Tail reduction input lubrication structure
By designing primary and secondary lubrication circuits and Archimedes threads in the input structure of the tail reducer, the problems of poor lubrication and spline wear were solved, achieving effective oil delivery and lubrication, and improving the wear resistance and dry running capability of bearings and splines.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- AECC HUNAN AVIATION POWERPLANT RES INST
- Filing Date
- 2026-03-23
- Publication Date
- 2026-06-09
AI Technical Summary
The existing helicopter tail gearbox input structure has problems with poor lubrication and severe spline wear. In particular, when the tapered roller bearing rotates, centrifugal force affects the distribution of lubricating oil, and the grease cannot effectively remove metal shavings.
A tail reducer input lubrication structure was designed. Utilizing the "oil pump" function of the tail reducer input gear, the primary and secondary lubrication circuits of lubricating oil are realized through the design of oil guide sleeves and oil passages. This ensures the directional flow of lubricating oil and lubricates the bearings and splines. Archimedes threads are used to enhance the flow of lubricating oil, and lip seals and plugs are combined to prevent lubricating oil leakage.
It achieves effective oil delivery and lubrication, improves the wear resistance of bearings and splines, ensures the storage and dry running capabilities of lubricating oil, and reduces the risk of wear.
Smart Images
Figure CN122170223A_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the field of speed reducer technology, and specifically relates to an input lubrication structure for a tail speed reducer. Background Technology
[0002] Existing helicopter tail gearbox input mounting structure, such as Figure 1 As shown, the input flange 1 of the tail reducer is mounted outside the input gear 2 of the tail reducer. It is centered by the positioning cylindrical section on the inner side of the spline pair, transmits torque using splines, and is locked with the shaft end flange nut 3. The plug 6 prevents foreign objects from entering the reducer. The input assembly is supported by the large bearing 4 and the small bearing 5. The oil is churned by the tail reducer input gear 2, first lubricating the large bearing 4, then flowing to the small bearing 5, and finally flowing into the oil sump. The dynamic seal 7 is used for sealing. The spline pair between the tail reducer input gear 2 and the tail reducer input flange 1 is lubricated with grease. However, the above technical solution has the following defects: 1) Due to the centrifugal force of the tapered roller bearings (large bearing 4 and small bearing 5) during rotation, an attractive force is generated from the small end to the large end, forming an "oil pump" effect. This will affect the lubricating oil from entering the bearing directly after being stirred by the gears, causing the lubricating oil to not flow smoothly into the bearing.
[0003] 2) The spline is lubricated with grease. Once the spline wears, the metal shavings produced cannot be discharged, which will lead to accelerated spline wear. Since fault monitoring is not possible, it may affect the safety of the reducer.
[0004] Therefore, there is a need for a tail reducer that uses lubricating oil and can deliver the lubricating oil through bearings. Summary of the Invention
[0005] To address the aforementioned issues, this application proposes an input lubrication structure for a tail reducer, comprising a tail reducer input gear and a tail reducer input flange. The tail reducer input gear is mounted on the outer surface of the tail reducer input flange, and the tail reducer input flange and the tail reducer input gear are connected by a spline. At least one set of bearings and oil guide sleeves are fitted on the outer surface of the tail reducer input gear, with each set of oil guide sleeves located at the end of the bearing furthest from the tail reducer input gear. The oil guide sleeve is engaged with the outer surface of the tail reduction input gear; the tail reduction input gearbox is installed on the outer surface of the bearing and the outer surface of the oil guide sleeve. The tail reduction input gearbox is provided with a second oil passage. The outlet of the second oil passage is directly opposite the oil guide sleeve, and the inlet of the second oil passage is connected to the oil sump.
[0006] Furthermore, the bearing includes a first bearing and a second bearing. The first bearing is mounted on the outer surface of the tail reduction input gear near the gear end. The second bearing is located at the end of the first bearing away from the tail reduction input gear. The inner rings of the second bearing and the first bearing are both fitted onto the outer surface of the tail reduction input gear, and the outer rings of the second bearing and the first bearing are both connected to the inner surface of the tail reduction input gear housing.
