Roller assembly and outdoor power supply equipment

Abstract

The utility model relates to the technical field of energy storage devices, in particular to a roller assembly and outdoor power device.The roller assembly comprises a roller body, at least two bearings and at least one ejector block, the roller body is provided with at least two mounting grooves at intervals in the axial direction of the roller body, and at least one communicating hole is formed in the roller body; every two adjacent mounting grooves are communicated through a communicating hole; the at least two bearings are respectively arranged in the at least two mounting grooves, and inner rings of the bearings are used for an external wheel shaft to pass through; the ejector block is arranged in the communicating hole, the two ends of the ejector block abut against inner rings of the bearings on the two sides of the ejector block respectively, and a penetrating hole allowing the axle to penetrate through is formed in the middle of the ejector block. The roller assembly can effectively improve the strength of the roller assembly, effectively relieve the situation that the structure is damaged when the stress is uneven when the roller assembly obliquely touches the ground on one side, and guarantee the service life.

Description

Technical Field

[0001] The present application relates to the technical field of energy storage devices, and in particular to a roller assembly and an outdoor power supply device. Background Art

[0002] The weight of outdoor power supply devices is getting heavier as the capacity demand increases. To facilitate the movement of outdoor power supply devices, rollers are often provided at the bottom of the housing of the power supply device, and pushing or pulling is used instead of lifting. However, the weight of outdoor power supply devices is getting heavier and has exceeded 60 kg. Currently, the structural strength of the rollers is poor, and the structure is easily damaged when a single-side roller touches the ground obliquely, affecting the service life. Summary of the Utility Model

[0003] The purpose of the present application is to provide a roller assembly and an outdoor power supply device. The roller assembly can effectively improve its own strength, effectively reduce the damage of the structure when the force is uneven due to single-side inclined landing, and ensure the service life.

[0004] To this end, in a first aspect, an embodiment of the present application provides a roller assembly, including: a wheel body, at least two mounting grooves are arranged at intervals along the axial direction of the wheel body, at least one communication hole is arranged in the wheel body, and adjacent two mounting grooves are communicated through the communication hole; at least two bearings are respectively arranged in at least two mounting grooves, and the inner ring of the bearing is for an externally connected wheel shaft to pass through; and at least one top block is arranged in the communication hole, both ends of the top block are respectively abutted against the inner ring of the bearings on both sides of the top block, and a through hole for the wheel shaft to pass through is arranged in the middle of the top block.

[0005] In a possible implementation manner, the communication hole is coaxially arranged with the mounting groove, and the outer diameter of the top block is smaller than the inner diameter of the communication hole.

[0006] In a possible implementation manner, the wheel shaft is arranged in the through hole by an interference fit manner, and the wheel shaft is arranged in the inner ring of the bearing by an interference fit manner.

[0007] In a possible implementation manner, the wheel body includes a hard rubber part and a soft rubber part wrapping the hard rubber part, and the mounting groove and the communication hole are arranged in the hard rubber part.

[0008] In a possible implementation manner, the hard rubber part includes a frame and a retaining rib arranged in the frame, the retaining rib is located between adjacent two mounting grooves, and a communication hole is formed inside the retaining rib.

[0009] In a possible implementation manner, the retaining rib includes an abutting portion connected to the frame, and the abutting portion abuts against one end of the outer ring of the bearing.

[0010] In a possible implementation, the blocking rib further includes an avoidance portion connected to the abutting portion, and the thickness of the avoidance portion along the extending direction of the communication hole is smaller than the thickness of the top block along the extending direction of the communication hole.

[0011] In a possible implementation, the bearing includes a first bearing located at one end of the wheel body and a second bearing located at the other end of the wheel body. The roller assembly further includes an inner cover and a fastener. The fastener is connected to the end of the wheel axle, and the fastener abuts against the inner ring end of the first bearing. The inner cover is sleeved on the outer peripheral side of the wheel axle and abuts against the inner ring end of the second bearing.

[0012] In a possible implementation, the roller assembly further includes an outer cover, and the outer cover is connected to the side of the wheel body away from the inner cover for covering the fastener and the bearing.

[0013] In a second aspect, an embodiment of the present application provides an outdoor power supply device, including: a bottom shell; a wheel axle disposed on the bottom shell; and the above-mentioned roller assembly, and the roller assembly is disposed at the end of the wheel axle.

