An electrically powered luggage caster assembly

Abstract

The utility model provides a kind of electric suitcase universal wheel assembly, including upper wheel seat, lower wheel seat and switch button, lower wheel seat is rotatably installed in the lower end of upper wheel seat, and its rotation axis is parallel with the rotation axis of upper wheel seat or coaxial, eccentricity is provided with front wheel body on lower wheel seat;Switch button is slidably fitted on upper wheel seat and its sliding axis is perpendicular to the rotation axis of lower wheel seat, and upper wheel seat is equipped with elastic component, the side wall of switch button is equipped with clamping block, and lower wheel seat is equipped with clamping groove;When clamping block is aligned with clamping groove and is clamped into clamping groove under the force of elastic component, switch to directional wheel state;When pressing switch button and making clamping block disengage from the clamping groove, lower wheel seat can rotate relative to the upper wheel seat and switch to universal wheel state.The utility model electric suitcase universal wheel assembly, its structure is simple and compact, small installation space, low manufacturing cost, easy to assemble, convenient and fast to switch, and good use effect.

Description

Technical Field

[0001] This utility model relates to a universal wheel, and more particularly to an electric luggage universal wheel assembly. Background Technology

[0002] With the improvement of people's living standards and the convenience of travel, electric suitcases are increasingly favored by travelers due to their labor-saving and convenient features. However, existing electric suitcases still have some shortcomings in actual use.

[0003] All existing electric suitcases use a fixed wheel structure with the pull rod located on the rear. They cannot turn when pushed horizontally, and the suitcase cannot rotate on its own. When using the pull rod to pull the suitcase, the suitcase needs to be turned around to move it, resulting in a poor user experience and making it easy for the suitcase to tip over.

[0004] The applicant's research found that applying omnidirectional wheels that can be switched to fixed wheels to electric suitcases can effectively improve steering flexibility and handling stability, especially the front wheels of the suitcase. However, existing omnidirectional wheel switching structures generally suffer from problems such as complex structure, inconvenient operation, and easy jamming, which affect the user experience. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide an electric luggage universal wheel assembly that is compact in structure, easy to operate, and can quickly switch between fixed wheels and universal wheels.

[0006] This utility model provides an electric luggage universal wheel assembly, which includes an upper wheel seat 41, a lower wheel seat 42, and a switching button 43. The upper wheel seat 41 is rotatably mounted on the front wheel base of the electric luggage. The lower wheel seat 42 is rotatably mounted on the lower end of the upper wheel seat 41, and its rotation axis is parallel or coaxial with the rotation axis of the upper wheel seat 42. The front wheel body 46 is eccentrically arranged on the lower wheel seat 42. The switching button 43 is slidably mounted on the upper wheel seat 41, and its sliding axis is perpendicular to the rotation axis of the lower wheel seat 42. The upper wheel seat 41 is provided with an elastic component 47 that gives the switching button 43 an outward movement tendency. The side wall of the switching button 43 is provided with a locking block 433, and the lower wheel seat 42 is provided with a slot 4211 that can accommodate the locking block 433. When the locking block 433 is aligned with the locking groove 4211 and is locked into the locking groove 4211 under the force of the elastic member 47, the lower wheel seat 42 is connected to the upper wheel seat 41 and can rotate synchronously with the upper wheel seat 41. When the switching button is pressed and the card block 433 is disengaged from the card slot 4211, the lower wheel seat 42 can rotate relative to the upper wheel seat 41.

[0007] Furthermore, the opening direction of the slot 4211 is perpendicular to the rotation axis of the front wheel body 46 and is located on the side close to the rotation axis of the front wheel body 46.

[0008] Furthermore, the top surface of the lower wheel seat 42 is provided with an annular receiving groove 4210, the annular receiving groove 4210 is coaxial with the rotation axis of the lower wheel seat 42, and the side wall of the annular receiving groove 4210 extends outward to form the slot 4211. When in the directional wheel state, the locking block 433 is located in the slot 4211; when in the universal wheel state, the locking block 433 is located in the annular receiving groove 4210.

