Gearbox sealing structure
By combining a ring-shaped support frame and an elastic seal, the wear and abnormal noise problems caused by assembly errors and output shaft deformation of the gearbox metal sealing ring are solved, providing a stable seal, extending service life and facilitating maintenance.
Patent Information
- Application Number
- CN202520674019.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-10
- Publication Date
- 2025-12-26
- Estimated Expiration
- 2035-04-10
AI Technical Summary
Existing gearbox metal sealing rings suffer from accelerated wear due to assembly errors and output shaft deformation, resulting in a short service life and a tendency to produce abnormal noises, and are not easily replaceable.
The gearbox sealing structure, through the combination of an annular support frame and elastic seals, provides support and sealing functions. The elastic seals can deform to compensate for assembly errors, reduce wear and extend service life, and are easy to maintain.
This reduces the impact of errors during assembly, improves sealing performance, extends service life, reduces abnormal noise, and facilitates later replacement.
Smart Images
Figure CN223725359U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to gear box field, specifically, relate to a gear box sealing structure. BACKGROUND
[0002] Metal seal ring is a kind of key component for ensuring that the lubricating oil inside gear box does not leak, and prevents the entry of external contaminants. It plays a crucial role in mechanical transmission system, especially in high-speed, high-pressure and high-temperature working environment. The main function of the gear box metal seal ring is to provide reliable dynamic sealing, ensure that the lubricating oil in the gear box is kept inside, while preventing dust, moisture and other contaminants from outside entering the gear box interior. This not only helps to extend the service life of the gear box, but also improves the efficiency and reliability of mechanical system. When assembling, the metal seal ring is sleeved on the output shaft, and the end face of the metal ring seal ring is attached to the end face of the outer ring of the bearing sleeved on the output shaft.
[0003] The inventor found in the research that the prior art gear box metal seal ring has at least the following disadvantages:
[0004] The metal seal ring is installed on the output shaft and rotates with the output shaft, and the metal seal ring and the outer ring are in rigid contact, generating friction between the metal seal ring and the outer ring. Due to machining or assembly errors, the coaxiality of the metal seal ring and the outer ring is difficult to guarantee, and the output shaft is twisted and bent during operation, causing the metal seal ring to wear out when rotating relative to the outer ring, shortening the service life and producing abnormal noise. The metal seal ring is constantly deformed with the deformation of the output shaft, shortening the service life. The traditional metal seal ring cannot be maintained and replaced. UTILITY MODEL CONTENTS
[0005] The utility model aims to provide a gear box sealing structure, which can compensate for errors caused by manufacturing or assembly, thereby reducing assembly difficulty and reducing the likelihood of abnormal noise during operation. It can also offset the torsion and bending deformation of the output shaft, prolonging the service life and allowing for maintenance and replacement later.
[0006] The embodiments of the utility model can be implemented as follows:
[0007] In a first aspect, the utility model provides a gear box sealing structure, comprising a box shell, an output shaft, a support bearing, an annular support framework and an elastic sealing element, wherein:
[0008] The output shaft is rotatably mounted to the box shell, an inner ring of the support bearing is sleeved on an outer side of the output shaft, and an outer ring of the support bearing is fixed to the box shell; the annular support frame has opposite outer side edges and inner side edges, the outer side edges are connected to the box shell, and the elastic sealing member is fixed to the inner side edges and in contact with the output shaft or the inner ring.
[0009] Alternatively, the elastic sealing member is fixed to the outer side edges and in contact with the box shell, and the inner side edges are connected to the output shaft or the inner ring.
[0010] In an optional embodiment, when the elastic sealing member is mounted to the inner side edges, the annular support frame comprises a connected annular body and an annular folded edge, the annular folded edge is located at an outer edge of the annular body, and the annular folded edge cooperates with the annular body to define a positioning groove; one end of the box shell is inserted into the positioning groove, an outer peripheral surface of the box shell is in contact with an inner peripheral surface of the annular folded edge, and an end surface of the box shell connected to the outer peripheral surface is in contact with the annular body.
[0011] In an optional embodiment, the annular body is provided with an annular recess.
