Maintenance-free intermediate support assembly and propeller shaft system

Abstract

The application relates to a maintenance-free intermediate support assembly and a transmission shaft system. The maintenance-free intermediate support assembly comprises a total cost body, a support bearing arranged in the total cost body and formed with a first containing groove on the outer surface of one side along the axial direction of the support bearing, the first containing groove being at least opened on the end surface of the support bearing along the axial direction, an observation disc arranged in the first containing groove and used for observing the internal structure of the support bearing, a first oil seal structure arranged in the first containing groove and used for sealing one end surface of the support bearing, and a second oil seal structure arranged on the other end surface of the support bearing and used for sealing the support bearing. The internal structure of the support bearing is checked in real time through the observation disc, the quality state of the support bearing can be monitored at any time, the failure part of the support bearing can be maintained and treated in time if problems are found, major quality problems of the support bearing are reduced, the safety and service life of the vehicle are improved, and the probability of causing great loss to the whole vehicle is reduced.

Description

Technical Field

[0001] This application relates to the field of intermediate support technology for drive shafts, and in particular to maintenance-free intermediate support assemblies and drive shaft systems. Background Technology

[0002] With the development of automotive technology and the improvement of living standards, commercial vehicles are getting bigger and bigger, and the wheelbase of the vehicles is increasing accordingly. In order to avoid the problem of resonance caused by the low critical speed due to the excessive length of a single driveshaft assembly, it is necessary to fix two or more assemblies in the driveshaft system to the frame through an intermediate support assembly.

[0003] In existing technology, the intermediate support assembly mainly consists of bearing components, rubber washer ring components, washer ring bracket components, and other fasteners from the inside out. The bearing components need to be lubricated with grease in a timely manner to prevent excessive friction caused by excessive speed, which could lead to transmission shaft failure. Currently, there are two types of lubrication schemes for bearing components: one is maintenance type, where the bearing components are not completely sealed and grease is added periodically according to mileage. However, in this lubrication scheme, the bearing components cannot be completely isolated from the intrusion of dust, oil, water stains, and other substances. The introduction of impurities increases the friction of the bearing components, affecting bearing lubrication and lifespan, and easily causing intermediate support failure. Secondly, there are maintenance-free types, such as patents CN106541825A, CN205800796U, and CN211574053U. These designs integrate the bearing components with the oil seal, ensuring the sealing of the bearing and reducing the frequency of grease application or eliminating the need for regular grease application. However, because the bearing components are completely sealed, the internal quality of the intermediate support assembly cannot be determined from the outside. If early failure occurs, it cannot be identified. When the driveshaft has already suffered a serious failure, it is often necessary to replace the entire driveshaft assembly or other related parts, which greatly increases the overall vehicle maintenance cost. Summary of the Invention

[0004] Therefore, it is necessary to provide a maintenance-free intermediate support assembly and drive shaft system to address the above problems.

[0005] In a first aspect, embodiments of this application provide a maintenance-free intermediate support assembly, comprising:

[0006] Total cost body;

[0007] A support bearing is disposed within the total cost body, and a first receiving groove is formed on one outer surface along its axial direction. The first receiving groove opens at least at the end face of the support bearing along its axial direction.

[0008] An observation plate is set in the first receiving groove for observing the internal structure of the support bearing;

[0009] A first oil seal structure is disposed in the first receiving groove and is used to seal one end face of the support bearing;

[0010] The second oil seal structure is located on the other end face of the support bearing and is used to seal the support bearing.

[0011] In the aforementioned maintenance-free intermediate support assembly, the drive shaft of the drive shaft system is connected via a support bearing. The support bearing is sealed by a first oil seal structure and a second oil seal structure, allowing grease to be contained within it, thus achieving a maintenance-free design. An observation disc is installed in the first accommodating groove on one side of the support bearing, enabling real-time inspection of the internal structure. This facilitates continuous monitoring of the support bearing's quality status. If problems are detected, faulty components can be repaired and addressed promptly, reducing the likelihood of major quality issues, improving vehicle safety and lifespan, and minimizing the chance of significant damage to the entire vehicle.

