Universal wheel assembly and mobile equipment

Abstract

The utility model relates to the technical field of universal wheels, and provides a universal wheel assembly and mobile device.The universal wheel assembly comprises a rolling wheel body with an axial through bearing cavity, a fixing base and a fixing wheel shaft, a rolling bearing is arranged in the bearing cavity, and the rolling wheel body is provided with a first assembling wall; the fixing seat comprises a first ring wall, an assembling gap is reserved between the first ring wall and the first assembling wall, and a first sealing piece for sealing one end of the bearing cavity is further arranged on the fixing seat; the fixed wheel shaft is suitable for penetrating through the fixed seat, the end of the bearing cavity and the rolling bearing. The mobile device comprises a universal wheel assembly and a device body. The first sealing piece is relatively located on the outer side of the bearing cavity, the first sealing piece and the rolling bearing are located on the fixing base and the roller body correspondingly, and the assembling gap is further formed between the first annular wall and the first assembling wall; it can be guaranteed that the sealing effect of the first sealing piece is not affected by the coaxiality error of the fixed wheel shaft, the rolling bearing and the first sealing piece, and the first sealing piece is prevented from being clamped in a bearing cavity.

Description

TECHNICAL FIELD

[0001] The utility model relates to a universal wheel technical field further relates to a universal wheel assembly and mobile device. BACKGROUND

[0002] Most of the existing outdoor mobile robots use a rolling wheel mechanism as a driven wheel, and the intelligent mowing robot product is widely used. The water content of the outdoor lawn is relatively high, and the water content of the mowed grass clippings is also high. The low-lying water pits on the lawn are common working condition scenes. If the rolling wheel mechanism is not sealed, the rolling bearing of the rolling wheel mechanism is easily in contact with water and dust for a long time, which causes the rolling bearing to rust. The phenomenon of rotating jam often occurs, which further causes the entire intelligent mowing robot to be unable to work normally due to the unsmooth rotation of the rolling wheel mechanism. The existing technology improves the waterproof rust resistance of the rolling bearing, which results in a higher cost of the rolling bearing and cannot fundamentally solve the problem of rust and jam of the rolling bearing. It only delays the occurrence of this situation. There is also a technology that provides a sealing structure inside the rolling wheel mechanism. At this time, the wheel shaft, the rolling bearing, and the sealing structure are arranged on the inner side of the rolling wheel mechanism and need to be kept on the same axis. However, the coaxiality of the wheel shaft, the rolling bearing, and the sealing structure is difficult to guarantee, especially during the operation of the rolling wheel mechanism. The wheel shaft, the rolling bearing, and the sealing structure are prone to misalignment, which causes the rolling wheel mechanism to jam and rotate smoothly. Moreover, the stress deflection of the sealing structure also affects the sealing effect. SUMMARY

[0003] In view of the above technical problems, the utility model aims to provide a universal wheel assembly and mobile device. The fixing seat buckle is fixed to one end of the rolling wheel body. The first sealing element is arranged on the fixing seat and is suitable for sealing one end of the bearing cavity, so that the rolling wheel body achieves the effect of dust and water prevention, can adapt to various complex working conditions, and improves the service life. Moreover, the first sealing element is located on the outside of the bearing cavity. The first sealing element and the rolling bearing are respectively located on the fixing seat and the rolling wheel body. The assembly gap is further arranged between the first ring wall and the first assembly wall, which can ensure that the coaxiality error of the fixing wheel shaft, the rolling bearing, and the first sealing element does not affect the sealing effect of the first sealing element, and avoids the first sealing element from being stuck in the bearing cavity.

[0004] In order to achieve the above-mentioned purpose, the utility model provides a universal wheel assembly, which comprises a rolling wheel body, a fixing seat, and a fixing wheel shaft. The rolling wheel body has an axially through bearing cavity. A plurality of rolling bearings are arranged in the bearing cavity. The rolling wheel body further comprises a first assembly wall on the outside of one end of the bearing cavity.