[0009] Furthermore, the bottom surface of the upper wheel seat 41 is provided with an annular protrusion 413 that can be inserted into the annular receiving groove 4210 and rotate. The annular protrusion 413 is provided with a block receiving groove 4130, which is used to receive the block 433 in the universal wheel state and to support the elastic component.

[0010] Furthermore, the outer end face of the card block 433 is an arc-shaped surface and serves as the first working surface 433a. The axis of the first working surface 433a is coaxial with the rotation axis of the lower wheel seat 42, and the inner wall of the annular receiving groove 4210 serves as the second working surface.

[0011] Furthermore, the first working surface 433a and / or the second working surface are made of a lubricating material or have a lubricating layer disposed on their surfaces.

[0012] Furthermore, a strip groove 415 is formed on the bottom surface of the upper wheel seat 41. The length direction of the strip groove 415 is perpendicular to and intersects the axis of the upper wheel seat 41. A sliding groove is formed between the strip groove 415 and the lower wheel seat 42. The switching button 43 is horizontally slidably fitted in the sliding groove. A limiting groove 4150 is provided on one or both sides of the strip groove 415. The lower end of the limiting groove 4150 extends outside the strip groove 415. A limiting protrusion 434 corresponding to the limiting groove 4150 is provided on the side wall of the switching button 43. Furthermore, the switching button 43 includes a guide block 431, the outer end face of the guide block 431 is provided with a cylindrical body and forms a pressing part 432, and an outward first limiting surface is formed between the guide block 431 and the pressing part 432; the lower end of the guide block 431 is provided with a locking block 433, and the inner end face of the guide block 431 is provided with a spring hole for installing an elastic component.

[0013] Furthermore, the width of the card block 433 is smaller than the width of the guide block 431, and a downward-facing second limiting surface is formed between the two.

[0014] Furthermore, the inner end face of the card block 433 is flush with the inner end face of the guide block 431 and both are arc-shaped surfaces, and the arc-shaped surfaces are coaxial with the rotation axis of the lower wheel seat 42.

[0015] This utility model relates to an electric luggage universal wheel assembly. The state can be switched by pressing the switch button, and the elastic parts automatically reset. The operation is simple and efficient, and the switching is convenient. In conjunction with the automatic extension and retraction of the electric luggage, the universal wheel state can be quickly switched. Its structure is simple and compact, the installation space is small, the manufacturing cost is low, the assembly is convenient, the switching is convenient and quick, and the use effect is good. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the electric luggage box universal wheel assembly of this utility model; Figure 2 This is a cross-sectional view of the electric luggage box universal wheel assembly of this utility model; Figure 3 This is an exploded structural diagram of the electric luggage box universal wheel assembly of this utility model; Figure 4 This is a schematic diagram showing the installation of the switching button for the electric luggage box universal wheel assembly of this utility model; Figure 5 This is a schematic diagram of the switching button for the electric luggage box universal wheel assembly of this utility model; Figure 6 This is a cross-sectional view of the electric luggage box universal wheel assembly of this utility model; Figure 7 A diagram showing the location of the toggle button when in directional mode; Figure 8 This is a cross-sectional view of the caster wheel assembly in its directional state. Figure 9 A diagram showing the location of the toggle button in omnidirectional mode; Figure 10 This is a cross-sectional view of the caster wheel assembly in its omnidirectional configuration.

[0017] Figure 11 This is a schematic diagram illustrating the installation and use of the universal assembly of the electric luggage box of this utility model; Figure 12 This is a cross-sectional view of the limiting structure of the electric luggage box universal wheel assembly of this utility model; Figure 13 This is a schematic diagram of the front wheel base of the electric luggage universal wheel assembly of this utility model. Detailed Implementation

[0018] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0019] See Figures 1-13This utility model provides an electric luggage universal wheel assembly 4, which can quickly switch between fixed wheel mode and universal wheel mode.