[0012] In an optional embodiment, the annular support frame comprises a plurality of sub-annular bodies arranged in a circle and fixedly connected to adjacent sub-annular bodies, and the elastic sealing member comprises a plurality of sub-sealing bodies, each of which is connected to a corresponding sub-annular body and fixedly connected to adjacent sub-sealing bodies.
[0013] In an optional embodiment, when the elastic sealing member is mounted to the outer side edges, the annular support frame is clamped between the inner ring and the output shaft.
[0014] In an optional embodiment, the output shaft is provided with a step having an annular limiting surface close to the inner ring; the inner ring cooperates with the annular limiting surface to clamp the annular support frame.
[0015] In an optional embodiment, the annular limiting surface is provided with a first annular positioning groove, the annular support frame is embedded in the first annular positioning groove, and the inner ring cooperates with a groove wall of the first annular positioning groove to clamp the annular support frame.
[0016] In an optional embodiment, an end surface of the box shell is provided with a second annular positioning groove having a groove side wall parallel to the end surface; the annular support frame is provided with a bent portion, the elastic sealing member is fixed to the bent portion, and the elastic sealing member is in contact with the groove side wall.
[0017] In an optional embodiment, the support skeleton has an outer side distal from the support bearing, the elastic seal covering the outer side and wrapping the outer side edge or the inner side edge.
[0018] In an optional embodiment, the elastic seal is provided with an annular sealing groove for providing space for self deformation.
[0019] The beneficial effects of the embodiments of the utility model include, for example:
[0020] In summary, the gear box sealing structure provided by the embodiments can seal the space between the box shell and the output shaft by cooperation of the annular support skeleton and the elastic seal, thereby reducing the probability of leakage of lubricating oil in the box shell. During assembly, the annular support skeleton provides support, so that the elastic seal is stable and reliable relative to the box shell and the output shaft. Meanwhile, the elastic seal has a certain deformation capacity, which can compensate for assembly error or machining error during assembly, reduce assembly difficulty, and improve assembly efficiency. The elastic seal can also realize elastic contact with the box shell, the output shaft, or the inner ring of the bearing, and the contact area can be increased after deformation, thereby improving the sealing effect. During operation of the gear box, the elastic seal moves relative to the box shell, the output shaft, or the inner ring of the bearing, which is elastic dynamic contact and is not prone to abnormal noise. Moreover, the elastic seal can offset the torsional and bending deformation of the output shaft, thereby prolonging the service life and facilitating maintenance and replacement in the later period. BRIEF DESCRIPTION OF DRAWINGS
[0021] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the utility model, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.
[0022] Figure 1 It is a schematic view of the gear box sealing structure of the embodiments of the present application.
[0023] Figure 2 It is a first deformation schematic view of the gear box sealing structure of the embodiments of the present application.
[0024] Figure 3 It is a schematic view of cooperation of the annular support skeleton and the elastic seal of the embodiments of the present application.
[0025] Figure 4 It is a partial schematic view corresponding to Figure 3 .
[0026] Figure 5Part structure schematic view of a deformation example of the annular support framework and the elastic sealing element of the embodiment of the present application;
[0027] Figure 6 Schematic view of a split annular support framework and an elastic sealing element of the embodiment of the present application;
[0028] Figure 7 Schematic view of a second deformation example of the gearbox sealing structure of the embodiment of the present application;
[0029] Figure 8 Schematic view of a third deformation example of the gearbox sealing structure of the embodiment of the present application; Figure 7 Schematic view of a fourth deformation example of the gearbox sealing structure of the embodiment of the present application;
[0030] Figure 9 Schematic view of a third deformation example of the gearbox sealing structure of the embodiment of the present application;
[0031] Figure 10 Schematic view of a fourth deformation example of the gearbox sealing structure of the embodiment of the present application.
[0032] Icon:
[0033] 100 - box shell; 101 - second annular positioning groove; 200 - output shaft; 210 - step; 211 - first annular positioning groove; 300 - support bearing; 310 - inner ring; 320 - outer ring; 400 - annular support framework; 401 - sub-annular body; 410 - inner side edge; 420 - outer side edge; 430 - annular body; 440 - annular flange; 450 - sleeve part; 500 - elastic sealing element; 501 - sub-sealing body; 510 - annular sealing groove. DETAILED DESCRIPTION
[0034] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme of the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.