[0005] The fixed seat comprises a first ring wall adapted to be arranged inside the first assembly wall and leaving an assembly gap between the outer circle of the first ring wall and the inner wall of the first assembly wall, and a first sealing member arranged on the fixed seat and adapted to be sealingly arranged at one end of the bearing cavity;

[0006] The fixed axle is adapted to pass through the fixed seat, one end of the bearing cavity and the rolling bearing to the other end of the bearing cavity.

[0007] In some embodiments, the outer circle of the first ring wall is further provided with a first clamping block, the inner wall of the first assembly wall is further provided with a second clamping block, the first clamping block is adapted to abut and fix with the second clamping block, so that the fixed seat is snap-fitted to the rolling body.

[0008] In some embodiments, the fixed seat further comprises a second ring wall located opposite to the first ring wall, the inner side of the second ring wall is provided with a first clamping groove, and the first sealing member is arranged in the first clamping groove.

[0009] In some embodiments, the rolling body is further provided with a second assembly wall at one end of the bearing cavity, the second assembly wall is located opposite to the first assembly wall, and an assembly groove is arranged between the first assembly wall and the second assembly wall, and the first ring wall is adapted to abut and fit into the assembly groove;

[0010] A second clamping groove is formed between the second ring wall and the first ring wall, and the second assembly wall is adapted to abut and fit into the second clamping groove.

[0011] In some embodiments, the second assembly wall is flush with the inner wall of the end of the bearing cavity, and the second ring wall is at least partially located inside the end of the bearing cavity.

[0012] The inner side of the second clamping groove is further provided with a second sealing member, and the second sealing member is adapted to sealingly connect with the end of the second assembly wall.

[0013] In some embodiments, a wheel cover is further included, the wheel cover is adapted to be clamped and fixed to the other end of the rolling body, the wheel cover is provided with a third clamping groove, a third sealing member is arranged in the third clamping groove, and the third sealing member is adapted to be sealingly arranged at the other end of the bearing cavity.

[0014] In some embodiments, the rolling body is provided with a third assembly wall at the other end, and the third abutment wall is flush with the inner wall of the end of the bearing cavity.

[0015] The third assembly wall is adapted to abut and fit into the third clamping groove and abut with the third sealing member.

[0016] In some embodiments, the first seal is an oil seal, and the third seal and the second seal are rubber seals.

[0017] In some embodiments, the fixed wheel axle end is further provided with a bearing clamp, which is adapted to abut with the rolling bearing at the other end of the bearing cavity.

[0018] According to another aspect of the present application, a mobile device is further provided, comprising any one of the above preferred embodiments of the universal wheel assembly and a device body, wherein the universal wheel assembly is arranged at the bottom of the device body.

[0019] Compared with the prior art, the universal wheel assembly and the mobile device provided by the present application have at least one of the following beneficial effects:

[0020] 1. The fixed seat is buckled at one end of the roller body, and the first seal is arranged on the fixed seat and adapted to seal one end of the bearing cavity, so that the roller body achieves the effect of dustproof and waterproof, can adapt to various complex working conditions, and improves the service life. Moreover, the first seal is located on the outside of the bearing cavity, the first seal and the rolling bearing are respectively located on the fixed seat and the roller body, and the assembly gap is further arranged between the first ring wall and the first assembly wall, so that the coaxiality error of the fixed wheel axle, the rolling bearing and the first seal will not affect the sealing effect of the first seal, and the first seal is prevented from being stuck in the bearing cavity.

[0021] 2. The first ring wall is abutted and installed in the assembly groove between the first assembly wall and the second assembly wall, and the second assembly wall is abutted and installed in the second clamping groove between the second ring wall and the first ring wall, so that the fixed seat and the roller body are more closely assembled, the installation stability is improved, and the waterproof and dustproof effect is also increased.

[0022] 3. The wheel cover is fixedly installed at the other end of the roller body, and the third seal is arranged on the wheel cover and adapted to seal the other end of the bearing cavity. The third seal, together with the first seal and the second seal, seals both ends of the bearing cavity, so that the bearing cavity is isolated from the outside, and the dustproof and waterproof effect is further enhanced. BRIEF DESCRIPTION OF DRAWINGS

[0023] The above characteristics, technical features, advantages and implementation modes of the present application will be further described in the following preferred embodiments in a clear and understandable manner combined with the drawings.