[0012] In one embodiment, the support bearing includes an inner bearing ring, rollers, and an outer bearing ring arranged sequentially from the inside to the outside, wherein:

[0013] A notch is formed on one side of the outer surface of the inner ring of the bearing along its axial direction, and the notch mates with the outer ring of the bearing to form the first receiving groove;

[0014] The second oil seal structure is located on the side of the bearing inner ring away from the first receiving groove, and is inserted into the gap between the bearing inner ring and the bearing outer ring.

[0015] In one embodiment, along the axial direction of the support bearing, the end face of the outer ring of the bearing is flush with the end face of the notch to form a stepped first receiving groove.

[0016] In one embodiment, the first oil seal structure is disposed between the surfaces of the observation disc and the inner ring of the bearing; along the axial direction of the support bearing, the orthographic projection of the observation disc on the support bearing at least covers a portion of the gap between the inner ring and the outer ring of the bearing.

[0017] In one embodiment, an anaerobic sealant is applied between the mating surfaces of the observation disc and the outer ring of the bearing.

[0018] In one embodiment, the observation disc is made of a transparent material.

[0019] In one embodiment, the overall structure includes a frame assembly, a bearing housing, and two resilient retaining rings, wherein:

[0020] The frame assembly is a cavity structure with openings at both ends;

[0021] The bearing housing is disposed within the frame assembly for accommodating the support bearing, and the bearing housing has slots on both sides of the support bearing along its axial direction.

[0022] The elastic retaining ring is disposed in the slot and is used to position the support bearing and the observation plate.

[0023] In one embodiment, the gap between the slot and the support bearing, and the observation disc in the axial direction of the support bearing, is 0.1mm-0.2mm.

[0024] In one embodiment, the frame assembly includes an upper mounting bracket, a lower mounting bracket, and a rubber gasket ring, wherein:

[0025] The rubber gasket ring is disposed between the upper mounting bracket and the lower mounting bracket, and is fixed together with the upper mounting bracket and the lower mounting bracket;

[0026] The bearing housing is disposed inside the rubber gasket ring and is vulcanized integrally with the rubber gasket ring.

[0027] Secondly, embodiments of this application provide a drive shaft system, including:

[0028] A drive shaft includes a shaft body and a flange, wherein the flange is sleeved on the shaft body and cooperates with the shaft body to form a second receiving groove;

[0029] As described in any of the above embodiments, the maintenance-free intermediate support assembly is sleeved on the drive shaft, and the support bearing and the second oil seal structure are fixed in the second receiving groove.

[0030] In the aforementioned maintenance-free intermediate support assembly, the assembly is mounted on the drive shaft. The support bearing and the second oil seal structure are fixed within the second receiving groove formed by the flange and shaft body of the drive shaft. The drive shaft is connected via the support bearing, and the end face of the support bearing is sealed by the first and second oil seal structures, allowing grease to be contained within the support bearing, thus achieving maintenance-free operation. An observation disc is installed in the first receiving groove on one side of the support bearing, enabling real-time inspection of the internal structure of the support bearing. This facilitates continuous monitoring of the support bearing's quality status. If problems are detected, faulty components can be repaired and addressed promptly, reducing the likelihood of major quality issues, improving vehicle safety and service life, and minimizing the chance of significant damage to the entire vehicle. Therefore, the drive shaft system with this maintenance-free intermediate support assembly allows for timely maintenance, high reliability, and a long service life. Attached Figure Description

[0031] Figure 1 This is a front view of a maintenance-free intermediate support assembly provided in an embodiment of this application.

[0032] Figure 2 for Figure 1 Cross-sectional view of the maintenance-free intermediate support assembly at position AA.

[0033] Figure 3 This is a cross-sectional view of the support bearing in a maintenance-free intermediate support assembly provided in an embodiment of this application.

[0034] Figure 4 This is a front view of the drive shaft system provided in the first embodiment of this application.

[0035] Figure 5 for Figure 4 A cross-sectional view of the central drive shaft system at position BB.