[0020] It includes an upper wheel seat 41, a lower wheel seat 42, and a switching button 43. The upper wheel seat 41 is rotatably mounted on the front wheel base 3 of the electric luggage compartment and is connected to the handle assembly 21 on the front wheel base 3. The handle assembly can control the direction of the upper wheel seat 41, that is, the handle assembly can drive the upper wheel seat 41 to rotate. The lower wheel seat 42 is rotatably mounted on the lower end of the upper wheel seat 41, and the rotation axes of the upper wheel seat 41 and the lower wheel seat 42 are parallel or coaxial, both perpendicular to the horizontal plane. In this embodiment, the rotation axes of the upper wheel seat 41 and the lower wheel seat 42 are coaxial, and a main shaft 44 is provided between them. The front wheel body 46 is eccentrically arranged on the lower wheel seat 42, that is, the rotation axis 48 of the front wheel body 46 is connected to the lower wheel... The rotation axes of seat 42 are located on different planes, with a certain distance between them, so as to achieve horizontal rotation, i.e., deflection, in the omnidirectional wheel state; the switching button 43 is horizontally slidably mounted on the upper wheel seat 41, and at the same time, an elastic component 47 is provided on the upper wheel seat 41. The elastic component 47 is a compression spring, which makes the switching button 43 have an outward movement tendency. The side wall of the switching button 43 is provided with a locking block 433. In this embodiment, the locking block 433 is located at the lower end of the switching button 43. At the same time, a locking groove 4211 is provided on the lower wheel seat 42. The locking groove 4211 can accommodate the locking block 433, thereby realizing the connection between the lower wheel seat 42 and the upper wheel seat 41, so that the upper wheel seat 41 can drive the lower wheel seat 42 to rotate synchronously.

[0021] When the locking block 433 is aligned with the slot 4211, under the force of the elastic component 47, the locking block can be pushed to move and lock into the slot 4211. At this time, the lower wheel seat 42 is connected to the upper wheel seat 41 and can rotate synchronously with the upper wheel seat 41, thereby switching to the directional wheel state.

[0022] When the switch button is pressed, the locking block 433 moves inward and disengages from the locking slot 421. At this time, the lower wheel seat 42 can rotate freely relative to the upper wheel seat 41, thus switching to the universal wheel state.

[0023] It is mounted on the front wheel base 3 of the electric luggage box, which can move back and forth to switch between riding mode and push mode.

[0024] In riding mode, the directional wheel is in a fixed position. The switch button pops outward under the action of the elastic component, and the locking block 433 is locked into the locking groove 4211 of the lower wheel seat, realizing the rigid connection between the upper wheel seat 41 and the lower wheel seat 42. At this time, when the handlebar assembly drives the upper wheel seat to rotate, the lower wheel seat rotates synchronously, and the front wheel body 46 steers precisely with the steering command, without delay or slippage, ensuring steering controllability during riding.

[0025] In push mode, the front wheel base 3 moves backward and resets, bringing the switch button into contact with the box. Pressing the switch button causes the locking block 433 to disengage from the slot 4211, separating the lower wheel base 42 from the upper wheel base 41, allowing it to rotate independently around the main shaft. At this time, the front wheel body rotates freely due to its eccentric design, enabling 360° flexible steering during push without manual adjustment, facilitating easy pushing of the suitcase. The purely mechanical locking method using compression springs, locking blocks, and slots eliminates the need for motors, sensors, or other electronic components, making it unaffected by environmental factors and significantly reducing the failure rate compared to electronically controlled switching structures. Even if the elastic components age, only the spring needs to be replaced to restore functionality, resulting in low manufacturing and maintenance costs. The elastic components keep the switch button in a default pop-out locked state, meaning the front wheel defaults to directional wheel mode. It only unlocks to omnidirectional wheel mode when the telescopic rod moves backward and the button is forcibly pressed by the box, preventing accidental switching from directional to omnidirectional due to bumps or accidental activation during riding, thus improving safety and reliability.

