Universal wheel assembly, chassis assembly and cart

Abstract

The utility model relates to the technical field of trundles, and discloses a universal wheel assembly, a chassis assembly and a cart. The universal wheel assembly comprises a fixing frame, balls, a rotating frame, universal wheels and a cover plate; the ball ring, the rotating frame and the rotating shaft are contained in the containing cavity through the cover plate and the fixing frame, the ball ring is limited between the side wall and the top wall of the fixing frame and the peripheral wall and the flange of the rotating frame, other limiting pieces for restraining the ball ring do not need to be additionally arranged, the number of parts is reduced, therefore, the assembling procedure is saved, and the assembling efficiency can be effectively improved. The rotating frame can bear force under the rolling and abutting action of all balls in the ball ring and flexibly rotate relative to the fixed frame, the rolling wheel is partially contained in the containing cavity, effective hiding of the rolling wheel is achieved, and the connecting wall of the rotating frame is connected to the upper end of the peripheral wall so as to stretch into the inner ring space of the ball ring. The rotating shaft is contained in the containing cavity and located between the cover plate and the connecting wall, so that the idler wheel connected to the rotating shaft is further hidden towards the interior of the containing cavity, the rotating shaft can be prevented from being exposed, and the appearance effect is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of casters, in particular to a universal wheel assembly, a chassis assembly and a cart. BACKGROUND

[0002] The bottom of some mobile devices (carts, tables, cabinets, etc.) is connected with universal wheels, which can facilitate movement. The universal wheels are exposed on the chassis of the device as a whole, which not only affects the appearance effect, but also makes the chassis of the device have a high ground clearance, so that the center of gravity is unstable, which is inconvenient to operate and easy to tip over. Some universal wheels with low height provided by related technologies realize the reduction of height by accommodating the upper part of the roller inside a shell, and the roller is connected to the bottom of a rotating disc. A circle of balls is arranged inside the shell through a limiting piece, and the rotating disc abuts below the balls to realize the rotation of the roller. However, in this scheme, the universal wheel assembly has many structural parts, and the assembly is relatively complex, which is not conducive to the improvement of assembly efficiency. CONTENT OF THE UTILITY MODEL

[0003] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application proposes a universal wheel assembly that can simplify assembly. The present application also proposes a chassis assembly and a cart having the universal wheel assembly.

[0004] In a first aspect, the universal wheel assembly of the embodiments of the present application comprises a fixed frame, balls, a rotating frame, a universal wheel and a cover plate. The fixed frame comprises a circumferentially surrounding side wall and a top wall connected to the upper end of the side wall. The cover plate is arranged below the fixed frame and cooperates with the side wall and the top wall to form an accommodation cavity.

[0005] A plurality of balls are arranged in the accommodation cavity and arranged circumferentially to form a ball ring. The outer ring side of the ball ring abuts the side wall, and the upper side of the ball ring abuts the top wall.

[0006] The rotating frame is arranged in the accommodation cavity and comprises a circumferentially surrounding week wall, a connecting wall connected to the upper end of the week wall, and a flange surrounding the outer peripheral side of the lower end of the week wall. The week wall abuts the inner ring side of the ball ring, the flange abuts the lower side of the ball ring, and the connecting wall is provided with a mounting port.

[0007] The universal wheel comprises a roller and a rotating shaft connected to the roller. The roller is arranged in the mounting port, and the top wall and the cover plate are respectively provided with an avoiding port corresponding to the position of the mounting port for avoiding the roller. The two ends of the rotating shaft are exposed to the roller and arranged between the connecting wall and the cover plate.

[0008] According to the universal wheel provided by the embodiments of the present application, the cover plate and the fixing frame house the ball ring, the rotating frame and the rotating shaft in the accommodating cavity, the ball ring is limited between the side wall and the top wall of the fixing frame and the peripheral wall and the flange of the rotating frame, and no other limiting member is needed to constrain the ball ring, thereby reducing the number of parts and saving the assembly process, and the assembly efficiency can be effectively improved. After assembly, the rotating frame can be supported and flexibly rotated relative to the fixing frame under the rolling and abutting of the balls in the ball ring, the roller part is accommodated in the accommodating cavity, the effective hiding of the roller is realized, the lower part of the roller is exposed through the avoiding opening on the cover plate and used for contacting the ground, the connecting wall of the rotating frame is connected to the upper end of the peripheral wall and extends into the inner ring space of the ball ring, the rotating shaft is accommodated in the accommodating cavity and located between the cover plate and the connecting wall, the roller connected to the rotating shaft is further hidden in the accommodating cavity, and the appearance effect can be avoided from being affected by the exposed rotating shaft.

