Rotary seal structure

Abstract

A rotary sealing structure relates to the field of gearboxes, which comprises a gearbox, an output unit, a skeleton oil seal and two supporting bearings; the output unit is rotatably installed in the gearbox through the two supporting bearings; the output unit has an output end and an axial sealing surface; the skeleton oil seal is provided with an axial sealing lip, the skeleton oil seal is installed on the output unit, and the two supporting bearings are located on the side of the skeleton oil seal close to the output end; the axial sealing surface and the axial sealing lip are in sealing contact under the action of the pre-tightening force in the axial direction of the output unit. It can reduce the size and weight, reduce the processing and manufacturing cost; it can also prolong the service life of the bearing and reduce the maintenance cost.

Description

Technical Field

[0001] This utility model relates to the field of gearboxes, and more specifically, to a rotary sealing structure. Background Technology

[0002] like Figure 1 As shown, the output assembly of existing yaw and pitch gearboxes typically uses two back-to-back tapered roller bearings for support and positioning. A double-skeletal oil seal is used to seal between the two tapered roller bearings, and the output shaft is connected to the planetary carrier via an external spline. The two tapered roller bearings are directly mounted on the output shaft and preloaded with round nuts. The overall length of the output assembly is determined by Ls + Ln + Lb1 + Lw (bearing span) + Lb2 + Lg + Lp. This results in a large size and weight of the output gear shaft, leading to high costs. Furthermore, the skeleton oil seal is located between the two bearings, resulting in a low oil level and increased lubrication volume. To facilitate better replacement of the gearbox's internal lubricating oil, a drain plug is generally also located between the two tapered roller bearings and above the skeleton oil seal, further increasing the bearing span Lw; and contaminated oil and debris accumulate below one bearing, shortening its service life. Utility Model Content

[0003] The objectives of this invention include, for example, providing a rotary sealing structure that can reduce size and weight, lower manufacturing costs, extend bearing life, and reduce maintenance costs.

[0004] The embodiments of this utility model can be implemented as follows:

[0005] In a first aspect, this utility model provides a rotary sealing structure, comprising:

[0006] The gearbox, output unit, skeleton oil seal, and two support bearings are provided. The output unit is rotatably mounted in the gearbox via the two support bearings. The output unit has an output end and an axial sealing surface. The skeleton oil seal is provided with an axial sealing lip and is mounted on the output unit. The two support bearings are both located on the side of the skeleton oil seal closer to the output end.

[0007] The axial sealing surface and the axial sealing lip are in sealing contact under the action of a preload force along the axial direction of the output unit.

[0008] In an optional embodiment, the output unit includes an output gear shaft, a planetary carrier, and a lock nut; the output gear shaft is rotatably connected to the gearbox via the two support bearings; the planetary carrier and the lock nut are both fixedly connected to the output gear shaft, and the lock nut is located between the planetary carrier and the support bearings;

[0009] The skeleton oil seal is installed on the planetary carrier or the locking nut.

[0010] In an optional embodiment, the locking nut includes an integral first ring body and a second ring body, the outer diameter of the first ring body being smaller than the outer diameter of the second ring body, and one end of the second ring body having an annular surface surrounding the first ring body; at least a portion of the annular surface is configured as the axial sealing surface.

[0011] In an optional embodiment, the rotary seal structure further includes an axial locking member connected to the gearbox, which contacts the side of the skeleton oil seal away from the axial sealing lip to limit the axial sealing lip from moving away from the axial sealing surface.

[0012] In an optional embodiment, the axial locking member includes a threaded member and an elastic member, the elastic member being fixedly connected to the gearbox via the threaded member, and the elastic member contacting the side of the skeleton oil seal away from the axial sealing lip.

[0013] In an optional implementation, the elastic element is configured as an elastic washer or a spring.

[0014] In an optional embodiment, the output unit includes a sealing ring, the axial sealing surface is disposed on the sealing ring, and the sealing ring is fixedly connected to the planetary carrier or the locking nut.

[0015] In an optional embodiment, the skeleton oil seal is further provided with a radial sealing lip, which is located on the side of the axial sealing lip away from the support bearing; the radial sealing lip is in sealing engagement with the output unit.

[0016] In an optional embodiment, the rotary seal structure further includes a magnetic drain plug connected to the gearbox, the magnetic drain plug being located on the side of the skeleton oil seal away from the support bearing.

[0017] In an optional embodiment, both the gearbox and / or the skeleton oil seal are provided with chip grooves, which are located on the side of the support bearing away from the output end.