[0026] In order to achieve automatic state switching, in this application, the opening direction of the slot 4211 is perpendicular to the rotation axis of the front wheel body 46, and the slot is located on the side close to the rotation axis of the front wheel body 46. When the omnidirectional wheel rotates into the directional wheel, the omnidirectional wheel deflects backward during its forward movement, thereby enabling the slot and the block to automatically align. The block is inserted into the slot under the action of the elastic component, completing the automatic locking of the directional wheel state. The structure is compact, and mode switching can be achieved without an additional drive mechanism. The structure is simple, with low complexity and manufacturing cost, and good stability in use.

[0027] In this application, an upper wheel seat mounting hole 311 is provided on the bottom surface of the front wheel base 3 to accommodate and install the upper wheel seat 41. The cross-section of the upper wheel seat 41 is circular, and the cross-section of the upper wheel seat mounting hole is also circular. A recessed hole and a shaft hole 3110 are provided on the axis of the upper wheel seat mounting hole 311 to realize the rotatable connection of the upper wheel seat on the front wheel base 3. An opening 313 is provided at the rear end of the upper wheel seat mounting hole 311. The opening can accommodate the switching button 43 to pass through and provide a switching button... Button 43 provides swing space; a limiting protrusion 411 is provided on the top surface or side wall of the upper wheel seat 41, and a limiting groove 312 corresponding to the limiting protrusion 411 is provided on the top surface or side wall of the mounting hole 311 of the upper wheel seat. The limiting groove 312 can accommodate the limiting protrusion 411 and realize rotational limitation of the upper wheel seat 41; in this embodiment, the limiting protrusion is provided on the top surface of the upper wheel seat 41, and it is fan-shaped, so that the turning angle of the upper wheel seat 41 is less than or equal to ±45 degrees. Both the upper wheel seat 41 and the upper wheel seat mounting hole 311 have circular cross-sections. Together with the positioning structure of the concave hole and the shaft hole 3110, they form a precision shaft hole fit, which makes the axis of the upper wheel seat fixed and without eccentric offset when rotating. This avoids steering jamming or play in the directional wheel mode, ensures accurate transmission of steering commands, and improves the installation stability and reliability of the front wheel. The opening 313 accommodates the switching button 43 and provides swing space so that the switching button will not interfere with the front wheel base when the upper wheel seat rotates. It also enables the hidden design of the switching button, improving the overall aesthetics and structural compactness and preventing accidental activation.

[0028] Specifically, an annular receiving groove 4210 is provided on the top surface of the lower wheel seat 42. The annular receiving groove is circular and coaxial with the rotation axis of the lower wheel seat 42. The side wall of the annular receiving groove 4210 extends outward to form a slot 4211. When in the directional wheel state, the locking block 433 is located in the slot 4211; when in the universal wheel state, the locking block 433 is located in the annular receiving groove 4210. The annular receiving groove is coaxial with the rotation axis of the lower wheel seat. When the locking block 433 exits the slot 4211, the locking block falls into the annular receiving groove as a whole. At this time, the lower wheel seat can rotate freely around the main shaft, and the locking block moves synchronously with the lower wheel seat in the annular groove without any mechanical obstruction, ensuring that the front wheel body can smoothly deflect 360° in the universal wheel mode, and the turning radius is close to zero when pushed. Its structure is compact, easy to manufacture, and has high structural strength.