[0036] Figure label:

[0037] 01. Drive shaft system;

[0038] 10. Maintenance-free intermediate support assembly;

[0039] 100. Overall structural member; 110. Frame assembly; 111. Upper mounting bracket; 112. Lower mounting bracket; 113. Rubber washer ring; 120. Bearing housing; 121. Slot; 130. Elastic retaining ring;

[0040] 200, Support bearing; 210, First receiving groove; 220, Inner ring of bearing; 221, Notch; 230, Roller; 240, Outer ring of bearing; 250, Protective frame;

[0041] 300. Observation panel;

[0042] 400. First oil seal structure;

[0043] 500. Second oil seal structure;

[0044] 20. Drive shaft; 21. Shaft body; 22. Flange; 23. Second receiving groove. Detailed Implementation

[0045] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0046] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application 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 application.

[0047] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0048] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0049] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0050] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0051] like Figure 1 as well as Figure 2 As shown, in a first aspect, embodiments of this application provide a maintenance-free intermediate support assembly 10, including a main body 100, a support bearing 200, an observation panel 300, a first oil seal structure 400, and a second oil seal structure 500. This maintenance-free intermediate support assembly 10, while fulfilling the functions of transmission connection and maintenance-free operation, allows for inspection of the internal structure of the support bearing 200 by providing an observation panel 300 on one side.

[0052] In the maintenance-free intermediate support assembly 10, a support bearing 200 is disposed within the main body 100, and a first receiving groove 210 is formed on one outer surface of the support bearing 200 along its axial direction. The first receiving groove 210 opens at least into the end face of the support bearing 200 along its axial direction. An observation disc 300 is disposed within the first receiving groove 210 and is used to observe the internal structure of the support bearing 200. A first oil seal structure 400 is disposed within the first receiving groove 210 and is used to seal one end face of the support bearing 200. A second oil seal structure 500 is disposed on the other end face of the support bearing 200, and the first oil seal structure 400 is used to seal the support bearing 200.

[0053] In the aforementioned maintenance-free intermediate support assembly 10, the drive shaft 20 of the drive shaft system 01 is connected via a support bearing 200, and the support bearing 200 is sealed by a first oil seal structure 400 and a second oil seal structure 500, allowing grease to be contained within the support bearing 200, thus achieving a maintenance-free configuration. An observation disc 300 is installed in the first receiving groove 210 on one side of the support bearing 200, enabling real-time inspection of the internal structure of the support bearing 200. This facilitates continuous monitoring of the support bearing 200's quality status, allowing for timely repair and handling of any faulty components if problems are detected. This reduces the likelihood of major quality issues with the support bearing 200, improves vehicle safety and service life, and minimizes the chance of significant damage to the entire vehicle.

[0054] In this embodiment, the total cost body 100 can still adopt the structure of the total cost body 100 in the prior art, so as to reduce costs and improve the generalization rate. Of course, in order to facilitate the adaptation to different maintenance-free intermediate support assemblies 10, a modular design can also be carried out based on the existing total cost body 100 structure.

[0055] like Figure 1 , Figure 2 as well as Figure 3 As shown, in one embodiment, the overall structure 100 includes a frame assembly 110, a bearing housing 120, and two elastic retaining rings 130. The frame assembly 110 is a cavity structure open at both ends. The bearing housing 120 is disposed within the frame assembly 110 and is used to accommodate a support bearing 200. The bearing housing 120 has slots 121 on both sides of the support bearing 200 along its axial direction. The elastic retaining rings 130 are disposed within the slots 121 and are used to position the support bearing 200 and the observation plate 300. Thus, by sequentially arranging the bearing housing 120 and the support bearing 200 within the frame assembly 110, and placing the observation plate 300 after the first receiving slot 210, the elastic retaining rings 130 facilitate the convenient assembly and positioning of the overall structure 100 with the support bearing 200 and the observation plate 300.