[0035] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.
[0036] It should be noted that like reference numerals and letters refer to like items in the several views, and once an item is defined in one view, it need not be further defined and explained in the subsequent views.
[0037] In the description of the utility model, it needs to be explained that if the terms "upper", "lower", "inner", "outer" and the like indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, or the orientation or position relationship commonly placed when the product is used, it is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model.
[0038] In addition, if the terms "first", "second" and the like are used only to distinguish the description, and cannot be understood as indicating or implying relative importance.
[0039] It should be noted that the features in the embodiments of the utility model can be combined with each other without conflict.
[0040] In the prior art, a metal sealing ring is installed between the box shell 100 of the gear box and the output shaft, the metal sealing ring is sleeved on the outside of the output shaft and the two are in interference fit, the end face of the metal sealing ring is in rigid contact with the end face of the outer ring 320 fixed on the box shell 100, and sealing is achieved. Due to assembly or manufacturing errors, and due to the shaking of the output shaft during rotation, the end face of the metal sealing ring and the end face of the outer ring 320 cannot satisfy face-to-face contact, and after long-term operation, the wear amount is large, the service life is short, and the maintenance cost is high; and abnormal noise is easy to occur.
[0041] In view of this, the designer provides a gear box sealing structure, which is convenient to install, not easy to wear and fail, has a long service life and is not easy to produce abnormal noise.
[0042] Please refer to Figures 1-10 The embodiment provides a gear box sealing structure, which comprises a box shell 100, an output shaft 200, a support bearing 300, an annular support framework 400 and an elastic sealing element 500, wherein:
[0043] The output shaft 200 is rotatably installed on the box shell 100, the inner ring 310 of the support bearing 300 is sleeved on the outside of the output shaft 200, and the outer ring 320 of the support bearing 300 is fixed in the box shell 100; the annular support framework 400 has opposite outer side edges 420 and inner side edges 410, the outer side edges 420 are connected with the box shell 100, the elastic sealing element 500 is fixed on the inner side edges 410, and the elastic sealing element 500 is in contact with the output shaft 200 or the inner ring 310;
[0044] Alternatively, the elastic seal 500 is fixed to the outer side edge 420, and the elastic seal 500 is in contact with the box shell 100; the inner side edge 410 is connected to the output shaft 200 or the inner ring 310.
[0045] As described above, the assembly method of the gear box sealing structure provided by the embodiment is as follows:
[0046] Please refer to Figure 1 The annular support framework 400 can be sleeved on the output shaft 200 first, and then the output shaft 200 is arranged in the box shell 100; under the condition that the elastic seal 500 is fixed to the outer side edge 420 of the annular support framework 400, the annular support framework 400 can be fixed to the inner ring 310 or the output shaft 200, and correspondingly, the elastic seal 500 is in contact with the box shell 100, and the elastic seal 500 can rotate relative to the box shell 100 to realize dynamic sealing; under the condition that the elastic seal 500 is fixed to the inner side edge 410 of the annular support framework 400, the annular support framework 400 can be fixed to the box shell 100, and correspondingly, the elastic seal 500 is in contact with the inner ring 310 or the output shaft 200, and the elastic seal 500 can rotate relative to the inner ring 310 or the output shaft 200 to realize dynamic sealing.
[0047] Since the support force is provided by the annular support framework 400 and the sealing function is provided by the elastic seal 500, the support function and the sealing function are separated, and the use of the elastic seal 500 will not affect the support function of the annular support framework 400 after wearing, and the stability of the position of the elastic seal 500 can be ensured at all times. At the same time, the elastic seal 500 itself has a certain deformation ability, which can not only compensate for assembly errors or machining errors during assembly to reduce assembly difficulty and improve assembly efficiency, but also can realize elastic contact with the box shell 100, the output shaft 200 or the inner ring 310 of the bearing, and after deformation, the contact area can be increased to improve the sealing effect; during the operation of the gear box, the elastic seal moves relative to the box shell 100, the output shaft 200 or the inner ring 310 of the bearing, which is elastic dynamic contact and is not easy to produce abnormal sound.