[0029] To improve the rotational stability of the lower wheel seat 42, this application provides an annular protrusion 413 on the bottom surface of the upper wheel seat 41. This annular protrusion can be inserted into the annular receiving groove 4210 and rotate. At the same time, a locking block receiving groove 4130 is provided on the annular protrusion 413. The locking block receiving groove 4130 is used to receive the locking block 433 in the universal wheel state and to support the elastic component. The annular protrusion 413 is inserted into the annular receiving groove 4210 of the lower wheel seat to form a nested structure of shaft and hole, which forces the upper wheel seat and the lower wheel seat to rotate around the same axis, eliminating the eccentric shaking caused by machining errors or assembly gaps. In the universal wheel mode, when the lower wheel seat rotates freely around the main shaft, the cooperation between the annular protrusion and the annular groove is equivalent to a sliding bearing, which restricts radial displacement and avoids the swaying phenomenon caused by the eccentric design of the front wheel body. It can improve the connection reliability and movement smoothness between the lower wheel seat and the upper wheel seat and avoid the shaking or looseness.

[0030] In this embodiment, the outer end face of the locking block 433 is an arc-shaped surface, which serves as the first working surface 433a. The axis of the first working surface 433a is coaxial with the rotation axis of the lower wheel seat 42, while the inner wall of the annular receiving groove 4210 serves as the second working surface. When the switching button 43 disengages from the housing and the first working surface contacts the second working surface, the switching button is released, and the front wheel body rotates to the switching state. At this time, the locking block and the slot are not aligned. When the steering assembly moves, the force generated by the bottom surface on the lower wheel seat 42 is greater than the force generated by the first working surface on the second working surface. At this time, the forward movement of the front wheel can cause the front wheel body to deflect backward, so that the slot can automatically align with the locking block. On the one hand, this can increase the thickness of the locking block within the effective space, improve the connection strength, and on the other hand... On the one hand, as a guide surface for the relative rotation of the card block and the card block receiving groove, the contact area between the two is increased, the force per unit area is reduced, and the wear resistance and structural durability are improved. This allows the switching button to automatically return to center under the action of ground friction when it is disengaged from the housing and the front wheel body is not centered. In order to reduce the friction in this state, that is, the friction between the card block and the annular receiving groove in the elastic component, in this embodiment, the first working surface 433a or the second working surface is made of lubricating material, or a lubricating layer is provided on the surface of the working surface or the second working surface to reduce the friction generated by the relative rotation when the two are in contact, reduce the rotational damping of the front wheel body in the switching state, realize the rapid return of the front wheel body, and thus make the card slot automatically align with the card block to realize the switching to the directional wheel.

[0031] In this application, a strip groove 415 is provided on the bottom surface of the upper wheel seat 41. The length direction of the strip groove 415 is perpendicular to and intersects the axis of the upper wheel seat 41. The strip groove 415 and the lower wheel seat 42 form a sliding groove. The switching button 43 is horizontally slidably fitted in the sliding groove. Therefore, the axis of the switching button 43 is perpendicular to and intersects the rotation axis of the upper wheel seat. The length direction of the strip groove is perpendicular to the rotation axis of the upper wheel seat. It cooperates with the lower wheel seat to form a straight sliding groove, which forces the switching button 43 to slide only in the horizontal direction perpendicular to the rotation axis. This avoids radial offset caused by processing errors or vibration, ensures that the sliding stroke of the switching button corresponds precisely to the axial movement of the locking block 433, and has no stroke play, thus improving the reliability of mode switching. Moreover, the structure is compact and easy to assemble and maintain. A limiting groove 4150 is provided on one or both sides of the strip groove 415, and the lower end of the limiting groove 4150 extends outside the strip groove 415. At the same time, a limiting protrusion 434 corresponding to the limiting groove 4150 is provided on the side wall of the switching button 43. The limiting protrusion has the functions of limiting and guiding, restricting the range of motion of the switching button in the slide groove, preventing it from sliding out or excessive displacement, especially the inward movement stroke. At the same time, it can prevent the switching button from deflecting vertically at both ends when moving horizontally, thus improving the smoothness of sliding.