[0024] Figure 1 is an exploded view of the universal wheel assembly;

[0025] Figure 2 is a cross-sectional view of the fixed seat and the roller body after installation;

[0026] Figure 3is the structural view of the fixed seat;

[0027] Figure 4 is the sectional view of the universal wheel assembly;

[0028] Figure 5 is the sectional view of the wheel cover installation;

[0029] Figure 6 is the structural view of the mobile device;

[0030] Figure 7 is the exploded view of the mobile device.

[0031] BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Roller body 1, bearing cavity 10, rolling bearing 11, first assembly wall 12, assembly groove 120, second clamping block 121, second assembly wall 13, third assembly wall 14, fixed seat 2, assembly gap 20, first ring wall 21, second clamping groove 210, first clamping block 211, second sealing element 212, second ring wall 22, first clamping groove 220, first sealing element 221, wheel cover 3, third clamping groove 30, third sealing element 31, fixed wheel shaft 4, bearing clamp 41, device body 5. DETAILED DESCRIPTION

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, specific implementation manners of the present application will be described below with reference to the drawings. Obviously, the drawings in the following description only represent some embodiments of the present application, and for those skilled in the art, other drawings can be obtained from these drawings without creative labor, and other embodiments can also be obtained.

[0034] In order to make the drawing simple, only the parts related to the present application are shown in the drawings, and they do not represent the actual structure of the product. In addition, in order to make the drawing simple and easy to understand, in some drawings, only one of the parts with the same structure or function is shown, or only one of them is marked. In this paper, "one" not only means "only one", but also means "more than one".

[0035] It should be further understood that the term "and / or" used in the specification and claims of the present application means any combination of one or more of the associated listed items and all possible combinations, and includes these combinations.

[0036] In this article, it is necessary to explain that unless there is a clear and limited definition, the terms "installation", "connection", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0037] In addition, in the description of the present application, the terms "first", "second" and the like are only used for distinguishing description, and cannot be understood as indicating or implying relative importance. It should be pointed out that the above embodiments can be freely combined according to the needs. The above is only the preferred embodiment of the utility model, and it should be pointed out that for ordinary skilled in the art, on the premise of not departing from the principle of the utility model, a number of improvements and refinements can be made, which should be regarded as the protection scope of the utility model.

[0038] Reference Figures 1 to 3 The utility model provides a universal wheel assembly, including gyro wheel body 1, fixed seat 2 and fixed seat 2, gyro wheel body 1 has the bearing cavity 10 that passes through axially, be equipped with a plurality of rolling bearing 11 in bearing cavity 10, gyro wheel body 1 is still equipped with the first assembly wall 12 in the one end outside of bearing cavity 10;Fixed seat 2 includes first ring wall 21, first ring wall 21 is suitable for setting in the first assembly wall 12 inside and the assembly gap 20 is left between first ring wall 21 outer ring and first assembly wall 12 inside wall, still be equipped with first sealing element 221 on fixed seat 2, first sealing element 221 is suitable for sealing setting in one end of bearing cavity 10, fixed wheel axle 4 is suitable for reaching the other end of bearing cavity 10 after passing through fixed seat 2, one end of bearing cavity 10 and rolling bearing 11.

[0039] In the embodiment, the fixed seat 2 is clamped and fixed to one end of the gyro wheel body 1, and the first sealing element 221 is arranged on the fixed seat 2 and adapted to seal one end of the bearing cavity 10, so that the gyro wheel body 1 achieves the effect of dustproof and waterproof, can adapt to various complex working conditions, and improve the service life. Moreover, the first sealing element 221 is located outside the bearing cavity 10, the first sealing element 221 and the rolling bearing 11 are respectively located on the fixed seat 2 and the gyro wheel body 1, and the assembly gap 20 is further arranged between the first ring wall 21 and the first assembly wall 12, which can ensure that the coaxiality error of the fixed seat 2, the rolling bearing 11 and the first sealing element 221 will not affect the sealing effect of the first sealing element 221, and avoid that the first sealing element 221 is stuck in the bearing cavity 10.