[0048] The following embodiments illustrate the details of the gear box sealing structure of the present application by way of example.
[0049] Please refer to Figure 1 、 Figure 3 and Figure 4In one embodiment, the annular support frame 400 comprises a connected annular body 430 and an annular flange 440, which can be provided as an integral structure, under the condition that the elastic sealing member 500 is mounted to the inner side edge 410, the annular support frame 400 has high structural strength, no joint, and high sealing performance. At the same time, the annular flange 440 is located at the outer edge of the annular body 430, and the annular flange 440 cooperates with the annular body 430 to define a positioning groove, the shape of the positioning groove matches the shape of the box shell 100. When assembling, one end of the box shell 100 is inserted into the positioning groove, and the outer peripheral surface of the box shell 100 is in contact with the inner peripheral surface of the annular flange 440, and the end surface connected with the outer peripheral surface of the box shell 100 is in contact with the annular body 430. It should be understood that the annular support frame 400 and the box shell 100 can be in interference fit, and the two are relatively fixed, and no relative movement occurs at the connection position, and the sealing performance is good.
[0050] Further, in order to improve the strength of the annular support frame 400, an annular recess can be provided on the annular body 430. The annular recess can be an annular groove, and the annular recess can be coaxially provided with the annular body 430. In addition, the design of the annular recess can also adapt to the assembly of the elastic sealing member 500 and the inner ring 310 or the output shaft 200. When the annular recess is recessed away from the side of the annular flange 440, the elastic sealing member 500 is in contact with the outer peripheral surface of the output shaft 200. When the annular recess is recessed towards the side of the annular flange 440, the elastic sealing member 500 is in contact with the outer peripheral surface of the inner ring 310.
[0051] In order to facilitate positioning of the inner ring 310, a step 210 can be provided on the output shaft 200, and the elastic sealing member 500 can be in contact with the step 210.
[0052] Please refer to Figure 6 Optionally, the annular support frame 400 and the elastic sealing member 500 can be provided as a split structure, which can realize the disassembly and assembly of the annular support frame 400 and the elastic sealing member 500 without disassembling the box shell 100 and the output shaft 200 and other components. For example, the annular support frame 400 comprises a plurality of sub-annular bodies 401, the plurality of sub-annular bodies 401 are arranged in a circle, and adjacent sub-annular bodies 401 are fixedly connected. Correspondingly, the elastic sealing member 500 comprises a plurality of sub-sealing bodies 501, the number of the sub-sealing bodies 501 is the same as the number of the sub-annular bodies 401, and the plurality of sub-sealing bodies 501 are respectively and correspondingly connected with the plurality of sub-annular bodies 401, and adjacent sub-sealing bodies 501 are fixedly connected.
[0053] Specifically, the annular support framework 400 can include two sub-annular bodies 401, both of which are generally circular annular, and the two sub-annular bodies 401 form an annular structure after being butt-jointed. The two sub-annular bodies 401 can be fixed by the holding glue. When disassembly is needed, the holding glue at the connecting position can be destroyed. After replacing the new annular support framework 400, the two sub-annular bodies 401 are first clamped on the output shaft 200, and then the holding glue is used to fix the connecting position of the two sub-annular bodies 401. Similarly, the number of sub-sealing bodies 501 can be two, and each sub-sealing body 501 is fixed to the inner side edge 410 of the corresponding sub-annular body 401. When the two sub-sealing bodies 501 are butt-jointed, the butt-jointed position of the two sub-sealing bodies 501 can also be fixed by the holding glue. The plurality of sub-annular bodies 401 and the plurality of sub-sealing bodies 501 are connected by the holding glue, the fixing method is simple and reliable, and it is convenient for subsequent disassembly and replacement.
[0054] Please refer to Figure 7 In another embodiment, optionally, under the condition that the elastic sealing member 500 is installed on the outer side edge, part of the annular support framework 400 can be clamped between the inner ring 310 and the output shaft 200, and the fixing is achieved by clamping. The axial positioning effect of the annular support framework 400 and the output shaft 200 is good, and it is not easy to loosen and displace, and the service life is long. At the same time, the elastic sealing member 500 can be in contact with the outer surface of the box shell 100 perpendicular to the output shaft 200, and the sealing is achieved by axial extrusion deformation. Since the axial position of the annular support framework 400 is firm and reliable, the axial position of the elastic sealing member 500 is firm and reliable, and the sealing effect is improved.