[0056] like Figure 2 as well as Figure 3 As shown, in one embodiment, the gap between the slot 121 and the support bearing 200 and the observation plate 300 in the axial direction of the support bearing 200 can be 0.1mm-0.2mm, taking into account the dimensional chain relationship, to facilitate the setting of the elastic retaining ring 130. Specifically, the gap between the slot 121 and the support bearing 200 and the observation plate 300 in the axial direction of the support bearing 200 can be 0.1mm, 0.11mm, 0.12mm, 0.13mm, 0.14mm, 0.15mm, 0.16mm, 0.17mm, 0.18mm, 0.19mm, or 0.2mm. Of course, the gap between the slot 121 and the support bearing 200 and the observation plate 300 in the axial direction of the support bearing 200 is not limited to the above values ​​and can also be other values ​​within the range of 0.1mm-0.2mm.

[0057] like Figure 1 as well as Figure 2As shown, in one embodiment, the frame assembly 110 includes an upper mounting bracket 111, a lower mounting bracket 112, and a rubber gasket 113. The rubber gasket 113 is disposed between the upper mounting bracket 111 and the lower mounting bracket 112, and is fixed integrally with the upper mounting bracket 111 and the lower mounting bracket 112 by bolts, screws, or other structural means to form a sealed frame assembly 110. A bearing housing 120 is disposed within the rubber gasket 113, and the bearing housing 120 and the rubber gasket 113 are vulcanized together, so that the bearing housing 120 and the rubber gasket 113 form a tightly integrated sub-assembly. In specific configuration, the rubber gasket 113 adopts a special arc-shaped structure and connecting column. The arc-shaped structure and connecting column cooperate with the upper mounting bracket 111 and the lower mounting bracket 112. During assembly, the upper mounting bracket 111, the lower mounting bracket 112 and the rubber gasket 113 are combined. Through the bolt holes reserved on the upper mounting bracket 111, bolts are installed into the upper mounting bracket 111, the lower mounting bracket 112, the gasket and other structures.

[0058] like Figure 2 as well as Figure 3 As shown, in one embodiment, the support bearing 200 includes an inner bearing ring 220, rollers 230, and an outer bearing ring 240, arranged sequentially from the inside to the outside. Specifically, a notch 221 is formed on one outer surface of the inner bearing ring 220 along its axial direction. The notch 221 mates with the outer bearing ring 240 to form a first receiving groove 210. At this time, an observation disc 300 can be inserted from one side of the main body 100 between the inner bearing ring 220 and the outer bearing ring 240 to facilitate the placement of the observation disc 300. A second oil seal structure 500 is located on the side of the inner bearing ring 220 away from the first receiving groove 210, and the second oil seal structure 500 is inserted into the gap between the inner bearing ring 220 and the outer bearing ring 240 to facilitate the placement of the second oil seal structure 500. In a specific configuration, the support bearing 200 also includes a protective frame 250, which is positioned between the inner bearing ring 220 and the outer bearing ring 240, and is fitted over the outer side of the roller 230 to protect the roller 230. The inner bearing ring 220, roller 230, protective frame 250, and outer bearing ring 240 form a sub-assembly as a module. During assembly, after the outer bearing ring 240 is fixed to the bearing housing 120 of the main body 100, the support bearing 200 as a whole is fixed to the bearing housing 120.

[0059] like Figure 2 as well as Figure 3As shown, in one embodiment, along the axial direction of the support bearing 200, the end face of the bearing outer ring 240 is flush with the end face of the notch 221 to form a stepped first receiving groove 210. At this time, the stepped first receiving groove 210 cooperates with the inner wall of the main body 100 to form a receiving space, which is used to receive the observation plate 300 to facilitate the setting of the observation plate 300.

[0060] like Figure 2 as well as Figure 3 As shown, in one embodiment, a first oil seal structure 400 is disposed between the opposing surfaces of the observation plate 300 and the bearing inner ring 220. One end of the first oil seal structure 400 is fixed to the bearing inner ring 220, and the other end is fixed to the observation plate 300, in order to ensure a sealing relationship between the bearing inner ring 220 and the observation plate 300. At this time, the first oil seal structure 400 is in a sealed connection with the bearing inner ring 220 and the bearing outer ring 240 to achieve a sealed environment inside the support bearing 200, thereby achieving maintenance-free operation of the support bearing 200.