[0007] Furthermore, the oil guide sleeve includes a second oil guide sleeve, which is fitted onto the outer surface of the tail reduction input gear and installed on the side of the second bearing away from the first bearing. The second oil guide sleeve is directly opposite the outlet of the second oil passage of the tail reduction input gear housing.
[0008] Furthermore, the oil guide sleeve also includes a first oil guide sleeve, which is fitted onto the outer surface of the tail reduction input gear and is installed between the second bearing and the first bearing.
[0009] Furthermore, both the second and first oil guide sleeves have serrated thread grooves on their outer surfaces.
[0010] Furthermore, a first circular hole is provided on the outer wall of the tail reduction input gear, and a second circular hole is provided on the outer wall of the tail reduction input flange. The axis of the first circular hole and the axis of the second circular hole are located at the two ends of the spline, respectively; the first circular hole is directly opposite the oil guide screw sleeve.
[0011] Furthermore, the tail reducer input lubrication structure also includes a plug, which is fixedly installed inside the tail reducer input flange and is located on the side of the second circular hole away from the gear end of the tail reducer input gear.
[0012] Furthermore, the tail reducer input lubrication structure also includes the tail reducer main housing, which is installed on the outside of the tail reducer input housing; the tail reducer main housing is provided with a first oil passage, which is connected to a second oil passage.
[0013] Furthermore, the tail reducer input lubrication structure also includes a lip seal, which is installed between the tail reducer input casing and the oil guide sleeve. The outer surface of the oil guide sleeve that contacts the lip seal is coated with chromium oxide.
[0014] Furthermore, the tail reducer input lubrication structure also includes a locking nut, which is installed between the tail reducer input gear and the extension sleeve of the second oil guide sleeve, and the locking nut is connected to the tail reducer input gear.
[0015] Beneficial effects of this invention: 1. The tail reducer input lubrication structure of the present invention includes at least one set of bearings and oil guide sleeves fitted on the outer surface of the tail reducer input gear, each set of oil guide sleeves being located at the gear end of the bearing furthest from the tail reducer input gear; the oil guide sleeves are engaged with the outer surface of the tail reducer input gear; a tail reducer input housing is installed on the outer surface of the bearings and the outer surface of the oil guide sleeves, and a second oil passage is provided inside the tail reducer input housing, the outlet of the second oil passage being directly opposite the oil guide sleeve, and the inlet of the second oil passage being directly opposite the outlet of the first oil passage provided inside the tail reducer input housing; the present invention invents... The main lubrication circuit is designed by utilizing the "oil pump" function of the tail reducer input gear: lubricating oil enters the second oil passage on the tail reducer input casing from the oil sump through the first oil passage on the tail reducer main casing, and then flows into the sawtooth thread groove of the oil guide sleeve. Then, the tail reducer input gear drives the oil guide sleeve to pump the lubricating oil to the bearing for lubrication. At the same time, the rotation of the bearing drives the lubricating oil to flow from the oil guide sleeve through the bearing to the end away from the oil guide sleeve. The bearing and the oil guide sleeve drive the lubricating oil to flow in the same direction, thus ensuring that the lubricating oil eventually flows back to the oil sump.
[0016] 2. The outer surfaces of the second and first oil guide sleeves of the input lubrication structure of the tail reducer of the present invention are provided with serrated threads, which can enhance the directional flow of lubricating oil; at the same time, the first oil guide sleeve also serves as a bearing spacer sleeve to adjust the bearing clearance, reducing the number of parts; the extension sleeve of the second oil guide sleeve also serves as a mounting seat for the lip seal, and the surface of the mating part with the lip seal is sprayed with chromium oxide to reduce wear.