[0018] The beneficial effects of this utility model embodiment include, for example:

[0019] In summary, the rotary sealing structure provided in this embodiment, by placing the skeleton oil seal on the same side of the two support bearings, eliminates the need to reserve space between the two support bearings for installing the skeleton oil seal. This effectively reduces the distance between the two support bearings, thereby shortening the overall axial dimension, reducing the overall weight, and lowering manufacturing costs. Simultaneously, the skeleton oil seal and the output unit adopt an axial sealing structure, making them insensitive to radial eccentricity of components. This effectively reduces the adverse effects of radial eccentricity caused by machining and assembly errors, improving sealing reliability. Furthermore, oil stains or wear debris carried in the lubricating oil are less likely to settle below the support bearings, effectively extending the service life of the support bearings. Attached Figure Description

[0020] 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.

[0021] Figure 1 This is a schematic diagram of a sealing structure in the prior art;

[0022] Figure 2 A schematic diagram of the rotary sealing structure in this embodiment;

[0023] Figure 3 for Figure 2 A magnified schematic diagram of the local structure;

[0024] Figure 4 This is a schematic diagram of the deformation of the axial locking component in this embodiment;

[0025] Figure 5 This is a schematic diagram of a modified skeleton oil seal according to this embodiment;

[0026] Figure 6 This is a modified schematic diagram of the output unit in this embodiment;

[0027] Figure 7 This is a schematic diagram of a variation of the rotary sealing structure in this embodiment.

[0028] icon:

[0029] 100-Gearbox; 101-Assembly through hole; 102-First stop; 103-Second stop; 104-Third stop; 105-Drain hole; 106-Second chip groove; 200-Output unit; 210-Output gear shaft; 211-Output end; 212-Shoulder; 220-Planetary carrier; 230-Locking nut; 231-First ring body; 232-Second ring body; 233-Axial sealing surface; 240-Sealing ring; 300-Skeleton oil seal; 310-Axial sealing lip; 320-Radial sealing lip; 330-First chip groove; 400-First support bearing; 500-Second support bearing; 600-Axial locking element; 610-Threaded element; 620-Elastic element; 700-Magnetic drain plug. Detailed Implementation

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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 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.

[0034] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0035] 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.

[0036] Please refer to Figure 2 and Figure 3 This embodiment provides a rotary sealing structure, which includes a gearbox 100, an output unit 200, a skeleton oil seal 300, and two support bearings. The output unit 200 is rotatably mounted in the gearbox 100 via the two support bearings. The output unit 200 has an output end 211 and an axial sealing surface 233. The skeleton oil seal 300 is provided with an axial sealing lip 310. The skeleton oil seal 300 is mounted on the output unit 200, and both support bearings are located on the side of the skeleton oil seal 300 near the output end 211. The axial sealing surface 233 and the axial sealing lip 310 are in sealing contact under the action of a preload force along the axial direction of the output unit 200.

[0037] As described above, the sealing principle of the rotary sealing structure provided in this embodiment is as follows:

[0038] When the lubricating oil inside the gearbox 100 reaches the skeleton oil seal 300, the axial sealing lip 310 of the skeleton oil seal 300 and the axial sealing surface 233 on the output unit 200 make sealing contact, blocking the lubricating oil and preventing leakage. Because the axial sealing lip 310 and the axial sealing surface 233 are in axial sealing contact, it is not sensitive to radial eccentricity of components, effectively reducing the adverse effects of radial eccentricity caused by machining and assembly errors, and improving sealing reliability. Oil stains or wear debris carried in the lubricating oil are less likely to settle below the support bearings, effectively extending the service life of the support bearings. Simultaneously, by placing the skeleton oil seal 300 on the same side of the two support bearings, there is no need to reserve space between the two support bearings for installing the skeleton oil seal 300, effectively reducing the distance between the two support bearings, thereby shortening the overall axial dimension, reducing the overall weight, and lowering manufacturing costs.

[0039] The following embodiments illustrate the details of the rotary sealing structure of this application by way of example.

[0040] Please refer to Figures 2-7In this embodiment, optionally, the rotary sealing structure includes a gearbox 100, an output unit 200, a skeleton oil seal 300, a first support bearing 400, a second support bearing 500, an axial locking member 600, and a magnetic drain plug 700. The output unit 200 is rotatably mounted on the gearbox 100 via the first support bearing 400 and the second support bearing 500. The skeleton oil seal 300 is mounted on the gearbox 100 via the axial locking member 600, and is located between the output unit 200 and the gearbox 100, capable of sealing the gap between them. The first support bearing 400 and the second support bearing 500 are located on the same side of the skeleton oil seal 300. The magnetic drain plug 700 is mounted on the gearbox 100, and is located on the side of the skeleton oil seal 300 away from the first support bearing 400 and the second support bearing 500.