[0040] Specifically, without affecting the original function of the roller body 1, the sealing component of the internal bearing cavity 10 is added, which can achieve the dustproof and waterproof effect of the roller body 1, can adapt to complex working conditions such as dust and water, and further improve the service life of the universal wheel assembly. In the embodiment, the first sealing element 221 is not directly installed at the end of the bearing cavity 10 on the roller body 1, but is separately installed in a fixed seat 2, and the fixed seat 2 is snap-fitted to one end of the roller body 1. When the fixed seat 2 is installed on the roller body 1, the first sealing element 221 on the fixed seat 2 is located at and seals the end of the bearing cavity 10. The fixed seat 2 and the roller body 1 are installed by snap-fitting, so that the fixed seat 2 is installed inside the first assembly wall 12 of the roller body 1, and the assembly gap 20 is left between the outer circle of the first ring wall 21 and the inner wall of the first assembly wall 12. The assembly gap 20 can provide a certain radial movement allowance for the fixed seat 2 and the first sealing element 221, which can ensure the coaxiality of the first sealing element 221, the rolling bearing 11 and the fixed seat 2 and does not affect the sealing effect of the first sealing element 221. That is, the fixed seat 2 can move radially in a small range at the end of the roller body 1, thereby driving the first sealing element 221, the rolling bearing 11 and the fixed seat 2 to ensure coaxiality, offset the possible assembly eccentricity, improve the sealing property of the first sealing element 221 and the rotation flexibility of the roller body 1. The first sealing element 221 is located inside the first ring wall 21, and preferably, the fixed seat 2 further comprises a second ring wall 22, which is located inside the first ring wall 21. The inner side of the second ring wall 22 is provided with a first clamping groove 220, and the first sealing element 221 is arranged in the first clamping groove 220. The first clamping groove 220 is used for installing the first sealing element 221 and sealing the connection between the fixed seat 2 and the fixed wheel shaft 4.

[0041] It is worth noting that the application of the present application lies in the control of the coaxiality of the plurality of rolling bearings 11, the first seal 221 and the fixed seat 2, the first seal 221 and the rolling bearings 11 are respectively installed on the two components of the roller body 1 and the fixed seat 2, the two components of the roller body 1 and the fixed seat 2 can be sealingly matched, and there is a certain small assembly gap 20, thereby ensuring the coaxiality consistency of the universal wheel assembly after assembly, and preventing jamming. The first seal 221 is an oil seal. More specifically, the rolling bearings 11 are two, the two rolling bearings 11 are arranged inside the bearing cavity 10 of the roller body 1, the fixed seat 2 is installed on the inner ring of the two rolling bearings 11, and the coaxiality of the fixed seat 2 is determined by the two rolling bearings 11. The first seal 221 is also sleeved on the fixed wheel shaft 4 and sealed by the inner ring of the first seal 221 and the fixed seat 2. It can be understood that the rolling bearings 11, the fixed seat 2 and the first seal 221 all have through holes through which the fixed seat 2 passes. If the coaxiality of the installation position of the first seal 221 and the coaxiality of the two rolling bearings 11 deviates, the inner ring of the first seal 221 and the fixed seat 2 will be misaligned, affecting the sealing effect and the rotation of the roller body 1, which is equivalent to the eccentric rotation of the first seal 221 on the fixed seat 2. If the first seal 221 is installed on the roller body 1, the coaxiality of the installation position of the two rolling bearings 11 on the roller body 1 and the installation position of the first seal 221 is consistent, which is difficult to guarantee, because such products are often plastic parts, and the product itself will have a certain amount of deformation. Therefore, the concept of the present application is that the first seal 221 is independently installed on the fixed seat 2, and the fixed seat 2 is matched with the roller body 1. Because of the assembly gap 20, the fixed seat 2 can move radially in the roller body 1 within a small range, which is equivalent to driving the first seal 221 and the fixed seat 2 to ensure coaxiality, offset the possibility of assembly eccentricity, and improve the sealing performance and the rotation flexibility of the roller body 1.