[0017] 3. The tail reducer input lubrication structure of the present invention has a first circular hole on the outer wall of the tail reducer input gear and a second circular hole on the outer wall of the tail reducer input flange. The axes of the first and second circular holes are located on both sides of the spline, respectively. The first circular hole is directly opposite the oil guide sleeve. Lubricating oil is agitated by the tail reducer input gear and enters its inner cavity. A plug is designed inside the tail reducer input flange to prevent lubricating oil from flowing out. The second circular hole on the tail reducer input flange facilitates the entry of lubricating oil into the spline pair between the tail reducer input flange and the tail reducer input gear. After completing spline lubrication, the lubricating oil enters the main lubrication circuit through the first circular hole on the tail reducer input gear, realizing oil lubrication of the spline. This is beneficial to improving the wear resistance of the spline, especially for floating spline structures, where the wear is greater than that of fixed splines, making oil lubrication particularly important. At the same time, the tail reducer input lubrication structure has a certain oil storage function, so that even after the lubricating oil in the oil sump at the bottom of the casing has leaked out, the input end can still store a portion of lubricating oil, thereby improving its dry running capability.
[0018] 4. The tail reducer input lubrication structure of the present invention also includes a lip seal, the outer cylindrical surface of which is connected to the inner wall of the tail reducer input casing; the inner lip of the lip seal is installed on the outer surface of the second oil guide sleeve, the lip of the lip seal contacts the delay sleeve of the second oil guide sleeve, the contact area is treated with chromium oxide spraying, and the outer cylindrical surface of the lip seal is designed with threads, which can be conveniently installed and disassembled by designing and using special tooling, and the lip seal is not easily damaged.
[0019] Other features and advantages of this application will be set forth in the following description and will be apparent in part from the description or may be learned by practicing the application. The objectives and other advantages of this application may be realized and obtained by means of the structures pointed out in the description and the accompanying drawings. Attached Figure Description
[0020] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0021] Figure 1 A schematic diagram of the existing helicopter tail gear reducer input mounting structure is shown in an embodiment of this application.
[0022] Figure 2 A schematic diagram of the main lubrication route of the tail reducer input lubrication structure according to an embodiment of this application is shown.
[0023] Figure 3 A schematic diagram of the secondary lubrication route of the input lubrication structure of the tail reducer according to an embodiment of this application is shown.
[0024] Figure 4 A schematic diagram of the second oil guide sleeve of the tail reducer input lubrication structure according to an embodiment of this application is shown.
[0025] Figure 5 A schematic diagram of the first oil guide sleeve of the tail reducer input lubrication structure according to an embodiment of this application is shown.
[0026] Figure 6 This diagram illustrates a structure where the thread standard at the shaft end of the input gear of the tail reducer in an embodiment of this application is ISO M.
[0027] Figure 7 The diagram shows a structural schematic of the tail reducer input gear of the tail reducer input lubrication structure according to an embodiment of this application, with the thread standard of DEF STAN 53-55 / 1 at the shaft end.
[0028] In the diagram, 1. Input flange; 2. Tail reduction input gear; 3. Shaft end flange nut; 4. Large bearing; 5. Small bearing; 6. Plug; 7. Dynamic seal; 10. Tail reducer input gear; 101. First circular hole; 11. Tail reducer input flange; 111. Second circular hole; 12. First bearing; 13. First oil guide sleeve; 131. First threaded groove; 14. Second oil guide sleeve; 141. Second threaded groove; 15. Tail reducer main housing; 16. Lip seal; 17. Plug; 18. Locking nut; 19. Second bearing; 20. Tail reducer input housing. Detailed Implementation
[0029] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0030] refer to Figure 1 A tail reducer input lubrication structure includes a tail reducer input gear 10 and a tail reducer input flange 11. The tail reducer input gear 10 is mounted on the outer surface of the tail reducer input flange 11, and the tail reducer input flange 11 and the tail reducer input gear 10 are connected by a spline. The outer surface of the tail reducer input gear 10 is fitted with two sets of bearings (including a first bearing 12 and a second bearing 19) and oil guide sleeves (including a first oil guide sleeve 13 and a second oil guide sleeve 14). The oil guide sleeves of each set are located at the end of the bearing away from the gear end of the tail reducer input gear 10. Specifically, the tail reducer input gear 10 is a bevel gear, and the extension tube of the bevel gear is fitted on the outer surface of the tail reducer input flange 11. The tail reducer input flange 11 and the extension tube of the bevel gear are engaged by a spline.