[0041] Optionally, the gearbox 100 is provided with an assembly through hole 101 and an oil drain hole 105. The oil drain hole 105 is located on the side wall of the gearbox 100 and communicates with the assembly through hole 101. The wall of the assembly through hole 101 is provided with a first stop 102, a second stop 103, and a third stop 104, all of which are annular. The first stop 102, the second stop 103, and the third stop 104 are arranged sequentially along the axial direction of the assembly through hole 101. One side of the outer ring of the first support bearing 400 contacts the first stop 102, restricting the axial movement of the outer ring of the first support bearing 400. One side of the outer ring of the second support bearing 500 contacts the second stop 103, restricting the axial movement of the outer ring of the second support bearing 500. An axial locking member 600 is connected to the third stop 104. A magnetic oil drain plug 700 is installed inside the oil drain hole 105.

[0042] Optionally, the output unit 200 includes an output gear shaft 210, a planetary carrier 220, and a locking nut 230. The output gear shaft 210 passes through the mounting through hole 101 and is rotatably connected to the gearbox 100 via a first support bearing 400 and a second support bearing 500. The planetary carrier 220 and the locking nut 230 are both fixedly connected to the output gear shaft 210, with the locking nut 230 located between the planetary carrier 220 and the second support bearing 500.

[0043] Furthermore, one end of the output gear shaft 210 is designated as an output end 211, which extends out of the mounting through hole 101. A shoulder 212 is provided on the outer circumferential surface of the output gear shaft 210, and one side of the inner ring of the first support bearing 400 contacts the shoulder 212. A locking nut 230 is screwed and fixed to the output gear shaft 210, and the locking nut 230 contacts one side of the inner ring of the second support bearing 500. Thus, the first stop 102 and the shoulder 212 cooperate to restrict the axial position of the first support bearing 400, and the second stop 103 and the locking nut 230 cooperate to restrict the axial position of the second support bearing 500.

[0044] It should be understood that the planetary carrier 220 can be fixedly connected to the output gear shaft 210 using a spline structure. When the planetary carrier 220 rotates, it can transmit torque to the output gear shaft 210, thereby driving the output gear shaft 210 to rotate and output torque.

[0045] Please refer to Figure 2 and Figure 3 Optionally, the locking nut 230 includes a first ring body 231 and a second ring body 232, both of which are circular rings and are coaxially arranged. The outer diameter of the first ring body 231 is smaller than the outer diameter of the second ring body 232. One end of the second ring body 232 has an annular surface surrounding the first ring body 231. The annular surface is circular. At least a portion of the annular surface is configured as an axial sealing surface 233.

[0046] Please refer to Figure 6 In other embodiments, optionally, the axial unit further includes a sealing ring 240. The sealing ring 240 can be a metal ring and can be welded to the locking nut 230. For example, the sealing ring 240 is sleeved outside the first ring body 231 and contacts the annular surface. The cross-section of the sealing ring 240 is approximately T-shaped, the axial sealing surface 233 is located on the sealing ring 240, and the axial sealing lip 310 can seal with the sealing ring 240. By providing the sealing ring 240, the processing and heat treatment requirements of the locking nut 230 can be reduced, thereby reducing manufacturing costs.

[0047] In addition, the sealing ring 240 can be fixed on the planetary carrier 220. By cooperating with the skeleton oil seal 300, a sealing structure can be formed at the corresponding position on the planetary carrier 220, which improves the installation flexibility.

[0048] Please refer to Figure 5 or Figure 6 Optionally, the skeleton oil seal 300 is provided with an axial sealing lip 310 and a radial sealing lip 320. The skeleton oil seal 300 is fixed to the gearbox 100 by an axial locking member 600, and the axial sealing lip 310 can contact the axial sealing surface 233. The radial sealing lip 320 can contact the outer peripheral surface of the first ring body 231 or the outer peripheral surface of the sealing ring 240 to form a radial seal. At the same time, the radial sealing lip 320 is located on the side of the axial sealing lip 310 away from the second support bearing 500. In this way, the design of the radial sealing lip 320 can filter lubricating oil, block foreign matter such as wear debris, protect the axial sealing lip 310, and extend the service life of the axial sealing lip 310.

[0049] Furthermore, the skeleton oil seal 300 has a first chip groove 330 on the side away from the axial sealing lip 310 to reduce the probability of foreign objects entering the oil seal lip.

[0050] In addition, in some embodiments, a second chip groove 106 can be provided on the inner wall surface of the assembly through hole 101. The chip groove is designed close to the oil drain hole 105 to further reduce the risk of foreign objects entering the oil seal lip.

[0051] In this embodiment, optionally, the skeleton oil seal 300 is mounted on the gearbox 100 by an axial locking member 600. The axial locking member 600 contacts the side of the skeleton oil seal 300 away from the axial sealing lip 310 to limit the axial sealing lip 310 from moving away from the axial sealing surface 233, thereby ensuring that the axial sealing lip 310 and the axial sealing surface 233 always maintain a sealing contact and improve the sealing effect.