[0009] In the universal wheel assembly of some embodiments of the present application, the connecting wall is provided with an opening downward mounting groove on each of the opposite two side edge portions of the mounting opening, the mounting grooves are aligned along the axial direction of the rotating shaft, the two ends of the rotating shaft are located in the two mounting grooves respectively, and the cover plate abuts against the radially lower side of the rotating shaft.

[0010] In the universal wheel assembly of some embodiments of the present application, the connecting wall comprises a spacing portion and recessed portions located on the two sides of the spacing portion, the two recessed portions are formed by downward recessing the wall body of the connecting wall respectively, and the side wall bodies of the two recessed portions facing each other and the spacing portion enclose the mounting groove.

[0011] In the universal wheel assembly of some embodiments of the present application, the axis of the rotating shaft is higher than the bottom surface of the recessed portion.

[0012] In the universal wheel assembly of some embodiments of the present application, the universal wheel assembly further comprises a connecting member, the fixing frame further comprises a first connecting portion protruding outward on the peripheral side of the side wall, the cover plate is provided with a second connecting portion corresponding to the position of the first connecting portion respectively, and the connecting member is detachably connected with the first connecting portion and the second connecting portion; or the first connecting portion and the second connecting portion are adapted to be connected to the chassis through the connecting member.

[0013] In the universal wheel assembly of some embodiments of the present application, the first connecting portion is arranged on the peripheral side of the lower end of the side wall; when the rotating shaft abuts against the connecting wall upward, the axis of the rotating shaft is flush with or higher than the top surface of the first connecting portion.

[0014] In the universal wheel assembly of some embodiments of the present application, the roller is provided with a central hole, the rotating shaft is coaxially arranged in the central hole, and the axis of the central hole is eccentric relative to the axis of the peripheral wall.

[0015] In the universal wheel assembly of some embodiments of the present application, the diameter of the roller is Ø, and the eccentricity of the axis of the central hole relative to the axis of the peripheral wall is L, wherein: 0.1Ø≤L≤Ø.

[0016] In a second aspect, the chassis assembly of embodiments of the present application comprises a chassis and a plurality of universal wheel assemblies, the chassis is provided with a plurality of accommodating grooves, and each of the accommodating grooves is provided with a universal wheel assembly, and the fixing frame and the cover plate are connected to the chassis.

[0017] In the chassis assembly of embodiments of the present application, the universal wheel assembly adopts the universal wheel assembly of the first aspect described above, so that the assembly process can be saved, thereby saving the overall assembly process of the chassis assembly, and the universal wheel assembly can further hide the roller in the accommodating cavity, so that the ground clearance of the chassis connected to the bottom of the chassis can be reduced, and the appearance effect can be avoided due to the exposure of the rotating shaft.

[0018] In a third aspect, the stroller of embodiments of the present application comprises the chassis assembly of the second aspect described above, and the ground clearance of the chassis is reduced, which is beneficial to improve the stability of the stroller, reduce the probability of tipping over, and improve the safety.

[0019] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 FIG. 1 is a structural schematic diagram of a universal wheel assembly according to an embodiment of the present application;

[0021] Figure 2 FIG. 2 is an exploded schematic diagram of the universal wheel assembly according to an embodiment of the present application;

[0022] Figure 3 FIG. 3 is a top view of the universal wheel according to an embodiment of the present application;

[0023] Figure 4 FIG. 4 is a schematic diagram of the universal wheel assembly according to an embodiment of the present application; Figure 3 FIG. 5 is a schematic diagram of the A-A cross-sectional view of the universal wheel assembly;

[0024] Figure 5 FIG. 6 is a schematic diagram of the B-B cross-sectional view of the universal wheel assembly, in which the roller is omitted; Figure 3

[0025] Figure 6 FIG. 7 is a structural schematic diagram of the rotating frame according to an embodiment of the present application;

[0026] Figure 7 FIG. 8 is a structural schematic diagram of the stroller according to an embodiment of the present application;

[0027] Figure 8 FIG. 9 is a structural schematic diagram of the chassis assembly according to an embodiment of the present application;​

[0028] Figure 9 For Figure 7 a local enlarged view of C in FIG. 1B.