[0014] According to the roller assembly and the outdoor power supply device provided by the embodiments of the present application, the roller assembly axially arranges a plurality of mounting grooves on the wheel body, and bearings are respectively installed in the plurality of mounting grooves. The inner ring of the bearing is connected to the wheel axle, which increases the contact area between the wheel axle and the bearing, and at the same time increases the contact area between the bearing and the wheel body. The adjacent two bearings are separated by a top block to ensure that the adjacent bearings do not affect each other, and the connection length between the bearing and the wheel body in the axial direction can be further increased. When the roller assembly on one side touches the ground and is unevenly stressed, by increasing the contact length between the bearing and the wheel body and the contact length between the bearing and the wheel axle, the situation of structural damage can be reduced, the self-strength can be improved, and the service life can be guaranteed. Description of the Drawings

[0015] The drawings here are incorporated into the description and form a part of this description, showing embodiments consistent with the present invention and used together with the description to explain the principles of the present invention.

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0017] One or more embodiments are exemplarily illustrated by the pictures in the corresponding drawings. These exemplary illustrations do not limit the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements. Unless otherwise stated, the drawings in the figures do not constitute a proportional limitation.

[0018] Figure 1 Shows an exploded structural schematic diagram of a roller assembly provided by an embodiment of the present application;

[0019] Figure 2 Shows a three-dimensional structural schematic diagram of a roller assembly and a wheel axle provided by an embodiment of the present application;

[0020] Figure 3 Shows a cross-sectional structural schematic diagram of a roller assembly and a wheel axle provided by an embodiment of the present application;

[0021] Figure 4 Shows a three-dimensional structural schematic diagram of a wheel body provided by an embodiment of the present application;

[0022] Figure 5 Shows a structural schematic diagram of another angle of a wheel body provided by an embodiment of the present application;

[0023] Figure 6 Shows a structural schematic diagram of an outdoor power supply device provided by an embodiment of the present application.

[0024] Description of reference numerals:

[0025] 1. Wheel body; 11. Installation groove; 12. Communication hole; 13. Hard rubber part; 131. Frame; 132. Baffle rib; 1321. Contact part; 1322. Avoidance part; 14. Soft rubber part;

[0026] 2. Bearing; 21. First bearing; 22. Second bearing; 3. Top block; 31. Perforation; 4. Wheel axle; 5. Inner cover; 6. Fastener; 7. Outer cover; 8. Bottom shell. Detailed implementation manners

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts shall fall within the protection scope of the present application.

[0028] The following disclosure provides many different embodiments or examples for implementing different structures of the embodiments of the present application. To simplify the disclosure of the embodiments of the present application, the components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit the embodiments of the present application. In addition, the embodiments of the present application may repeat reference numerals and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0029] For ease of description, spatial relative relationship terms may be used in the text to describe the relative positional relationship or movement of one element or feature shown in the figure with respect to another element or feature. These relative relationship terms are, for example, "inside", "outside", "inner side", "outer side", "below", "beneath", "above", "upper", "front", "rear", etc. Such spatial relative relationship terms are intended to include different orientations of the device during use or operation other than the orientations depicted in the figure. For example, if the device in the figure undergoes a position flip, attitude change, or change in motion state, then these directional indications will change accordingly. For example, an element described as "below" or "beneath" other elements or features will then be oriented as "above" or "upper" other elements or features. Therefore, the exemplary term "below" can include both upper and lower orientations. The device can be oriented otherwise (rotated 90 degrees or in other directions) and the spatial relative relationship descriptors used in the text are interpreted accordingly.

[0030] To solve the problems in the prior art, the present application provides a roller assembly and an outdoor power supply device. The roller assembly can effectively improve its own strength, effectively reduce the damage to the structure when the unilateral inclination touches the ground and the stress is uneven, and ensure the service life.

[0031] As Figures 1-6 shown, an embodiment of the present application provides a roller assembly, including a wheel body 1, at least two bearings 2, and at least one top block 3.

[0032] The wheel body 1 is provided with at least two mounting grooves 11 at intervals along its own axis. At least one communication hole 12 is provided in the wheel body 1, and adjacent two mounting grooves 11 are communicated through the communication hole 12.