[0042] Reference Figure 2The assembly gap 20 is located between the first assembly wall 12 and the first ring wall 21, the fixing seat 2 is buckled into the inside of the roller body 1, and there is a certain circumferential play gap, so that the first sealing element 221 can also have a small assembly gap 20 in the inside of the roller body 1, so that the coaxial effect between them can be achieved. The buckle assembly of the fixing seat 2 and the roller body 1 is achieved through the first clamping block 211 and the second clamping block 121. The first ring wall 21 is provided with the first clamping block 211 outside the outer ring, and the first assembly wall 12 is provided with the second clamping block 121 on the inner side wall. The first clamping block 211 is suitable for abutting and fixing with the second clamping block 121, so that the fixing seat 2 is buckled and assembled in the roller body 1. When installing the fixing seat 2, only the fixing seat 2 needs to be pressed into the first assembly wall 12, so that the first clamping block 211 on the outer side of the fixing seat 2 passes through the second clamping block 121 of the first assembly wall 12, and the installation of the fixing seat 2 and the roller body 1 is completed. Preferably, the side away from each other of the first clamping block 211 and the second clamping block 121 can also be provided with a slope, so that the first clamping block 211 can pass through the second clamping block 121 more smoothly. It is worth noting that the specific structure of the first clamping block 211 and the second clamping block 121 is not limited further in the application, as long as the buckle installation of the fixing seat 2 and the roller body 1 can be completed.

[0043] Further, the roller body 1 is provided with a second assembly wall 13 at one end of the bearing cavity 10, the second assembly wall 13 is located on the inner side of the first assembly wall 12, and the first assembly wall 12 and the second assembly wall 13 are provided with an assembly groove 120, and the first ring wall 21 is suitable for being abutted and installed in the assembly groove 120; the second ring wall 22 and the first ring wall 21 form a second clamping groove 210, and the second assembly wall 13 is suitable for being abutted and installed in the second clamping groove 210.

[0044] In the embodiment, the first ring wall 21 is abutted and installed in the assembly groove 120 between the first assembly wall 12 and the second assembly wall 13, and the second assembly wall 13 is abutted and installed in the second clamping groove 210 between the second ring wall 22 and the first ring wall 21, so that the assembly of the fixing seat 2 and the roller body 1 is more fitted, the installation stability is improved, and the waterproof and dustproof effect is also increased.

[0045] Specifically, the fixed seat 2 is fixed on the roller body 1, and the fixed seat 2 is provided with a first clamping groove 220 and a second clamping groove 210 at one end, the first clamping groove 220 is provided with a first sealing element 221, the second clamping groove 210 is suitable for abutting and mounting a second assembly wall 13, and the inner side of the second clamping groove 210 is further provided with a second sealing element 212, and the second sealing element 212 is in sealing connection with the end of the second assembly wall 13. The second sealing element 212 is a silica gel sealing ring. After installation, the fixed seat 2, the first sealing element 221 and the second sealing element 212 are installed on the right side of the roller body 1 as a sealing assembly, which plays a role in sealing the right side of the roller body 1. A rolling bearing 11 is also installed on the right side of the roller body 1, the outer ring of the rolling bearing 11 contacts the roller body 1, the inner ring of the rolling bearing 11 contacts the fixed seat 2, and the inner ring of the first sealing element 221 also contacts the surface of the fixed seat 2 to prevent dust and moisture from entering the bearing cavity 10 of the roller body 1 along the inner ring of the fixed seat 2. The second sealing element 212 is installed between the roller body 1 and the fixed seat 2 to form a sealed cavity, thereby achieving the effect of dust and water prevention.

[0046] It is worth noting that the second assembly wall 13 is flush with the inner side wall of the end of the bearing cavity 10, the second ring wall 22 is at least partially located in the end of the bearing cavity 10, the first sealing element 221 on the inner side of the second ring wall 22 matches the end of the bearing cavity 10, and the sealing is completed.

[0047] Further, with reference to Figure 4 and Figure 5 It also includes a wheel cover 3, which is suitable for being clamped and fixed to the other end of the roller body 1, and the wheel cover 3 is provided with a third clamping groove 30, and the third clamping groove 30 is provided with a third sealing element 31, and the third sealing element 31 is suitable for being sealingly arranged at the other end of the bearing cavity 10.

