passage hole. One end of the oil passage hole penetrates the hole wall of the assembly through hole (201), and the other end is located on the outer surface of the bearing housing (200). The oil passage hole is used to guide lubricating oil into the assembly through hole (201). The bearing housing (200) is mounted on the housing (100). The first bearing (300) and the second bearing (400) are both mounted in the assembly through hole (201) and are arranged at intervals in the axial direction of the assembly through hole (201). The cover (700) is mounted on the bearing housing (200) and is located on the outside of the bearing housing (200). The input shaft (500) passes through the first bearing (300), the second bearing (400) and the cover (700) in sequence. The oil seal (600) is disposed between the bearing housing (200) and the input shaft (500).

2. The follower gearbox according to claim 1, characterized in that: There are two oil passage holes. One of the oil passage holes penetrates the wall of the assembly through hole (201) and is located between the first bearing (300) and the second bearing (400). The other oil passage hole penetrates the wall of the assembly through hole (201) and is located between the second bearing (400) and the through cover (700).

3. The follower gearbox according to claim 1, characterized in that: An oil storage groove is also provided on the outer surface of the bearing housing (200), and the end of the oil passage hole away from the assembly through hole (201) is connected to the oil storage groove.

4. The follower gearbox according to claim 3, characterized in that: The bearing housing (200) includes an integral plate (210) and a boss, the boss being located on one surface of the plate (210), and the mounting through hole (201) passing through both the plate (210) and the boss; The oil storage groove is disposed on the outer peripheral surface of the boss, and the end of the oil passage hole away from the assembly through hole (201) penetrates the bottom wall of the oil storage groove.

5. The follower gearbox according to claim 4, characterized in that: The bearing housing (200) also includes an oil baffle; The oil storage groove on the side away from the plate (210) in the axial direction of the assembly through hole (201) is set as an open side, and the oil baffle is fixedly connected to the boss and covers the open side.

6. The follower gearbox according to any one of claims 1-5, characterized in that: The bearing housing (200) is also provided with an oil return hole (204). One end of the oil return hole (204) penetrates the wall of the assembly through hole (201), and the other end of the oil return hole (204) is located on the outer surface of the bearing housing (200). The oil return hole (204) is located below the oil through hole.

7. The follower gearbox according to claim 6, characterized in that: The height of the oil return hole (204) penetrating the wall of the assembly through hole (201) is higher than the lowest position of the wall of the assembly through hole (201).

8. The follower gearbox according to any one of claims 1-5, characterized in that: The follower gearbox also includes a spacer ring (800), which is sleeved on the input shaft (500) and located between the first bearing (300) and the second bearing (400). The spacer ring (800) is provided with a radial through hole (810) and an axial through hole (820). One end of the radial through hole (810) is connected to the oil passage hole, and the other end of the radial through hole (810) is connected to the axial through hole (820). The two ends of the axial through hole (820) are used to deliver lubricating oil to the first bearing (300) and the second bearing (400), respectively.

9. The follower gearbox according to claim 8, characterized in that: An annular groove (830) is provided on the outer circumferential surface of the spacer ring (800); there are multiple radial through holes (810) and multiple axial through holes (820). The multiple radial through holes (810) are arranged at intervals in the circumferential direction of the spacer ring (800), and the multiple axial through holes (820) are arranged at intervals in the circumferential direction of the spacer ring (800). One end of each radial through hole (810) is connected to the annular groove (830), and the other end is connected to the corresponding axial through hole (820).

10. The follower gearbox according to any one of claims 1-5, characterized in that: The first bearing (300) and / or the second bearing (400) are configured as angular contact ball bearings.

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