[0061] Along the axial direction of the support bearing 200, the orthographic projection of the observation disc 300 onto the support bearing 200 covers at least a portion of the gap between the inner ring 220 and the outer ring 240 of the bearing. This allows the observation disc 300 to observe the specific conditions within the gap between the inner ring 220 and the outer ring 240, such as the internal structural operating state of the bearing rollers 230, the inner ring 220, and the outer ring 240, as well as the content and condition of the lubricating grease. These observations help determine the specific condition of the support bearing 200. In a specific configuration, the orthographic projection of the observation disc 300 onto the support bearing 200 can cover a portion of the gap between the inner ring 220 and the outer ring 240, allowing for a wider range of observation by adjusting the viewing angle; or the orthographic projection of the observation disc 300 onto the support bearing 200 can cover the entire gap between the inner ring 220 and the outer ring 240, facilitating a more convenient and extensive observation.

[0062] It should be noted that the support bearing 200 with the observation plate 300 can be interchanged left and right. With complete universality, the support bearing 200 can be rotated 180° along its axis to achieve a visual perspective function with two angles: looking backward from the front side and looking forward from the rear side.

[0063] In one embodiment, an anaerobic sealant is applied between the mating surfaces of the observation disc 300 and the bearing outer ring 240 to prevent the seal from being compromised and to isolate the surface from dust, oil, water, and other contaminants. Of course, to further improve the sealing effect, anaerobic sealant can also be applied to all the aforementioned mating surfaces for sealing and fixation.

[0064] In one embodiment, the observation disc 300 is made of a transparent material so that the internal structure of the support bearing 200 can be clearly and reliably observed through the observation disc 300, facilitating timely inspection. Specifically, the transparent material can be a transparent or semi-transparent material; more specifically, it can be a synthetic resin with advantages such as good light transmittance, high strength, and high wear resistance.

[0065] like Figure 4 as well as Figure 5 As shown, in a second aspect, embodiments of this application provide a driveshaft system 01 for realizing the transmission of a long-wheelbase commercial vehicle. The driveshaft system 01 includes a driveshaft 20 and a maintenance-free intermediate support assembly 10 as described in any of the above embodiments, wherein: the driveshaft 20 includes a shaft body 21 and a flange 22, the flange 22 being sleeved on the shaft body 21, and the flange 22 and the shaft body 21 cooperating to form a second receiving groove 23. In a specific configuration, a groove is formed on the shaft body 21, the flange 22 is sleeved on the shaft body 21, and the end of the flange 22 cooperates with the groove of the shaft body 21 to form the second receiving groove 23.

[0066] The maintenance-free intermediate support assembly 10 is mounted on the drive shaft 20, and within the maintenance-free intermediate support assembly 10, the support bearing 200 and the second oil seal structure 500 are fixed within the second receiving groove 23. In specific installation, after the support bearing 200 and the second oil seal structure 500 are placed within the second receiving groove 23, the shaft body 21 and the flange 22 are locked and fixed by a locking nut to achieve the assembly of the drive shaft system 01.

[0067] In the aforementioned maintenance-free intermediate support assembly 10, the maintenance-free intermediate support assembly 10 is sleeved on the drive shaft 20. The support bearing 200 and the second oil seal structure 500 are fixed in the second receiving groove 23 formed by the flange 22 and the shaft body 21 of the drive shaft 20, so as to connect the drive shaft 20 through the support bearing 200. The end face of the support bearing 200 is sealed by the first oil seal structure 400 and the second oil seal structure 500, so that grease can be contained in the support bearing 200, realizing the maintenance-free setting of the support bearing 200. By setting an observation plate 300 in the first receiving groove 210 on one side of the support bearing 200, the internal structure of the support bearing 200 can be inspected in real time through the observation plate 300, which facilitates the monitoring of the quality status of the support bearing 200 at any time. If a problem is found, the failure of the support bearing 200 can be repaired and dealt with in time, reducing the occurrence of major quality problems of the support bearing 200, improving the safety and service life of the vehicle, and reducing the probability of causing significant damage to the whole vehicle. Therefore, the drive shaft system 01 with this maintenance-free intermediate support assembly 10 can be repaired in a timely manner, has high reliability and a long service life.