[0033] At least two bearings 2 are respectively arranged in at least two mounting grooves 11, and the inner ring of the bearing 2 is for an externally connected wheel shaft 4 to pass through.

[0034] The top block 3 is arranged in the communication hole 12. The two ends of the top block 3 respectively abut against the inner rings of the bearings 2 on both sides of the top block 3. A through hole 31 for the wheel shaft 4 to pass through is provided in the middle of the top block 3.

[0035] In this application, by axially arranging a plurality of mounting grooves 11 on the wheel body 1, bearings 2 are respectively installed in the plurality of mounting grooves 11, and the inner ring of the bearing 2 is connected to the wheel axle 4, which increases the contact area between the wheel axle 4 and the bearing 2, and at the same time increases the contact area between the bearing 2 and the wheel body 1. The adjacent two bearings 2 are separated by a top block 3 to ensure that the adjacent bearings 2 do not affect each other, and the connection length between the bearing 2 and the wheel body 1 in the axial direction can be further increased. When one side of the roller assembly touches the ground and is unevenly stressed, by increasing the contact length between the bearing 2 and the wheel body 1 and the contact length between the bearing 2 and the wheel axle 4, the situation of structural damage is reduced, the self-strength is improved, and the service life is guaranteed.

[0036] In the related art, the existing roller assembly generally includes a wheel body 1. A bearing hole is provided on the wheel body 1, a bearing 2 is installed in the bearing hole, a wheel axle 4 passes through the bearing 2 and is connected to a fixing screw. The bearing 2 is limited by the fixing screw and a flat washer, and the other end of the bearing 2 is pressed tightly by an inner cover 5, resulting in less contact between the bearing 2 and the wheel body 1 in the axial direction. When driving on a bumpy road, during the process of falling down the steps or when other single-side roller assemblies touch the ground, the weight is concentrated on one side of the roller assembly, and the roller assembly tilts, so that the mutual force between the roller and the wheel body 1 is more concentrated, which makes the wheel body 1 easily deformed by extrusion, affecting the service life.

[0037] In the embodiment of this application, by axially arranging a plurality of mounting grooves 11 on the wheel body 1, the bearing 2 is arranged in the mounting groove 11, and the adjacent bearings 2 are separated by a top block 3, thereby increasing the contact area between the bearing 2 and the wheel body 1 in the axial direction. When driving on a bumpy road, during the process of falling down the steps or when other single-side roller assemblies touch the ground, when the roller assembly tilts, it can also ensure a large contact area between the roller and the wheel body 1, so as to disperse and evenly distribute the force received by the wheel body 1, thereby avoiding the situation that the wheel body 1 is deformed by extrusion and ensuring the service life of the roller assembly. When applied to an outdoor power supply device, it can bear a heavier gravity and can be applied to an outdoor power supply device with a larger capacity.

[0038] Specifically, two bearings 2 are provided. Two mounting grooves 11 are provided on the wheel body 1. The two mounting grooves 11 are respectively arranged at both axial ends of the wheel set body. The two mounting grooves 11 are communicated through a communication hole 12. The two bearings 2 are press-fitted into the two mounting grooves 11. One top block 3 is provided. Both ends of the top block 3 are respectively abutted against the inner ring ends of the two bearings 2. By providing two bearings 2, the two bearings 2 and the top block 3 are sleeved on the wheel shaft 4. Passing through one bearing 2, the through hole 31 of the top block 3, the communication hole 12 of the wheel body 1, and the other bearing 2 in sequence, the two bearings 2 can be directly inserted into the two mounting grooves 11 from both sides of the wheel body 1, so that the two bearings 2 are respectively abutted against both ends of the top block 3, facilitating the assembly of the roller assembly.

[0039] Optionally, the number of the mounting grooves 11 can also be 3, 4, etc. Correspondingly, the number of the bearings 2 can be 3, 4, etc., and the number of the top blocks 3 can be 2, 3, etc. The top block 3 is used to separate every two adjacent bearings 2, and the outdoor power supply device with a larger weight can be carried.

[0040] In some embodiments, the communication hole 12 is coaxially arranged with the mounting groove 11, and the outer diameter of the top block 3 is smaller than the inner diameter of the communication hole 12.