[0032] The switching button 43 in this embodiment includes a guide block 431. Preferably, the cross-section of the guide block is rectangular. The outer end face of the guide block 431 (facing away from the axis of the lower wheel seat) is provided with a cylindrical body. The cylindrical body is horizontal and basically coaxial with the guide block 431, forming a pressing part 432. Its end is used to contact the housing and trigger. A first limiting surface facing outward is formed between the guide block 431 and the pressing part 432, which is used to limit the outer stroke of the switching button. The lower end of the guide block 431 is provided with a locking block 433. The inner end face of the guide block 431 is provided with a spring hole for installing an elastic component. The spring hole is a blind hole for installing an elastic component, i.e., a compression spring. Its structure is compact, which facilitates the positioning and pre-compression of the spring during assembly, avoids the elastic component from shifting or failing during operation, and ensures that the switching button can be stably reset after being triggered. The width of the locking block 433 is smaller than the width of the guide block 431, forming a downward-facing second limiting surface between them. Essentially, this creates a stepped limiting structure through the difference in structural dimensions, providing the locking block with a hard constraint in the vertical direction and an assembly positioning reference, improving the locking block's positional accuracy in the vertical direction and enhancing operational reliability and stability. In this application, the inner end face of the locking block 433 is flush with the inner end face of the guide block 431, and both are arc-shaped surfaces. The arc-shaped surfaces are coaxial with the rotation axis of the lower wheel seat 42, using a curved contour to adapt to the limited space. This maximizes the pressing depth within the limited installation space, allowing for an increase in the locking block thickness to improve connection strength, while ensuring no interference during movement and no loss in force transmission.

[0033] The following describes the specific installation and use of the caster wheel assembly of this application.

[0034] The electric luggage case includes a case body with a seat on top and a rear wheel at the bottom. A telescopic mechanism is mounted on the case body, including a telescopic rod 13 that slides horizontally and extends and retracts forward and backward, driven by an electric push rod. A front wheel base 3 is located at the front end of the telescopic rod 13, and a swivel wheel assembly is mounted on the front wheel base 3. The upper wheel seat of the swivel wheel assembly is connected to a handlebar assembly for steering while riding.

[0035] The switching button 43 is used to switch the universal wheel assembly between the universal wheel state and the fixed wheel state. During installation, the switching button 43 is set to face backward. When the front wheel base is reset to the rear and the switching button 43 is in contact with the box body, i.e. when pressed, the universal wheel assembly is switched to the universal wheel state. At this time, the suitcase can be pushed. When the front wheel base moves forward and the switching button 43 is disengaged from the box body, the universal wheel assembly is switched to the fixed wheel state. At this time, it can be ridden, and the hand assembly can control the universal wheel assembly to achieve steering.

[0036] It allows the front wheels of the electric luggage case to switch between directional and omnidirectional steering, balancing controllable steering while riding and flexible steering while pushing. The state switching is mechanically linked, requiring no manual intervention. The front wheel state is automatically controlled by moving the telescopic rod forward or backward and by the contact or disengagement of the switching button 43 with the case body. When the button is pressed by the case body, the front wheels switch to omnidirectional wheels, allowing for direct pushing without additional operation. When the button is disengaged from the case body, the front wheels automatically switch to directional wheels, and the handlebar assembly takes over steering, allowing for immediate riding. This eliminates the cumbersome steps of manual mode switching, reduces operational errors, and improves usability. The switching button must be pressed in contact with the case body to activate. Triggering the omnidirectional wheel mode prevents accidental button presses during riding that could cause sudden changes in the front wheel's state. The triggering conditions of the switching mechanism naturally map to the usage scenario; the backward movement during pushing and the forward extension during riding are intuitive and intuitive, allowing for unconscious function switching. The mechanical linkage structure is stable and reliable, requiring no additional power supply or complex control modules, which reduces system failure rates and enhances product durability. The mechanical linkage between the switching button and the forward and backward movement of the telescopic rod 13 eliminates the need for manual mode switching, achieving a seamless switching experience and preventing operational errors such as forgetting to switch or incorrect switching, resulting in a superior user experience.