[0055] Please refer to Figure 7 and Figure 8Optionally, in order to reduce the axial size, the first annular positioning groove 211 can be arranged on the step 210 of the output shaft 200, the inner ring 310 is in contact with the step 210, and the part of the annular support skeleton is located in the first annular positioning groove 211, and the groove wall of the inner ring 310 and the first annular positioning groove 211 clamps the annular support skeleton. In order to avoid transition positioning, the elastic sealing layer can be arranged on the outer side of the annular support skeleton 400, the inner ring 310 and the groove wall clamp the annular support skeleton 400 and the elastic sealing layer, so that the inner ring 310 can abut against the step 210 while clamping the annular support skeleton 400. It should be understood that the elastic sealing layer can be arranged in an integrated structure with the elastic sealing member 500. In this way, the elastic sealing member 500 can cover the outer side of the annular support skeleton 400, which not only avoids the transition positioning condition, but also improves the corrosion resistance of the outer side of the annular support skeleton 400. Wherein, the outer side of the annular support skeleton 400 refers to the side of the annular support skeleton 400 away from the support bearing 300, which is exposed to the external environment and is easy to be corroded. By covering the outer side with the elastic sealing member 500, the corrosion resistance of the annular support skeleton 400 is improved, and the service life is prolonged.
[0056] Please refer to Figure 9 or Figure 10 Optionally, in order to improve the space utilization efficiency inside the box shell 100, the second annular positioning groove 101 can be arranged on the end face of the box shell 100, the second annular positioning groove 101 has a groove side wall parallel to the end face; the annular support skeleton 400 is provided with a bending portion, and the elastic sealing member 500 is fixed to the bending portion, and the elastic sealing member 500 is in contact with the groove side wall. That is, the elastic sealing member 500 is axially extruded and limited by the groove side wall, thereby realizing dynamic sealing through the dynamic sealing function of the elastic sealing member 500.
[0057] Obviously, in some embodiments, the elastic sealing member 500 can be in contact with the inner circumferential surface of the box shell 100 to realize dynamic sealing.
[0058] Please refer to Figure 10 Alternatively, in some embodiments, the sleeve portion 450 can be arranged on the inner side edge 410, and the sleeve portion 450 is sleeved on the output shaft 200 or the inner ring 310, the sleeve portion 450 is in interference fit with the output shaft 200 or the inner ring, and the axial limiting is realized. Due to the increase of the axial size of the sleeve portion 450, the contact area is larger, and the combination with the output shaft 200 or the inner ring 310 is more stable and reliable.
[0059] It should be noted that in other embodiments, the elastic sealing piece 500 can also cover the outer side of the annular support framework 400, and the outer side edge 420 or the inner side edge 410 of the annular support framework 400 is wrapped by the elastic sealing piece 500, which can improve the connection strength of the elastic sealing piece 500 and the annular support framework 400, and also improve the corrosion resistance of the outer side of the annular support framework 400.
[0060] Please refer to Figure 4 Or Figure 5 In the embodiment, optionally, the elastic sealing piece 500 can be a rubber piece, the annular support framework 400 can be a metal piece, and the elastic sealing piece 500 can be heat-sealed and fixed on the annular support framework 400. The elastic sealing piece 500 can wrap the inner side edge 410 or the outer side edge 420 of the annular support framework 400, and the two form a clamping fitting structure that engages with each other, and the combination of the two is stable and reliable.
[0061] In addition, the elastic sealing piece 500 is provided with an annular sealing groove 510 for providing space for its deformation, and the side of the groove opening of the annular sealing groove 510 is in contact with the box shell 100, the inner ring 310 or the output shaft. Under extrusion, the annular sealing groove 510 deforms, increasing the area of the groove wall of the annular sealing groove 510 in contact with the box shell 100, the inner ring 310 or the output shaft, and the sealing effect is good.