[0031] Furthermore, the oil guide sleeve engages with the outer surface of the tail reduction input gear 10; the tail reduction input housing 20 is mounted on the outer surface of the bearing and the outer surface of the oil guide sleeve. The tail reduction input housing 20 has a second oil passage inside, with one end of the second oil passage facing the oil guide sleeve, and the other end of the second oil passage communicating with the first oil passage on the tail reduction main housing. The other end of the first oil passage communicates with the oil sump. This invention creatively utilizes the "oil pump" function of the tail reduction input gear 10 to design the main lubrication circuit. Lubricating oil enters from the oil sump through the first oil passage on the tail reduction main housing 15 into the second oil passage on the tail reduction input housing 20, and then enters the serrated thread groove of the oil guide sleeve. The tail reduction input gear 10 drives the oil guide sleeve to pump the oil to the bearing for lubrication. Simultaneously, the bearing rotation drives the lubricating oil from the oil guide sleeve through the bearing to the end away from the oil guide sleeve. The bearing and the oil guide sleeve drive the lubricating oil to flow in the same direction, thus ensuring that the lubricating oil eventually flows back to the oil sump.
[0032] Specifically, this invention utilizes the "oil pump" function of the tail reduction input gear 10 to design a main lubrication circuit: the lubricating oil in the main lubrication circuit enters the second oil passage on the tail reduction input gearbox 20 from the oil sump through the first oil passage on the tail reduction main housing 15, and then enters the second threaded groove 141 of the second oil guide sleeve 14. Then, through the pumping action of the tail reduction input gear 10 driving the second oil guide sleeve 14 under rotation, the lubricating oil is delivered to the second bearing 19 for lubrication. The lubricated lubricating oil is then delivered to the first bearing 12 for lubrication through the pumping action of the first threaded groove 131 of the first oil guide sleeve 13 under rotation. The first bearing 12 is used as an "oil pump" to drive the lubricating oil from the first oil guide sleeve 13 to the gear end of the tail reduction input gear 10, which is consistent with the flow direction of the lubricating oil driven by the first oil guide sleeve 13, thereby ensuring that the lubricating oil eventually flows back to the oil sump.
[0033] refer to Figure 2 The bearings include a second bearing 19 and a first bearing 12. The first bearing 12 is mounted on the outer surface of the tail reduction input gear 10 near the gear end. The second bearing 19 is located on the side of the first bearing 12 away from the gear end of the tail reduction input gear 10. The inner rings of both the second bearing 19 and the first bearing 12 are fitted onto the outer surface of the tail reduction input gear 10, and the outer rings of both the second bearing 19 and the first bearing 12 are connected to the inner surface of the tail reduction input housing 20. Specifically, both the second bearing 19 and the first bearing 12 are tapered roller bearings. Typically, the first bearing 12 is larger than the second bearing 19, and the larger end of the first bearing is located on the side closer to the gear end of the tail reduction input gear 10.
[0034] Furthermore, the oil guide sleeve also includes a second oil guide sleeve 14, which is fitted onto the outer surface of the tail reduction input gear 10. The second oil guide sleeve 14 is installed on the side of the second bearing 19 away from the first bearing 12, and is directly opposite the outlet of the second oil passage of the tail reduction input housing 20. Specifically, the outer surface of the second oil guide sleeve 14 is provided with a second threaded groove 141, and the direction of rotation of the second threaded groove 141 is towards the second bearing 19. The tail reduction input gear 10 drives the second oil guide sleeve 14 to rotate, thereby driving the lubricating oil to flow to the second bearing 19, thus achieving lubrication of the second bearing 19.