[0052] Optionally, the axial locking element 600 includes a threaded element 610 and an elastic element 620. The elastic element 620 is fixedly connected to the gearbox 100 via the threaded element 610, and the threaded element 610 is screwed to the third stop 104, thereby pressing the elastic element 620 onto the third stop 104. The elastic element 620 contacts the side of the skeleton oil seal 300 away from the axial sealing lip 310. By pre-tightening the skeleton oil seal 300 with the elastic force of the elastic element 620, the axial pre-tightening force can be reasonably adjusted to ensure sealing effect and reliability, and precise control of the axial pre-tightening force can also be achieved throughout its entire life cycle.

[0053] It should be noted that the elastic element 620 can be set as an elastic washer or a spring, etc.

[0054] In this embodiment, the rotary sealing structure, after assembly, has both the first support bearing 400 and the second support bearing 500 located on the side of the skeleton oil seal 300 closer to the output end 211. The magnetic drain plug 700 is located on the side of the skeleton oil seal 300 away from the second support bearing 500. There is no need to reserve installation positions for the skeleton oil seal 300 and the magnetic drain plug 700 between the first support bearing 400 and the second support bearing 500, shortening the distance between them, reducing the axial dimension of the entire output structure, reducing overall weight, and lowering manufacturing costs. The skeleton oil seal 300 has an axial sealing lip 310 and a radial sealing lip 320. The radial sealing lip 320 can block oil and wear debris, preventing them from accumulating below the second support bearing 500 and thus reducing the risk of damage. This extends the service life of the second support bearing 500. Furthermore, the axial sealing lip 310 is less susceptible to radial deviation, resulting in a good sealing effect.

[0055] 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 rotary sealing structure, characterized in that, include: The gearbox (100), output unit (200), skeleton oil seal (300), and two support bearings are provided. The output unit (200) is rotatably mounted in the gearbox (100) via the two support bearings. The output unit (200) has an output end (211) and an axial sealing surface (233). The skeleton oil seal (300) is provided with an axial sealing lip (310). The skeleton oil seal (300) is mounted on the output unit (200). The two support bearings are located on the side of the skeleton oil seal (300) closer to the output end (211). The axial sealing surface (233) and the axial sealing lip (310) are in sealed contact under the action of a preload force along the axial direction of the output unit (200).

2. The rotary sealing structure according to claim 1, characterized in that: The output unit (200) includes an output gear shaft (210), a planetary carrier (220), and a locking nut (230); the output gear shaft (210) is rotatably connected to the gearbox (100) via the two support bearings; the planetary carrier (220) and the locking nut (230) are both fixedly connected to the output gear shaft (210), and the locking nut (230) is located between the planetary carrier (220) and the support bearings; The skeleton oil seal (300) is installed on the planetary carrier (220) or the locking nut (230).

3. The rotary sealing structure according to claim 2, characterized in that: The locking nut (230) includes an integral first ring body (231) and a second ring body (232), the outer diameter of the first ring body (231) is smaller than the outer diameter of the second ring body (232), and one end of the second ring body (232) has an annular surface surrounding the first ring body (231); at least a portion of the annular surface is configured as the axial sealing surface (233).

4. The rotary sealing structure according to claim 1, characterized in that: The rotary seal structure further includes an axial locking member (600) connected to the gearbox (100). The axial locking member (600) contacts the side of the skeleton oil seal (300) away from the axial sealing lip (310) to limit the axial sealing lip (310) from moving away from the axial sealing surface (233).

5. The rotary sealing structure according to claim 4, characterized in that: The axial locking member (600) includes a threaded member (610) and an elastic member (620). The elastic member (620) is fixedly connected to the gearbox (100) through the threaded member (610). The elastic member (620) contacts the side of the skeleton oil seal (300) away from the axial sealing lip (310).

6. The rotary sealing structure according to claim 5, characterized in that: The elastic element (620) is configured as an elastic washer or a spring.

7. The rotary sealing structure according to claim 2, characterized in that: The output unit (200) includes a sealing ring (240), the axial sealing surface (233) is disposed on the sealing ring (240), and the sealing ring (240) is fixedly connected to the planetary carrier (220) or the locking nut (230).

8. The rotary sealing structure according to any one of claims 1-7, characterized in that: The skeleton oil seal (300) is also provided with a radial sealing lip (320), which is located on the side of the axial sealing lip (310) away from the support bearing; the radial sealing lip (320) is in sealing fit with the output unit (200).

9. The rotary sealing structure according to any one of claims 1-7, characterized in that: The rotary seal structure also includes a magnetic drain plug (700), which is connected to the gearbox (100) and is located on the side of the skeleton oil seal (300) away from the support bearing.

10. The rotary sealing structure according to any one of claims 1-7, characterized in that: The gearbox (100) and / or the skeleton oil seal (300) are both provided with chip grooves, which are located on the side of the support bearing away from the output end (211).

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