[0062] The gear box sealing structure provided in the embodiment provides support through the annular support framework 400, so that the elastic sealing piece 500 is stable and reliable relative to the box shell 100 and the output shaft 200. At the same time, the elastic sealing piece 500 itself has a certain deformation ability, which can compensate for assembly errors or machining errors during assembly, reduce assembly difficulty and improve assembly efficiency; it can also realize elastic contact with the box shell 100, the output shaft 200 or the inner ring 310 of the bearing; after deformation, it can increase the contact area and improve the sealing effect; during the operation of the gear box, the elastic sealing piece moves relative to the box shell 100, the output shaft 200 or the inner ring 310 of the bearing, which is elastic dynamic contact, has a long service life and is not prone to abnormal noise.
[0063] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto. Any skilled person in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.
Claims
1. A gear box seal structure, characterized by, The gear box sealing structure comprises a box shell (100), an output shaft (200), a support bearing (300), an annular support framework (400) and an elastic sealing member (500), wherein: The output shaft (200) is rotatably mounted on the box shell (100), the inner ring (310) of the support bearing (300) is sleeved on the outer surface of the output shaft (200), and the outer ring (320) of the support bearing (300) is fixed in the box shell (100); the annular support framework (400) has opposite outer edges (420) and inner edges (410), the outer edges (420) are connected with the box shell (100), and the elastic sealing member (500) is fixed on the inner edges (410) and in contact with the output shaft (200) or the inner ring (310); Alternatively, the elastic sealing member (500) is fixed on the outer edges (420) and in contact with the box shell (100), and the inner edges (410) are connected with the output shaft (200) or the inner ring (310).
2. The gear box sealing structure according to claim 1, wherein: When the elastic sealing member (500) is mounted on the inner edges (410), the annular support framework (400) comprises an annular body (430) and an annular flange (440) connected with each other, the annular flange (440) is located at the outer edge of the annular body (430), and the annular flange (440) cooperates with the annular body (430) to define a positioning groove; one end of the box shell (100) is inserted into the positioning groove, the outer circumferential surface of the box shell (100) is in contact with the inner circumferential surface of the annular flange (440), and the end surface of the box shell (100) connected with the outer circumferential surface is in contact with the annular body (430).
3. The gear box sealing structure according to claim 2, wherein: The annular body (430) is provided with an annular recess.
4. The gear box sealing structure according to claim 2, wherein: The annular support framework (400) comprises a plurality of sub-annular bodies (401) arranged in a circle and fixedly connected with each other, and the elastic sealing member (500) comprises a plurality of sub-sealing bodies (501) connected with the plurality of sub-annular bodies (401) one by one and fixedly connected with each other.
5. The gear box sealing structure according to claim 1, wherein: When the elastic sealing member (500) is mounted on the outer edges, the annular support framework (400) is clamped between the inner ring (310) and the output shaft (200).
6. The gear box sealing structure according to claim 5, wherein: The output shaft (200) is provided with a step (210) having an annular limiting surface close to the inner ring (310); the inner ring (310) and the annular limiting surface cooperate to clamp the annular support framework (400).
7. The gear box sealing structure according to claim 6, characterized in that: The annular limiting surface is provided with a first annular positioning groove (211), and the annular support framework (400) is embedded in the first annular positioning groove (211); the inner ring (310) and the groove wall of the first annular positioning groove (211) cooperate to clamp the annular support framework (400).
8. The gear box sealing structure according to claim 5, characterized in that: The end surface of the box shell (100) is provided with a second annular positioning groove (101) having a groove side wall parallel to the end surface; the annular support framework (400) is provided with a bent portion, and the elastic sealing member (500) is fixed to the bent portion; the elastic sealing member (500) is in contact with the groove side wall.
9. The gear box sealing structure according to any one of claims 1-8, characterized in that: The support framework has an outer side surface away from the support bearing (300), and the elastic sealing member (500) covers the outer side surface and wraps the outer side edge (420) or the inner side edge (410).
10. The gear box sealing structure according to any one of claims 1-8, characterized in that: The elastic sealing member (500) is provided with an annular sealing groove (510) for providing space for self-deformation.