[0068] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0069] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A maintenance-free intermediate support assembly, characterized in that, include: The total cost body includes a bearing housing and two elastic retaining rings; A support bearing is disposed within the bearing housing of the main body. The support bearing includes an inner bearing ring, rollers, and an outer bearing ring arranged sequentially from the inside to the outside. A notch is formed on one outer surface of the inner bearing ring along its axial direction. Along the axial direction of the support bearing, the end face of the outer bearing ring is flush with the end face of the notch. The notch and the outer bearing ring mate to form a first receiving groove. The first receiving groove has a stepped structure, which opens toward the inner wall of the main body and at least at the end face of the support bearing along its axial direction. An observation disc, made of a transparent or semi-transparent structure of synthetic resin, is embedded in the first receiving groove and cooperates with the inner wall of the bearing housing to form a closed receiving space. The orthogonal projection of the observation disc on the support bearing covers at least part of the gap between the inner ring and the outer ring of the bearing, for observing the internal structure of the support bearing. The observation disc is interchangeable with the support bearing by 180° rotation to achieve bidirectional visualization. The mating surface between the observation disc and the outer ring of the bearing is coated with anaerobic sealant. The first oil seal structure is disposed in the first receiving groove and sandwiched between the observation plate and the opposing surfaces of the bearing inner ring, for sealing one end face of the support bearing; The second oil seal structure is inserted into the radial gap between the inner ring and the outer ring of the bearing at the other end face of the support bearing away from the first receiving groove, and is used to seal the other end face of the support bearing. The bearing housing has slots on both sides of the supporting bearing along its axial direction. The elastic retaining ring is disposed in the slot and simultaneously provides axial positioning for the supporting bearing and the observation plate. The gap between the slot and the supporting bearing and the observation plate in the axial direction of the supporting bearing is 0.1mm-0.2mm.

2. The maintenance-free intermediate support assembly according to claim 1, characterized in that, The overall structure includes a frame assembly, which is a cavity structure with openings at both ends; The bearing housing is disposed within the frame assembly for accommodating the support bearing.

3. The maintenance-free intermediate support assembly according to claim 2, characterized in that, The frame assembly includes an upper mounting bracket, a lower mounting bracket, and a rubber gasket ring, wherein: The rubber gasket ring is disposed between the upper mounting bracket and the lower mounting bracket, and is fixed together with the upper mounting bracket and the lower mounting bracket; The bearing housing is disposed inside the rubber gasket ring and is vulcanized integrally with the rubber gasket ring.

4. The maintenance-free intermediate support assembly according to claim 3, characterized in that, The rubber pad ring is provided with an arc-shaped structure and a connecting post, which are configured to cooperate with the upper mounting bracket and the lower mounting bracket.

5. The maintenance-free intermediate support assembly according to claim 1, characterized in that, The support bearing also includes a protective frame, which is disposed between the inner ring and the outer ring of the bearing and sleeved on the outside of the roller to protect the roller.

6. The maintenance-free intermediate support assembly according to claim 1, characterized in that, Along the axial direction of the support bearing, the orthographic projection of the observation disc onto the support bearing covers the entire gap between the inner and outer rings of the bearing.

7. The maintenance-free intermediate support assembly according to claim 1, characterized in that, One end of the first oil seal structure is fixed to the inner ring of the bearing, and the other end is fixed to the observation plate.

8. A drive shaft system, characterized in that, include: A drive shaft includes a shaft body and a flange, wherein the flange is sleeved on the shaft body and cooperates with the shaft body to form a second receiving groove; The maintenance-free intermediate support assembly as described in any one of claims 1-7, wherein the maintenance-free intermediate support assembly is sleeved on the drive shaft, and the support bearing and the second oil seal structure are fixed in the second receiving groove.

9. The drive shaft system according to claim 8, characterized in that, After the support bearing and the second oil seal structure are fixed in the second accommodating groove, the shaft body and the flange are locked and fixed by a lock nut.

10. The drive shaft system according to claim 8, characterized in that, The support bearing contains grease, and the first oil seal structure and the second oil seal structure seal both ends of the support bearing to seal the grease, thereby achieving a maintenance-free setting for the support bearing.

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