[0029] Reference signs:

[0030] Universal wheel assembly 100;

[0031] Fixed frame 110; side wall 111; top wall 112; first avoiding opening 113; first connecting part 114;

[0032] Ball ring 120; ball 121; inner ring side 122; outer ring side 123;

[0033] Rotary frame 130; peripheral wall 131; flange 132; connecting wall 133; mounting opening 134; mounting groove 135; first recess 136; second recess 137; spacing part 138; draw wall 139;

[0034] Universal wheel 140; roller 141; rotating shaft 142; central hole 143; axis 144;

[0035] Cover plate 150; second connecting part 151; second avoiding opening 152;

[0036] Connecting piece 160;

[0037] Chassis assembly 200; chassis 210; accommodating groove 220; stand 300; mounting panel 400. DETAILED DESCRIPTION

[0038] The concept and the resulting technical effects of the present application will be described below in conjunction with embodiments so as to fully understand the purpose, features and effects of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments of the present application, other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0039] In the description of the embodiments of the present application, if the orientation description such as "up", "down", "front", "back", "left", "right" and the like is involved, the orientation or position relationship shown based on the drawings is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or the apparatus must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0040] In the description of the embodiments of the present application, if a certain feature is referred to as "provided", "fixed", "connected", "installed" to another feature, it can be directly provided, fixed, connected, installed to the other feature, or indirectly provided, fixed, connected, installed to the other feature. In the description of the embodiments of the present application, if "several" is referred to, it means more than one, if "multiple" is referred to, it means more than two, and if "greater than", "less than", "more than" is referred to, it should be understood as not including the number itself. If "above", "below", "within" is referred to, it should be understood as including the number itself. If "first", "second" is referred to, it should be understood as being used to distinguish technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.

[0041] The universal wheel assembly of the embodiments of the present application can be applied to devices such as carts, shelves, tables, cabinets, etc., and is installed at the bottom of the chassis of the device, which can facilitate the movement of the device. The universal wheel assembly of the embodiments of the present application can improve the concealment of the rollers, reduce the height of the chassis, and improve the stability and appearance of the device. The embodiments of the present application are introduced below in conjunction with the drawings of the specification:

[0042] Reference Figure 1 and Figure 2 The universal wheel assembly 100 of the embodiments of the present application includes a fixed frame 110, a plurality of balls 121, a rotating frame 130, a universal wheel 140, and a cover plate 150. The fixed frame 110 and the cover plate 150 form a containing cavity, the rotating frame 130 and the balls 121 are arranged in the containing cavity and move therein, the plurality of balls 121 are arranged in the containing cavity and arranged in a circle to form a ball ring 120, the ball ring 120 is limited between the fixed frame 110 and the rotating frame 130, the fixed frame 110 abuts the outer peripheral side and the upper side of the ball ring 120, and the rotating frame 130 abuts the inner peripheral side and the lower side of the ball ring 120, so that the rotating frame 130 can bear force and rotate flexibly relative to the fixed frame 110 under the rolling and abutting action of each ball 121 in the ball ring 120.

[0043] Further referring to Figures 2 to 4 , the fixed frame 110 includes a side wall 111 that is circumferentially surrounded and a top wall 112 connected to the upper end of the side wall 111, and the cover plate 150 is arranged below the fixed frame 110 and forms a containing cavity together with the side wall 111 and the top wall 112. The rotating frame 130 includes a circumferential wall 131, a connecting wall 133, and a flange 132, the circumferential wall 131 is circumferentially surrounded and located on the inner side of the side wall 111 of the fixed frame 110, the connecting wall 133 is connected to the upper end of the circumferential wall 131, and the flange 132 is circumferentially arranged on the outer peripheral side of the lower end of the circumferential wall 131.

[0044] The outer ring side 123 of the ball ring 120 abuts against the side wall 111 of the fixed frame 110, the upper side of the ball ring 120 abuts against the top wall 112 of the fixed frame 110, the peripheral wall 131 abuts against the inner ring side 122 of the ball ring 120, and the flange 132 abuts against the lower side of the ball ring 120. Thus, the peripheral wall 131 of the rotating frame 130 is spacedly arranged on the inner side of the side wall 111 of the fixed frame 110, the flange 132 of the rotating frame 130 is located below the top wall 112 of the fixed frame 110, the outer side and the upper side of each ball 121 are respectively abutted by the side wall 111 and the top wall 112 of the fixed frame 110, and the inner side and the lower side of each ball 121 are respectively abutted by the peripheral wall 131 and the flange 132 of the rotating frame 130. The balls 121 are limited between the fixed frame 110 and the rotating frame 130, and no other limiting member is additionally arranged for restraining the ball ring 120, thereby reducing unnecessary accessory assembly parts, improving structural efficiency, and effectively saving assembly procedures due to the reduction of the number of parts.