[0041] In this application, the outer ring of the bearing 2 is in interference fit with the mounting groove 11, and the inner ring of the bearing 2 is in interference fit with the wheel shaft 4. The rotation of the wheel body 1 is realized by the rotation of the rolling balls between the outer ring and the inner ring. The inner ring of the bearing 2 and the wheel shaft 4 do not rotate. The inner rings of adjacent bearings 2 are connected by the top block 3. While separating the bearings 2, the reliability of the connection between the inner rings of multiple bearings 2 and the wheel shaft 4 can be ensured. The top block 3 also does not rotate. The outer diameter of the top block 3 is smaller than the inner diameter of the communication hole 12, so that there is a gap between the top block 3 and the inner wall of the communication hole 12, so that there is no contact between the wheel body 1 and the top block 3, and the top block 3 does not affect the rotation of the wheel body 1, ensuring the smooth rotation of the wheel body 1.

[0042] In some embodiments, the wheel shaft 4 is arranged in the through hole 31 by interference fit, and the wheel shaft 4 is arranged in the inner ring of the bearing 2 by interference fit.

[0043] In this application, the wheel shaft 4 is in interference fit with the top block 3, the through hole 31 and the inner ring of the bearing 2, which can realize the radial positioning of the bearing 2 and ensure the stability of the roller assembly after being installed on the wheel shaft 4. The through hole 31 is also in interference fit with the wheel shaft 4, which can radially position the top block 3, ensure that the top block 3 does not contact the inner wall of the communication hole 12, and the top block 3 can effectively abut against the inner rings of the two bearings 2 on both sides, ensuring the stability of the connection of the inner ring parts of multiple bearings 2.

[0044] In some embodiments, the wheel body 1 includes a hard rubber part 13 and a soft rubber part 14 that wraps the hard rubber part 13. The mounting groove 11 and the communication hole 12 are provided in the hard rubber part 13.

[0045] As Figures 5-6 shown, in the present application, the hard rubber part 13 of the wheel body 1 serves as the main supporting body to ensure its own strength. The soft rubber part 14 is wrapped around the outer peripheral side of the hard rubber part 13, which can increase the shock absorption of the wheel body 1. Specifically, the soft rubber part 14 is made of TPU soft rubber, and the hard rubber part 13 is made of PA hard rubber. The soft rubber part 14 and the hard rubber part 13 are integrally formed, which is convenient for processing and forming, and ensures the integrity and structural stability of the wheel body 1.

[0046] In some embodiments, the hard rubber part 13 includes a frame 131 and a retaining rib 132 provided in the frame 131. The retaining rib 132 is located between two adjacent mounting grooves 11, and a communication hole 12 is formed inside the retaining rib 132.

[0047] In the present application, the frame 131 and the retaining rib 132 of the hard rubber part 13 can be integrally formed. By separating the two mounting grooves 11 with the retaining rib 132, the bearing 2 can be further positioned axially, so that the bearing 2 will not move axially, further ensuring the structural stability of the roller assembly.

[0048] As Figure 6 shown, in some embodiments, the retaining rib 132 includes an abutting portion 1321 connected to the frame 131, and the abutting portion 1321 abuts against one end of the outer ring of the bearing 2.

[0049] In the present application, the outer side of the outer ring of the bearing 2 abuts against the inner side surface of the mounting groove 11, thereby positioning the wheel body 1 radially. The end of the outer ring of the bearing 2 abuts against the abutting portion 1321 of the retaining rib 132, which can position the wheel body 1 axially, and thus complete the double positioning of the wheel body 1 in the axial and radial directions, ensuring the reliability of the connection between the bearing 2 and the wheel body 1.

[0050] As Figure 6 shown, in some embodiments, the retaining rib 132 further includes an avoidance portion 1322 connected to the abutting portion 1321, and the thickness of the avoidance portion 1322 along the extending direction of the communication hole 12 is smaller than the thickness of the top block 3 along the extending direction of the communication hole 12.

[0051] In the present application, the abutment portion 1321 is the outer ring portion of the retaining rib 132, which is connected to the frame 131, and the avoidance portion 1322 is the inner ring portion of the retaining rib 132. The thickness of the avoidance portion 1322 is less than the thickness of the abutment portion 1321, so that the abutment portion 1321 can abut against the outer ring end of the bearing 2, and the thickness of the avoidance portion 1322 is less than the thickness of the top block 3, so that the two ends of the top block 3 can respectively extend from the two ends of the connecting hole 12, so that the two ends of the top block 3 respectively abut against the inner ring ends of the bearing 2 on both sides.