[0037] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. An electric luggage universal wheel assembly, characterized in that: The device includes an upper wheel seat, a lower wheel seat, and a switching button. The upper wheel seat is rotatably mounted on the front wheel base of an electric luggage compartment. The lower wheel seat is rotatably mounted on the lower end of the upper wheel seat, and its rotation axis is parallel or coaxial with the rotation axis of the upper wheel seat. The front wheel body is eccentrically mounted on the lower wheel seat. The switching button is slidably mounted on the upper wheel seat, and its sliding axis is perpendicular to the rotation axis of the lower wheel seat. The upper wheel seat is provided with an elastic component that gives the switching button an outward movement tendency. The side wall of the switching button is provided with a locking block, and the lower wheel seat is provided with a slot that allows the locking block to be inserted. When the card block aligns with the card slot and is engaged in the card slot under the force of the elastic component, the lower wheel seat is connected to the upper wheel seat and can rotate synchronously with the upper wheel seat, and switches to the directional wheel state; When the switching button is pressed and the card block is disengaged from the card slot, the lower wheel seat can rotate relative to the upper wheel seat and switch to the universal wheel state.

2. The electric luggage universal wheel assembly as described in claim 1, characterized in that: The opening of the slot is perpendicular to the rotation axis of the front wheel body and is located on the side close to the rotation axis of the front wheel body.

3. The electric luggage universal wheel assembly as described in claim 1, characterized in that: The top surface of the lower wheel seat is provided with an annular receiving groove, which is coaxial with the rotation axis of the lower wheel seat. The side wall of the annular receiving groove extends outward to form the locking groove. When the wheel is in the directional wheel state, the locking block is located in the locking groove; when the wheel is in the universal wheel state, the locking block is located in the annular receiving groove.

4. The electric luggage universal wheel assembly as described in claim 3, characterized in that: The bottom surface of the upper wheel seat is provided with an annular protrusion that can be inserted into the annular receiving groove and rotate. The annular protrusion is provided with a block receiving groove, which is used to accommodate the block in the universal wheel state and to support the elastic component.

5. The electric luggage universal wheel assembly as described in claim 3, characterized in that: The outer end face of the card block is an arc-shaped surface and serves as the first working surface. The axis of the first working surface is coaxial with the rotation axis of the lower wheel seat, and the inner wall of the annular receiving groove serves as the second working surface.

6. The electric luggage universal wheel assembly as described in claim 5, characterized in that: The first working surface and / or the second working surface are made of a lubricating material or have a lubricating layer on their surface.

7. The electric luggage universal wheel assembly as described in claim 1, characterized in that: The bottom surface of the upper wheel seat is provided with a strip groove, the length direction of the strip groove is perpendicular to and intersects the axis of the upper wheel seat, and a sliding groove is formed between the strip groove and the lower wheel seat, and the switching button is slidably fitted in the sliding groove; a limiting groove is provided on one or both sides of the strip groove, the lower end of the limiting groove extends outside the strip groove, and a limiting protrusion corresponding to the limiting groove is provided on the side wall of the switching button.

8. The electric luggage universal wheel assembly as described in claim 1, characterized in that: The switching button includes a guide block, the outer end face of which is provided with a cylindrical body and forms a pressing part, and an outward first limiting surface is formed between the guide block and the pressing part; the lower end of the guide block is provided with a locking block, and the inner end face of the guide block is provided with a spring hole for installing an elastic component.

9. The electric luggage universal wheel assembly as described in claim 8, characterized in that: The width of the card block is smaller than the width of the guide block, and a downward-facing second limiting surface is formed between the two.

10. The electric luggage universal wheel assembly as described in claim 8, characterized in that: The inner end face of the card block is flush with the inner end face of the guide block and both are arc-shaped surfaces. The arc-shaped surfaces are coaxial with the rotation axis of the lower wheel seat.

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