[0045] The universal wheel 140 includes a roller 141 and a rotating shaft 142 connected to the roller 141. The connecting wall 133 is provided with a mounting opening 134, the roller 141 is arranged in the mounting opening 134, and the two ends of the rotating shaft 142 are exposed to the roller 141 and arranged between the connecting wall 133 and the cover plate 150. After assembly, the rotating shaft 142 is accommodated in the accommodating cavity and located between the cover plate 150 and the connecting wall 133, so that the appearance effect is not affected by the exposure of the rotating shaft 142. The two ends of the rotating shaft 142 are located inside the peripheral wall 131 of the rotating frame 130, so that the peripheral wall 131 can limit the axial limit position of the rotating shaft 142, avoid the rotating shaft 142 from moving and falling off, and no additional limiting member or other limiting structure needs to be arranged on the rotating shaft 142, which is beneficial to simplify the assembly process.

[0046] The top wall 112 of the fixed frame 110 is provided with a first avoiding opening 113 corresponding to the position of the mounting opening 134 for avoiding the roller 141, and the cover plate 150 is also provided with a second avoiding opening 152 corresponding to the position of the mounting opening 134 for avoiding the roller 141. The lower part of the roller 141 is exposed through the second avoiding opening 152 of the cover plate 150 for contacting the ground and bearing force. Thus, the fixed frame 110 and the cover plate 150 do not occupy height space, the distance between the top wall 112 of the fixed frame 110 and the bottom of the cover plate 150 is less than the diameter of the roller 141, and the diameter of the roller 141 is the overall height of the universal wheel assembly 100. When the universal wheel assembly 100 is arranged at the bottom of the chassis 210 connected above the fixed frame 110, the roller 141 is partially accommodated in the accommodating cavity, which can not only reduce the height of the chassis 210, but also effectively hide the roller 141.

[0047] Take the stroller as an example (other devices are the same), the stroller is connected with universal wheels 140 through chassis 210, if the ground clearance of chassis 210 is too high, it is easy to cause the center of gravity of the stroller to be unstable, to shake easily when moving, to require a larger pushing force, and to be easy to tip over when standing still, and the rollers 141 and the shafts 142 are exposed below the chassis 210, affecting the appearance of the stroller. The universal wheel assembly 100 of the embodiment of the application is applied to the stroller, and the stroller includes a chassis assembly 200 (refer to Figures 7 to 9 ), the chassis assembly 200 includes a chassis 210, and the universal wheel assembly 100 of the embodiment of the application is connected through the bottom of the chassis 210. On the one hand, the height of the chassis 210 can be reduced, the ground clearance H is reduced, the center of gravity of the stroller is lowered, the risk of shaking or tipping over is reduced, the stability of the stroller is improved, the pushing force when moving is reduced, the movement is more stable, and the stroller is more convenient to control; on the other hand, the shafts 142 and part of the rollers 141 are hidden in the accommodating cavity, the exposure is reduced, the chassis 210 is lowered, and the part of the rollers 141 exposed below the chassis 210 is less likely to be observed by the user, so that the stroller has better concealment, the appearance of the stroller is more compact and coordinated, and has better appearance.

[0048] When in use, the chassis 210 can be connected through the fixed frame 110, when the rollers 141 abut against the ground to bear the force, the shafts 142 abut against the connecting wall 133 of the rotating frame 130, the rotating frame 130, the ball ring 120 and the fixed frame 110 form a structure similar to a rolling bearing, the rotating frame 130 abuts against the ball ring 120 through the flange 132 to bear the longitudinal force, and abuts against the inner ring side 122 of the ball ring 120 through the peripheral wall 131 to bear the lateral force in each direction, the stress of the rotating frame 130 is effectively balanced, the stable operation of the rollers 141 is ensured, and the stroller is kept to move stably, and when standing still, the stroller can also bear the force stably, and the risk of tipping over is reduced.