[0035] Furthermore, the oil guide sleeve also includes a first oil guide sleeve 13, which is fitted onto the outer surface of the tail reduction input gear 10 and installed between the second bearing 19 and the first bearing 12. Specifically, the outer surface of the first oil guide sleeve 13 is provided with a first threaded groove 131, and the first threaded groove 131 rotates towards the first bearing 12. The tail reduction input gear 10 drives the first oil guide sleeve 13 to rotate, thereby driving the lubricating oil to flow to the first bearing 12, thus achieving lubrication of the first bearing 12.
[0036] Preferably, both the second oil guide sleeve 14 and the first oil guide sleeve 13 have serrated thread grooves on their outer surfaces. The second oil guide sleeve 14 and the first oil guide sleeve 13 are Archimedean threads, which enhance the directional flow of lubricating oil (effectively enhancing the pumping of lubricating oil from a lower to a higher position, i.e., from the second bearing 19 to the first bearing 12). The first oil guide sleeve 13 (7.5mm pitch, right-handed, reference) Figure 5 (The direction of rotation depends on the direction of rotation) also functions as a bearing spacer sleeve to adjust the clearance of the first bearing 12, reducing the number of parts; the first oil guide sleeve 13 (4mm pitch, right-handed, reference) Figure 4 The extension sleeve (the direction of rotation depends on the direction of rotation) is referenced. Figure 4 The left side of the extension sleeve also serves as the mounting base for the lip seal 16. The surface of the extension sleeve that mates with the lip seal 16 is coated with chromium oxide to reduce wear.
[0037] refer to Figure 1 The outer wall of the tail reduction input gear 10 is provided with a first circular hole 101, and the outer wall of the tail reduction input flange 11 is provided with a second circular hole 111. The axis of the first circular hole 101 and the axis of the second circular hole 111 are located at the two ends of the spline, respectively; the first circular hole 101 is directly opposite the oil guide screw sleeve.
[0038] Specifically, to achieve oil lubrication of the spline, a secondary lubrication circuit is designed. The lubricating oil in the secondary lubrication circuit is agitated by the tail reducer input gear 10 and enters its internal cavity. A plug 17 is designed at the tail reducer input flange 11 to prevent oil leakage. Five to eight evenly distributed φ12 second circular holes 111 are designed on the tail reducer input flange 11 to facilitate oil entry into the spline pair between the tail reducer input flange 11 and the tail reducer input gear 10. After spline lubrication, the lubricating oil enters the main lubrication circuit through two to four evenly distributed φ4 first circular holes 101 designed on the tail reducer input gear 10, thus achieving oil lubrication of the spline. This improves the wear resistance of the spline, especially for floating spline structures where wear is greater than that of fixed splines, making oil lubrication particularly important. Simultaneously, this tail reducer input lubrication structure has a certain oil storage function, allowing some lubricating oil to remain at the input end even after the oil sump at the bottom of the casing has completely leaked out, thereby improving its dry-running capability.
[0039] refer to Figure 2 The tail reducer input lubrication structure also includes a plug 17, which is fixedly installed inside the tail reducer input flange 11 and located on the side of the second circular hole 111 away from the gear end of the tail reducer input gear 10. The plug 17 is used to prevent lubricating oil from flowing out of the tail reducer input flange 11.
[0040] Furthermore, the tail reduction main housing 15 is installed on the outside of the tail reduction input housing 20. The tail reduction main housing 15 is connected to the tail reduction input housing 20 by a ring (usually 6-12) of double-ended studs and self-locking nuts set on the outside of the tail reduction input housing 20. The tail reduction main housing 15 is provided with a first oil passage, which is connected to a second oil passage.