[0052] In some embodiments, the bearing 2 includes a first bearing 21 located at one end of the wheel body 1 and a second bearing 22 located at the other end of the wheel body 1. The roller assembly also includes an inner cover 5 and a fastener 6. The fastener 6 is connected to the end of the wheel axle 4. The fastener 6 abuts against the inner ring end of the first bearing 21. The inner cover 5 is sleeved on the outer peripheral side of the wheel axle 4 and abuts against the inner ring end of the second bearing 22.

[0053] The roller assembly in the present application is applied to outdoor power supply equipment, and the roller assembly can be rotatably arranged at the end of the wheel shaft 4. For example, there can be two roller assemblies, which can be rotatably arranged at the two ends of the wheel shaft 4, and the wheel shaft 4 is fixed on the bottom shell 8 of the outdoor power supply equipment. The side of the roller assembly facing the bottom shell 8 is defined as the inner side, and the side away from the bottom shell 8 is defined as the outer side, wherein the first bearing 21 is located on the outer side, and the second bearing 22 is located on the inner side, one end of the inner cover 5 abuts against the inner ring end of the second bearing 22, and the other end abuts against the bottom shell 8, thereby pressing and limiting the second bearing 22, so that the second bearing 22 will not be separated from the installation groove 11. The fastener 6 is connected to the wheel shaft 4, and the first bearing 21 is limited by the fastener 6, so that the first bearing 21 will not be separated from the installation groove 11.

[0054] Specifically, the fastener 6 is a bolt, and a thread groove is provided at the end of the axle 4. The bolt and the thread groove are threadably matched, and the nut part of the bolt abuts against the inner ring end of the first bearing 21, thereby limiting the first bearing 21 in the axial direction.

[0055] In some embodiments, the roller assembly further includes an outer cover 7 , which is connected to a side of the wheel body 1 away from the inner cover 5 and is used to cover the fastener 6 and the bearing 2 .

[0056] In the present application, the outer cover 7 is connected to the hard rubber part 13 of the wheel body 1, and the outer cover 7 covers the outer side of the roller assembly, thereby protecting the bearing 2 and the fastener 6, and preventing dust and the like from entering the outer cover 7 and contaminating the bearing 2 and the fastener 6.

[0057] Specifically, the outer cover 7 and the wheel body 1 are positioned by positioning columns and fixed by snap fastenings, so that the outer cover 7 can be easily installed.

[0058] The roller assembly is provided with a plurality of mounting grooves 11 along the axial direction on the wheel body 1, and bearings 2 are respectively installed in the plurality of mounting grooves 11, and the inner ring of the bearing 2 is connected to the wheel axle 4, thereby increasing the contact area between the wheel axle 4 and the bearing 2, and at the same time increasing the contact area between the bearing 2 and the wheel body 1. Two adjacent bearings 2 are separated by a top block 3 to ensure that the adjacent bearings 2 do not affect each other and can further increase the axial connection length between the bearing 2 and the wheel body 1. When the roller assembly on one side is unevenly subjected to the ground force, the contact length between the bearing 2 and the wheel body 1 and the contact length between the bearing 2 and the wheel axle 4 are increased to reduce the damage to the structure, improve its own strength, and ensure the service life.

[0059] like Figure 6 As shown, an embodiment of the present application provides an outdoor power supply device, including: a bottom shell 8; an axle 4, which is arranged on the bottom shell 8; and the above-mentioned roller assembly, which is arranged at the end of the axle 4.

[0060] In the present application, the bottom shell 8 of the outdoor power supply equipment is used to carry the power supply part, the wheel axle 4 is arranged on the bottom shell 8, and roller assemblies are arranged at both ends of the wheel axle 4, and the movement of the outdoor power supply equipment is realized by rolling the roller assemblies on both sides. Since the power supply part has a large weight, generally more than 30kg, by adopting the roller assembly in the present application, the strength of the roller assembly structure itself can be guaranteed, the width of the contact surface between the wheel axle 4 and the inner ring of the bearing 2 is increased, and the force bearing area of the wheel and the bearing 2 is also increased, and the force bearing area is increased to disperse the impact force that damages the wheel; the wheel inner cover 5 is removed to fit the plastic part of the wheel axle 4 assembled on the inner ring of the bearing 2, so as to avoid the plastic part being sandwiched between the two hardware parts of the wheel axle 4 and the bearing 2, and the impact force plastic is easy to fatigue and deform, causing the wheel to shake greatly and aggravate the damage to the wheel.