[0049] Reference Figure 1 and Figure 2In some embodiments, the universal wheel assembly 100 further comprises a connecting member 160, the fixing frame 110 further comprises a first connecting portion 114 protruding from the outer circumferential side of the side wall 111, and the cover plate 150 is provided with a second connecting portion 151 corresponding to the position of the first connecting portion 114. The first connecting portion 114 can be a flange structure integrally formed with the side wall 111, or can be a separate connecting piece connected to the outer circumferential side of the side wall 111 by fixed connection. The first connecting portion 114 and the second connecting portion 151 can be adapted to be connected to the chassis 210 by the connecting member 160. Correspondingly, the chassis 210 is provided with a mounting portion at a corresponding position, so that when assembling, only the respective components of the universal wheel assembly 100 are placed in the corresponding mounting portion of the chassis 210, and the first connecting portion 114, the second connecting portion 151 and the chassis 210 are connected by the connecting member 160, so that the universal wheel assembly 100 can be connected to the chassis 210, without the need to first assemble the universal wheel assembly 100 into a whole (primary assembly) and then connect the fixing frame 110 to the chassis 210 (secondary assembly), thereby saving the assembly process.

[0050] In some embodiments, the connecting member 160 can detachably connect the first connecting portion 114 and the second connecting portion 151, and the universal wheel assembly 100 can be assembled into a whole, facilitating the separate packaging and circulation of the universal wheel assembly 100, avoiding the scattering of internal parts, and facilitating the installation of the universal wheel assembly 100 by connecting the connecting member 160 to the chassis 210, or connecting the first connecting portion 114, the second connecting portion 151 and the chassis 210 by replacing the connecting member 160.

[0051] For example, the connecting member 160 can be a screw, a bolt, a rivet or the like, and the first connecting portion 114, the second connecting portion 151 and the chassis 210 are provided with through holes corresponding to the connecting member 160. In one example, the connecting member 160 is a rivet, and during assembly, the chassis 210 is inverted, the universal wheel assembly 100 is inverted on the mounting portion of the chassis 210, the through holes of the first connecting portion 114, the second connecting portion 151 and the chassis 210 are aligned, and then the rivet is connected by one-time riveting, thereby completing the installation of the universal wheel assembly 100 and the chassis 210. In another example, the connecting member 160 is a bolt and a locking nut, and the first connecting portion 114 and the second connecting portion 151 are detachably connected by the bolt and the locking nut, so that the universal wheel assembly 100 is assembled into a module. When the chassis 210 needs to be connected, the locking nut is unscrewed, the bolt is inserted into the first connecting portion 114, the second connecting portion 151 and the chassis 210, and then the locking nut is locked, thereby completing the connection of the universal wheel assembly 100 and the chassis 210.

[0052] Reference Figure 2 , Figure 4 and Figure 8In some embodiments, the first connecting portion 114 of the fixing frame 110 is arranged at the outer circumferential side of the lower end of the side wall 111, the fixing frame 110 is connected to the bottom plate 210 through the first connecting portion 114, the bottom plate 210 abuts against the top surface of the first connecting portion 114, thereby lowering to the lower side of the top wall 112, and correspondingly, the position of the bottom plate 210 for mounting the universal wheel 140 can be provided with the accommodating groove 220, the part of the universal wheel assembly 100 above the first connecting portion 114 is accommodated in the accommodating groove 220 of the bottom plate 210, and the structure hiding is achieved.

[0053] It can be understood that, since the rotating frame 130 is located inside the side wall 111 of the fixing frame 110, the connecting wall 133 of the rotating frame 130 is connected to the upper end of the circumferential wall 131, and thus the connecting wall 133 is higher than the first connecting portion 114 of the fixing frame 110, and since the rotating shaft 142 is accommodated in the accommodating cavity and located between the cover plate 150 and the connecting wall 133, the two ends of the rotating shaft 142 are located inside the circumferential wall 131 of the rotating frame 130, and thus at least part of the rotating shaft 142 is higher than the top surface of the first connecting portion 114. In some embodiments, when the rotating shaft 142 upwardly abuts against the connecting wall 133, the axis 144 of the rotating shaft 142 is not lower than the top surface of the first connecting portion 114, that is, the axis 144 of the rotating shaft 142 is flush with or higher than the top surface of the first connecting portion 114, and thus after the universal wheel assembly 100 is assembled below the bottom plate 210, the bottom plate 210 abuts against the top surface of the first connecting portion 114, the axis 144 of the rotating shaft 142 is not lower than the bottom surface of the bottom plate 210, and the roller 141 connected to the rotating shaft 142 is further lifted upward relative to the bottom plate 210, thereby further reducing the ground clearance H of the bottom plate 210 when placed on the ground (refer to Figure 9 ).