[0048] In this embodiment, the wheel cover 3 is fixedly installed at the other end of the roller body 1, and the wheel cover 3 is provided with a third sealing element 31, which is suitable for sealing the other end of the bearing cavity 10. The third sealing element 31, together with the first sealing element 221 and the second sealing element 212, seals both ends of the bearing cavity 10, so that the bearing cavity 10 is isolated from the outside, further enhancing its dust and water prevention effect.

[0049] Specifically, the wheel cover 3 is also snap-fitted to the other end of the roller body 1, and is different from the fixed seat 2 in that the wheel cover 3 directly covers one end of the roller body 1, the outer circle of the wheel cover 3 is opposite to the outer circle of the snap-fitted roller body 1, and the third sealing element 31 is a special protection for the end of the bearing cavity 10. The roller body 1 is provided with a third assembly wall 14 at the other end, the third assembly wall 14 is flush with the inner side wall of the end of the bearing cavity 10, at this time the third assembly wall 14, the inner side wall of the end of the bearing cavity 10 and the second assembly wall 13 are flush with each other, the third assembly wall 14 is adapted to abut and be installed in the third clamping groove 30 and abut with the third sealing element 31, and the second assembly wall 13 is adapted to abut and be installed in the second clamping groove 210 and abut with the second sealing element 212, so that the inner side wall of the bearing cavity 10 is sealed from the outside. It is worth noting that the bearing cavity 10 is also provided with a placement position at the end for the fixed rolling bearing 11, which can be understood as the diameter of this placement position being larger than the diameter of other positions of the bearing cavity 10, so that the rolling bearing 11 can be fixedly arranged at the end of the bearing cavity 10. The third assembly wall 14 and the second assembly wall 13 are flush with the inner side wall of the end of the bearing cavity 10 where the rolling bearing 11 is installed. The first sealing element 221 is arranged between the outer circle of the fixed seat 2 and the inner circle of the fixed seat 2, thereby sealing the entire bearing cavity 10 from the outside. The third sealing element 31 is a rubber sealing ring. The fixed seat 2 is also provided with a bearing clamp 41 at the end, which is adapted to abut with the rolling bearing 11 at the other end of the bearing cavity 10, and the bearing clamp 41 is used to prevent the roller body 1 from falling off the fixed seat 2, and the end of the fixed seat 2 is fixedly arranged at the other end of the bearing cavity 10.

[0050] In detail, the other rolling bearing 11 is also installed on the left side of the roller body 1, the outer circle of the rolling bearing 11 is in contact with the roller body 1, the bearing clamp 41 is installed on the left side of the roller body 1 and fixed at the left end of the fixed seat 2, preventing the roller body 1 from falling off the fixed seat 2. The wheel cover 3 is installed on the left side of the roller body 1, the third sealing element 31 is installed in the third clamping groove 30 of the wheel cover 3, and the third sealing element 31 is installed between the roller body 1 and the wheel cover 3 to form a sealed cavity, thereby achieving the effect of dust and water prevention.

[0051] It is worth noting that the conventional universal wheel assembly is often not sealed or simply dustproof, and cannot be waterproof, cannot adapt to complex working conditions, or simply improve the waterproof performance of the internal rolling bearing 11, which has a high cost and a risk of failure of the rolling bearing 11 after a long time. The first seal 221, the second seal 212 and the third seal 31 together constitute a sealing mechanism of the roller body 1, which is simple in structure, low in cost, and only needs an oil seal and two silica gel sealing rings to achieve good waterproof effect. The installation of the sealing mechanism is all buckle installation, which can realize the waterproof function without the use of screws and other fasteners. The sealing cavity composed of the three is small, which can effectively protect the rolling bearing 11, prevent dust and water, and maintain the smoothness of the rolling bearing 11.