[0061] It should be understood that the terms used herein are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "" as used herein may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive and therefore specify the presence of stated features, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0062] Although terms such as first, second, third, etc. may be used herein to describe multiple elements, components, regions, layers, and / or sections, these elements, components, regions, layers, and / or sections should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or section from another region, layer, or section. Unless the context clearly indicates otherwise, terms such as "first", "second", and other numerical terms do not imply an order or sequence when used in this document. Thus, the first element, component, region, layer, or section discussed below may be referred to as the second element, component, region, layer, or section without departing from the teachings of the exemplary embodiments.

[0063] The above are only specific embodiments of the present application, enabling those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but rather to the broadest scope consistent with the principles and novel features claimed herein.

Claims

1. A roller assembly, characterized in that, Comprising: A wheel body (1), at least two mounting grooves (11) are arranged at intervals along the axial direction of the wheel body (1), at least one communication hole (12) is arranged in the wheel body (1), and two adjacent mounting grooves (11) are communicated through the communication hole (12); At least two bearings (2), which are respectively arranged in the at least two mounting grooves (11), and the inner ring of the bearing (2) is for an externally connected wheel shaft (4) to pass through; and, At least one top block (3), the top block (3) is arranged in the communication hole (12), both ends of the top block (3) are respectively abutted against the inner rings of the bearings (2) on both sides of the top block (3), and a through hole (31) for the wheel shaft (4) to pass through is arranged in the middle of the top block (3).

2. The roller assembly according to claim 1, characterized in that, The communication hole (12) is coaxially arranged with the mounting groove (11), and the outer diameter of the top block (3) is smaller than the inner diameter of the communication hole (12).

3. The roller assembly according to claim 1, characterized in that, The wheel shaft (4) is arranged in the through hole (31) by an interference fit manner, and the wheel shaft (4) is arranged in the inner ring of the bearing (2) by an interference fit manner.

4. The roller assembly according to claim 1, characterized in that, The wheel body (1) includes a hard rubber part (13) and a soft rubber part (14) wrapping the hard rubber part (13), and the mounting groove (11) and the communication hole (12) are arranged in the hard rubber part (13).

5. The roller assembly according to claim 4, wherein The hard rubber part (13) includes a frame (131) and a retaining rib (132) arranged in the frame (131), the retaining rib (132) is located between two adjacent mounting grooves (11), and the communication hole (12) is formed inside the retaining rib (132).

6. The roller assembly according to claim 5, wherein, The retaining rib (132) includes an abutting part (1321) connected to the frame (131), and the abutting part (1321) abuts against one end of the outer ring of the bearing (2).

7. The roller assembly according to claim 6, characterized in that, The retaining rib (132) further includes an avoiding part (1322) connected to the abutting part (1321), and the thickness of the avoiding part (1322) along the extending direction of the communication hole (12) is smaller than the thickness of the top block (3) along the extending direction of the communication hole (12).

8. The roller assembly according to claim 1, wherein The bearing (2) includes a first bearing (21) at one end of the wheel body (1) and a second bearing (22) at the other end of the wheel body (1), the roller assembly further includes an inner cover (5) and a fastener (6), the fastener (6) is connected to the end of the wheel shaft (4), the fastener (6) abuts against the end of the inner ring of the first bearing (21), and the inner cover (5) is sleeved on the outer peripheral side of the wheel shaft (4) and abuts against the end of the inner ring of the second bearing (22).

9. The roller assembly according to claim 8, wherein, The roller assembly further includes an outer cover (7), and the outer cover (7) is connected to the side of the wheel body (1) away from the inner cover (5) for covering the fastener (6) and the bearing (2).

10. An outdoor power supply device, characterized in that, Comprising: A bottom shell (8); A wheel shaft (4), which is arranged on the bottom shell (8); And The roller assembly according to any one of claims 1-9, and the roller assembly is arranged at the end of the wheel shaft (4).

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