[0054] Reference Figure 4 In some embodiments, the connecting wall 133 of the rotating frame 130 is respectively provided with an installation slot 135 opening downward at the opposite two side edge portions of the mounting port 134, the installation slot 135 is aligned along the axial direction of the rotating shaft 142, the two ends of the rotating shaft 142 are respectively located in the two installation slots 135, and the cover plate 150 covers the opening of the installation slot 135, thereby limiting the rotating shaft 142 in the installation slot 135. When assembling, the rotating shaft 142 connected with the roller 141 is only needed to be placed in the installation slot 135, and then the cover plate 150 is covered, so as to limit the position of the rotating shaft 142, thereby facilitating and quickening the assembly.

[0055] And, since the peripheral wall 131 of the rotating frame 130 is located inside the ball ring 120, the connecting wall 133 is connected to the upper end of the peripheral wall 131 and extends into the inner ring space of the ball ring 120, so that the distance between the connecting wall 133 and the top wall 112 of the fixed frame 110 is reduced. On this basis, the mounting groove 135 opening downward is arranged on the connecting wall 133 for accommodating the rotating shaft 142, so that the distance between the rotating shaft 142 and the top wall 112 of the fixed frame 110 is reduced, and the rotating shaft 142 and the roller 141 connected to the rotating shaft 142 are closer to the top wall 112 of the fixed frame 110, so that the roller 141 is further hidden in the accommodation cavity, and the ground clearance H of the chassis 210 is further reduced, thereby improving the stability of the stroller.

[0056] Reference Figures 3 to 5 In some embodiments, the connecting wall 133 includes a spacing portion 138 and recessed portions located on both sides of the spacing portion 138. The two recessed portions are respectively formed by the wall body of the connecting wall 133 being recessed downward. The recessed portions can strengthen the connecting wall 133 and improve the deformation resistance of the connecting wall 133, which helps to improve the load capacity of the universal wheel assembly 100. At the same time, it is also beneficial for the universal wheel assembly 100 to improve the load capacity by increasing the size. Specifically, in other technical universal wheel assemblies, the rotating frame 130 generally adopts a flat plate type, and the rotating shaft 142 is connected by a pivot ear arranged below the flat plate type rotating frame 130. In this scheme, the load bearing capacity of the rotating frame 130 and the pivot ear is limited. If the load capacity needs to be increased, the flat plate type rotating frame 130 and the pivot ear need to be thickened while increasing the size, which will result in a significant increase in weight. However, the embodiments of the present application can effectively improve the deformation resistance by the recessed structure on the connecting wall 133, so that the radial size of the side wall 111 of the fixed frame 110 and the peripheral wall 131 of the rotating frame 130 can be increased. The radial size of the connecting wall 133 is increased accordingly. The connecting wall 133 directly bears the pressure of the rotating shaft 142. By arranging the recessed structure, the overall strength of the connecting wall 133 can be effectively increased, and the deformation resistance can be improved. After the radial size of the side wall 111 and the peripheral wall 131 is increased, the number of balls 121 can be increased. In some examples, 40 to 45 (including 40 and 45) balls 121 can be arranged between the side wall 111 and the peripheral wall 131. The number of balls 121 is increased, and the ball ring 120 surrounded by the balls 121 is also increased, so that the load bearing range is larger. Not only the load capacity is improved, but also the load can be better dispersed, which is beneficial for quickly balancing the multi-directional stress and improving the load capacity and smoothness.

[0057] Reference Figures 4 to 6The two recessed portions are mutually facing, and the side wall body and the spacing portion 138 form the mounting groove 135. Specifically, the connecting wall 133 is recessed downward to form the first recessed portion 136 and the second recessed portion 137 on the wall body on both sides of the position of the rotating shaft 142. The first recessed portion 136 and the second recessed portion 137 can be formed by a stamping process, so that the draw wall 139 is formed in the circumferential direction of the first recessed portion 136 and the second recessed portion 137. The wall body between the first recessed portion 136 and the second recessed portion 137 is not recessed, and is the spacing portion 138. Therefore, the spacing portion 138 is located above the bottom wall of the recessed portion. The draw wall 139 of the two recessed portions is mutually facing, and the spacing portion 138 between the draw wall 139 forms the downwardly opening mounting groove 135.