[0041] Furthermore, the input lubrication structure of the tail reducer also includes a lip seal 16. The outer cylindrical surface of the lip seal 16 is threaded, and it is connected to the inner wall of the tail reducer input casing 20 through the thread. The inner lip of the lip seal 16 is installed on the outer surface of the extension sleeve of the second oil guide sleeve 14. The contact area between the lip seal 16 and the second oil guide sleeve 14 is treated with chromium oxide spraying (e.g., ...). Figure 4 (As shown). The shaft end of the tail reduction input gear 10 is secured with a lock nut 18 to prevent loosening. To reduce deformation, the radial force needs to be reduced. To reduce the radial force while ensuring the axial force, a sawtooth thread is recommended; the standard selected is DEF STAN 53-55 / 1 (reference). Figure 7 ), compared to using the commonly used ISO M (reference) Figure 6 The standard is more conducive to reducing radial deformation, facilitating installation, and ensuring uniform stress on the threads.
[0042] refer to Figure 4The second oil guide sleeve 14 has a sleeve on the side near the lip seal 16. The outer surface of the sleeve is coated with chromium oxide, and a locking nut 18 is installed on the inner surface of the sleeve. Specifically, the lip seal 16 is a hollow disc with a cylindrical outer surface and two end faces. The outer cylindrical surface is threaded, and the thread connects to the inner wall of the tail reducer input casing 20. It can be easily installed and disassembled by designing and using special tooling, and the lip seal 16 is not easily damaged.
[0043] Furthermore, the locking nut 18 is installed between the tail reduction input gear 10 and the second oil guide sleeve 14, and is connected to the tail reduction input gear 10 by threads, and the stop ring prevents loosening.
[0044] Working principle of this invention: The lubrication path of the tail reducer's input lubrication structure is as follows: main lubrication circuit (e.g., Figure 2 As shown, the main lubrication is provided for two bearings (first bearing 12 and second bearing 19): the lubricating oil enters the second oil guide sleeve 14 from the oil sump through the first oil passage on the tail reducer main casing 15 and the second oil passage on the tail reducer input casing 20. Then, the lubricating oil is delivered to the second bearing 19 for lubrication by the pumping action of the second oil guide sleeve 14 under rotation. Then, the lubricating oil is delivered to the first bearing 12 for lubrication by the pumping action of the first oil guide sleeve 13 under rotation, ensuring that the lubricating oil eventually flows back to the oil sump.
[0045] Secondary lubrication circuit (primarily lubricating the spline): Lubricating oil enters the inner cavity of the tail reducer input gear 10 through agitation. A plug 17 inside the tail reducer input flange 11 prevents oil leakage. Five to eight evenly spaced φ12 second circular holes 111 on the tail reducer input flange 11 facilitate oil entry into the spline pair between the tail reducer input flange 11 and the tail reducer input gear 10. After spline lubrication, the oil enters the main lubrication circuit through two to four evenly spaced φ4 first circular holes 101 on the tail reducer input gear 10, achieving oil lubrication of the spline. This improves the spline's wear resistance, especially important for floating spline structures where wear is greater than that of fixed splines. Simultaneously, this structure has a certain oil storage function, allowing some lubricating oil to remain at the input end even after the oil sump has completely leaked out, thus improving its dry-running capability.
[0046] Furthermore, the tapered roller bearing of the first bearing 12 generates centrifugal force during operation, causing lubricating oil to flow from its smaller end to its larger end; however, the usual approach in lubricating oil path design is to utilize gravity to allow the lubricating oil to flow from higher to lower (i.e., Figure 3(The red arrows in the markings point in opposite directions). For the bearing above, the oil flows from the large end to the small end, which is the opposite of the usual design flow direction. This invention utilizes the function of an oil pump and further designs two Archimedean threaded sleeves (the first oil guide sleeve 13 and the second oil guide sleeve 14) to enhance the directional flow of lubricating oil from low to high (i.e., Figure 3 (The direction of the red arrow in the label).
[0047] This invention provides an input lubrication structure for a tail reducer. Two Archimedean threaded sleeves are designed in the tail reducer input assembly, creating a primary and secondary lubrication loops for the lubricating oil at the input end during operation. This lubrication is achieved for the bearings and splines at both locations, improving the wear resistance of the splines. Finally, the lubricating oil in the input assembly flows back to the tail reducer main housing 15, promptly removing heat generated by the bearings. Simultaneously, this structure has a certain oil storage function, allowing some lubricating oil to remain at the input end even after the oil sump has completely drained, thereby improving its dry-running capability.