[0052] Further, with reference to Figure 6 and Figure 7 , the application further provides a mobile device comprising the universal wheel assembly and the device body 5 in any of the above embodiments, and the universal wheel assembly is arranged at the bottom of the device body 5. In this embodiment, the fixed seat 2 is fixed on the roller body 1, the universal wheel assembly composed of the wheel cover 3, the roller body 1 and the fixed seat 2 is internally provided with two rolling bearings 11, the fixed wheel shaft 4 is rotationally connected to the fixed seat 2 and the rolling bearing 11, and the rolling bearing 11 can rotate around the fixed wheel shaft 4 to achieve the purpose of moving the mobile device. The first seal 221, the second seal 212 and the third seal 31 constitute a sealing system of the roller body 1, the first seal 221 is installed in the interior of the fixed seat 2, the fixed seat 2 is installed with the roller body 1, the coaxiality of the first seal 221, the rolling bearing 11 and the fixed seat 2 is ensured, which can ensure consistency and strengthen the sealing effect without affecting the rotation function; prevent external water and dust from entering and affecting the service life of the rolling bearing 11, and avoid causing the roller body 1 to rotate smoothly, jam and other phenomena.

[0053] It should be noted that the above embodiments can be freely combined as needed. The above is only a preferred embodiment of the present application, and it should be noted that for ordinary skilled persons in the technical field, on the premise of not departing from the principle of the present application, a number of improvements and refinements can be made, which should also be considered as the protection range of the present application.

Claims

1. A universal wheel assembly, characterized by, Comprising: A roller body having an axially through bearing cavity, a plurality of rolling bearings are arranged in the bearing cavity, and a first assembly wall is further arranged outside one end of the bearing cavity; A fixed seat comprising a first ring wall, the first ring wall is adapted to be arranged inside the first assembly wall, and an assembly gap is left between the outer circle of the first ring wall and the inner side wall of the first assembly wall, and a first seal is further arranged on the fixed seat, and the first seal is adapted to be sealingly arranged at one end of the bearing cavity; A fixed axle is adapted to pass through the fixed seat, one end of the bearing cavity and the rolling bearings to reach the other end of the bearing cavity.

2. The universal wheel assembly according to claim 1, wherein The outer circle of the first ring wall is further provided with a first clamping block, and the inner side wall of the first assembly wall is further provided with a second clamping block, and the first clamping block is adapted to abut and fix with the second clamping block, so that the fixed seat is snap-fitted on the roller body.

3. The universal wheel assembly according to claim 1, wherein The fixed seat further comprises a second ring wall, which is located opposite to the inside of the first ring wall, and the inside of the second ring wall is provided with a first clamping groove, and the first seal is arranged in the first clamping groove.

4. The universal wheel assembly according to claim 3, wherein The roller body is further provided with a second assembly wall at one end of the bearing cavity, and the second assembly wall is located opposite to the inside of the first assembly wall, and an assembly groove is arranged between the first assembly wall and the second assembly wall, and the first ring wall is adapted to be abutted and installed in the assembly groove; A second clamping groove is formed between the second ring wall and the first ring wall, and the second assembly wall is adapted to be abutted and installed in the second clamping groove.

5. The universal wheel assembly according to claim 4, wherein The second assembly wall is flush with the inner side wall of the end of the bearing cavity, and the second ring wall is at least partially located inside the end of the bearing cavity; A second seal is further arranged inside the second clamping groove, and the second seal is adapted to be sealingly connected with the end of the second assembly wall.

6. The universal wheel assembly according to any one of claims 1-5, further comprising a wheel cover, which is adapted to be snap-fitted on the other end of the roller body, and the wheel cover is provided with a third clamping groove, and a third seal is arranged in the third clamping groove, and the third seal is adapted to be sealingly arranged at the other end of the bearing cavity.

7. The universal wheel assembly according to claim 6, wherein The roller body is provided with a third assembly wall at the other end, and the third assembly wall is flush with the inner side wall of the end of the bearing cavity; The third assembly wall is adapted to be abutted and installed in the third clamping groove and abutted with the third seal.

8. The universal wheel assembly according to claim 6, wherein The first seal is an oil seal, and the third seal and the second seal are rubber sealing rings.

9. The universal wheel assembly according to claim 7, wherein ​ The fixed wheel axle end portion is further provided with a bearing clamp, which is adapted to abut with the rolling bearing at the other end of the bearing cavity.

10. A mobile device, comprising: The application relates to a device main body and a universal wheel assembly, wherein the universal wheel assembly is arranged at the bottom of the device main body.

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