[0058] After the universal wheel assembly 100 is assembled, the radial top of the rotating shaft 142 can abut to the spacing portion 138, so as to be located in the space of the inner ring side 122 of the ball ring 120. The height space can be effectively utilized. The sum of the height occupied by the ball 121 and the rotating shaft 142 is less than the sum of the diameters of the two, so as to reduce the height occupied by the ball 121 and the rotating shaft 142. The two ends of the rotating shaft 142 are located in the inner side of the circumferential wall 131 of the rotating frame 130, so as to avoid interference with the ball 121.

[0059] Reference Figures 4 to 6 In some embodiments, the axis 144 of the rotating shaft 142 is higher than the bottom surface of the recessed portion, that is, the axis 144 of the rotating shaft 142 is higher than the bottom surface of the first recessed portion 136 and the second recessed portion 137. Therefore, more than half of the rotating shaft 142 in the radial direction is accommodated in the mounting groove 135 formed between the two recessed portions, so as to realize the ultra-low gravity center chassis 210. When the stroller is loaded, the rotating shaft 142 is pushed to the spacing portion 138. The draw wall 139 of the recessed portion can limit the radial movement of the rotating shaft 142 in the horizontal direction, and the position of the rotating shaft 142 in the vertical direction is further limited by the spacing portion 138 and the cover plate 150 below the rotating shaft 142. There can be a gap between the cover plate 150 and the bottom wall of the recessed portion to prevent interference with the rotation of the rotating frame 130. The gap only needs to be less than the radius of the rotating shaft 142, so as to effectively prevent the rotating shaft 142 from falling off, and the rotating shaft 142 and the cover plate 150 are more easily assembled.

[0060] Reference Figure 2 and Figure 3In the embodiment of the present application, the roller 141 is provided with a central hole 143, the rotating shaft 142 is coaxially arranged in the central hole 143, and the axis of the central hole 143 is arranged eccentrically relative to the axis of the peripheral wall 131 of the rotating frame 130. When the universal wheel 140 is subjected to a horizontal thrust, the universal wheel 140 is subjected to an eccentric force due to the eccentric arrangement, so as to drive the rotating frame 130 and the supported rolling ball 121 to rotate in the fixed frame 110 by the horizontal rotation of the rotating shaft 142, until the universal wheel 140 moves forward along the direction of the thrust, so as to realize the turning of the universal wheel 140.

[0061] With reference to Figure 2 And Figure 3 In the universal wheel assembly 100 of some embodiments of the present application, a suitable eccentricity is configured according to the diameter of the roller 141, so as to make the universal wheel 140 have a suitable steering torque and direction stability. Wherein the diameter of the roller 141 is Ø, and the eccentricity of the axis of the central hole 143 relative to the axis of the peripheral wall 131 is L, wherein: 0.1Ø≤L≤Ø. It can be understood that the size of the diameter of the roller 141 affects the carrying capacity, and the universal wheel assembly 100 can configure a roller 141 with a suitable size according to different carrying requirements. The greater the eccentricity of the roller 141, the greater the steering torque, so as to be more labor-saving in steering, but too large eccentricity makes the universal wheel 140 turn by a large amplitude under a small thrust, which is easy to cause slipping and affect the directionality, on the contrary, too small eccentricity makes the steering more labor-consuming and the direction flexibility is poor. In the embodiments of the present application, the eccentricity L is set in the range according to the diameter of the roller 141, so as to be applicable to universal wheels 140 of various purposes, and to optimize the rotation performance, steering torque and direction stability under the premise of guaranteeing the carrying capacity of the required roller 141.

[0062] With reference to Figures 7 to 9 The embodiment of the present application also provides a chassis assembly 200 and a cart with the chassis assembly 200. The chassis assembly 200 comprises a chassis 210 and a universal wheel assembly 100. The chassis 210 is provided with a plurality of accommodating grooves 220, and each of the accommodating grooves 220 is mounted with a universal wheel assembly 100. The universal wheel assembly 100 can connect the fixed frame 110 and the cover plate 150 to the chassis 210 through the connecting piece 160. The universal wheel assembly 100 of the above-mentioned first aspect can save the assembly process, thereby saving the overall assembly process of the chassis assembly 200. The universal wheel assembly 100 can also hide the roller 141 further into the accommodating cavity, so that the chassis 210 connected to the bottom of the chassis 210 can reduce the ground clearance of the chassis 210, and can avoid the exposure of the rotating shaft 142 affecting the appearance effect.