[0048] Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.
Claims
1. A tail reducer input lubrication structure, characterized in that, It includes a tail reduction input gear (10) and a tail reduction input flange (11). The tail reduction input gear (10) is mounted on the outer surface of the tail reduction input flange (11), and the tail reduction input flange (11) and the tail reduction input gear (10) are connected by a spline. At least one set of bearings and oil guide sleeves are fitted on the outer surface of the tail reduction input gear (10), and each set of oil guide sleeves is located at the end of the bearing away from the tail reduction input gear (10). The oil guide sleeve is engaged with the outer surface of the tail reduction input gear (10); the outer surface of the bearing and the outer surface of the oil guide sleeve are equipped with a tail reduction input housing (20), and the tail reduction input housing (20) is provided with a second oil passage inside. The outlet of the second oil passage is directly opposite the oil guide sleeve, and the inlet of the second oil passage is connected to the oil sump.
2. The tail reducer input lubrication structure according to claim 1, characterized in that, The bearing includes a first bearing (12) and a second bearing (19). The first bearing (12) is mounted on the outer surface of the tail reduction input gear (10) near the gear end. The second bearing (19) is located at the end of the first bearing (12) away from the tail reduction input gear (10). The inner rings of the second bearing (19) and the first bearing (12) are both fitted onto the outer surface of the tail reduction input gear (10). The outer rings of the second bearing (19) and the first bearing (12) are both connected to the inner surface of the tail reduction input housing (20).
3. The tail reducer input lubrication structure according to claim 2, characterized in that, The oil guide sleeve includes a second oil guide sleeve (14), which is fitted on the outer surface of the tail reduction input gear (10) and installed on the side of the second bearing (19) away from the first bearing (12). The second oil guide sleeve (14) is directly opposite the outlet of the second oil passage of the tail reduction input gearbox (20).
4. The tail reducer input lubrication structure according to claim 3, characterized in that, The oil guide sleeve also includes a first oil guide sleeve (13), which is fitted on the outer surface of the tail reduction input gear (10) and is installed between the second bearing (19) and the first bearing (12).
5. The tail reducer input lubrication structure according to claim 4, characterized in that, The outer surfaces of the second oil guide sleeve (14) and the first oil guide sleeve (13) are both provided with serrated thread grooves.
6. The tail reducer input lubrication structure according to any one of claims 1-5, characterized in that, The outer wall of the tail reduction input gear (10) is provided with a first circular hole (101), and the outer wall of the tail reduction input flange (11) is provided with a second circular hole (111). The axis of the first circular hole (101) and the axis of the second circular hole (111) are located at the two ends of the spline, respectively. The first circular hole (101) is directly opposite the oil guide screw sleeve.
7. The tail reducer input lubrication structure according to claim 6, characterized in that, The tail reducer input lubrication structure also includes a plug (17), which is fixedly installed inside the tail reducer input flange (11) and is located on the side of the second round hole (111) away from the gear end of the tail reducer input gear (10).
8. The tail reducer input lubrication structure according to claim 1, characterized in that, The tail reducer input lubrication structure also includes a tail reducer main housing (15), which is installed on the outside of the tail reducer input housing (20); a first oil passage is provided in the tail reducer main housing (15), and the first oil passage is connected to a second oil passage.
9. The tail reducer input lubrication structure according to claim 8, characterized in that, The tail reducer input lubrication structure also includes a lip seal (16), which is installed between the tail reducer input casing (20) and the oil guide sleeve. The outer surface of the oil guide sleeve that contacts the lip seal (16) is coated with chromium oxide.
10. The tail reducer input lubrication structure according to claim 8, characterized in that, The tail reducer input lubrication structure also includes a locking nut (18), which is installed between the tail reducer input gear (10) and the extension sleeve of the second oil guide sleeve (14), and the locking nut (18) is connected to the tail reducer input gear (10).