[0063] The chassis assembly 200 comprising the universal wheel assembly 100 can be assembled into an independent component (module) and then assembled with other structural members to obtain a movable device, such as a cart, a table and chair, a cabinet, etc. A plurality of universal wheel assemblies 100 can be arranged in a ring shape under the chassis 210, which can better disperse multidirectional loads and effectively stabilize the lateral force.

[0064] The cart of the embodiments of the present application comprises the chassis assembly 200 of the above embodiments, and the reduced ground clearance of the chassis 210 is beneficial to improve the stability of the cart, reduce the risk of tipping during stopping or moving, and improve safety.

[0065] Reference Figure 7 The cart of some embodiments of the present application can be a television cart support. The television cart support can be used to support a television, comprising a mounting panel 400, a stand 300 and a chassis assembly 200, the stand 300 being connected between the mounting panel 400 and the chassis assembly 200, the mounting panel 400 being used to mount the television, and the universal wheel assembly 100 being connected to the bottom of the chassis 210, which can facilitate the movement of the television to different use scenarios.

[0066] The bottom of the universal wheel 140 of the conventional television cart support is relatively high from the chassis 210, so that the ground clearance of the chassis 210 is high, and thus the overall center of gravity of the television cart support and the television fixed on the upper connecting frame is also relatively high, which is prone to instability of the center of gravity, instability during pushing, and a relatively large required pushing force, and is prone to tipping, especially in earthquake-prone areas, and the excessive exposure of the universal wheel 140 leads to poor appearance of the television cart support.

[0067] The television cart support of the embodiments of the present application adopts the chassis assembly 200 and the universal wheel assembly 100 of some of the above embodiments, which can reduce the height of the chassis 210, lower the center of gravity of the cart, reduce the risk of shaking or tipping, improve the stability of the television cart support, effectively prevent tipping and reduce the pushing force during movement, so that the television cart support can be stably placed and smoothly moved, improve the use experience, and the part of the shaft 142 and the roller 141 is hidden in the accommodating cavity, reducing the exposure, making the appearance of the chassis assembly 200 more compact, and the television cart support more coordinated with the television and the surrounding environment, thereby improving the overall appearance.

[0068] The embodiments of the present application have been described in detail above with reference to the drawings, but the present application is not limited to the above embodiments, and various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the purpose of the present application. In addition, the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

Claims

1. A universal wheel assembly, characterized by, The application relates to a universal wheel assembly. The application relates to a universal wheel assembly. The application relates to a universal wheel assembly. The application relates to a universal wheel assembly. The application relates to a universal wheel assembly. The application relates to a universal wheel assembly.

2. The universal wheel assembly of claim 1, wherein, The application relates to a universal wheel assembly.

3. The omni-wheel assembly of claim 2, wherein, The application relates to a universal wheel assembly.

4. The omni-wheel assembly of claim 3, wherein, The application relates to a universal wheel assembly.

5. The universal wheel assembly of claim 1, wherein, The application relates to a universal wheel assembly.

6. The omni-wheel assembly of claim 5, wherein, The application relates to a universal wheel assembly.

7. The universal wheel assembly of claim 1, wherein, The application relates to a universal wheel assembly.

8. The omni-wheel assembly of claim 7, wherein, The application relates to a universal wheel assembly.

9. A chassis assembly characterized by, The application relates to a universal wheel assembly. The application relates to a universal wheel assembly. The application relates to a universal wheel assembly.

10. Stroller, characterized in that The application relates to a universal wheel assembly. The application relates to a universal wheel assembly. The application relates to a universal wheel assembly. The application relates to a universal wheel assembly. The application relates to a universal wheel assembly. The application relates to a universal wheel assembly. The application relates to a universal wheel assembly. The application relates to a universal wheel assembly. The application relates to a universal wheel assembly. The application relates to a universal wheel assembly. The application relates to a universal wheel assembly. The application relates to a universal wheel assembly. The application relates to a universal wheel assembly. The application relates to a universal wheel assembly. The application relates to a universal wheel assembly. The application relates to a universal wheel assembly. The application relates to a universal wheel assembly. 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