Hubless wheel and related stroller

1. A hubless wheel applied to a stroller, the hubless wheel comprising:

a rim whereon a tire is disposed, having an external sliding structure on an inner surface of the rim;

an internal sliding structure disposed inside the external sliding structure; and

at least one bridging component disposed between the external sliding structure and the internal sliding structure, wherein the bridging component is a bearing assembly connected to a frame of the stroller, the bearing assembly comprises:

a plurality of shafts rotatably disposed on an inner surface and an outer surface of the internal sliding structure; and

a fixing component disposed on the plurality of shafts to fix relative position of the shafts.

2. The hubless wheel of claim 1 , wherein the external sliding structure and the internal sliding structure are annular structures contoured to fit the rim.

3. The hubless wheel of claim 1 , wherein a radius of the external sliding structure is substantially equal to an amount of a radius of the internal sliding structure and a diameter of the bridging component.

4. The hubless wheel of claim 1 , further comprising:

a cover disposed on the bridging component and mantling over the external sliding structure and the internal sliding structure.

5. The hubless wheel of claim 1 , wherein the hubless wheel further comprises a plurality of bridging components separately disposed between the external sliding structure and the internal sliding structure, a mounting junction of the hubless wheel and a frame of the stroller is disposed over the corresponding bridging component and corresponding position of the internal sliding structure to adjust a height of the mounting junction relative to the ground whereon the stroller is located.

6. The hubless wheel of claim 1 , wherein the bridging component is a contoured roller, the internal sliding structure is connected to a frame of the stroller, the contoured roller comprises a first engaging portion, the external sliding structure comprises a second engaging portion, the internal sliding structure comprises a third engaging portion, the second engaging portion and the third engaging portion are simultaneously engaged with opposite sides of the first engaging portion.

7. The hubless wheel of claim 6 , wherein the first engaging portion is a concave, and the second engaging portion and the third engaging portion respectively are protrusions matched with the concave.

8. The hubless wheel of claim 1 , wherein the internal sliding structure is a T-shaped track integrated with the external sliding structure monolithically, and an upper part of the T-shaped track is buckled by the shafts.

9. The hubless wheel of claim 1 , further comprising:

an electric generator disposed on the bridging component to create electric power when the hubless wheel moves.

10. A stroller for a child, the stroller comprising:

a frame whereon a seat is disposed; and

a plurality of hubless wheels disposed on the frame, each hubless wheel comprises:

a rim having an external sliding structure on an inner surface, a tire being disposed on an outer surface of the rim;

an internal sliding structure disposed inside the external sliding structure; and

at least one bridging component disposed between the external sliding structure and the internal sliding structure, wherein the bridging component is a bearing assembly connected to a frame of the stroller, the bearing assembly comprises:

a plurality of shafts rotatable disposed on an inner surface and an outer surface of the internal sliding structure; and

a fixing component disposed on the plurality of shafts to fix relative position of the shafts.

11. The stroller of claim 10 , wherein the external sliding structure and the internal sliding structure are annular structures contoured to fit the rim.

12. The stroller of claim 10 , wherein a radius of the external sliding structure is substantially equal to an amount of a radius of the internal sliding structure and a diameter of the bridging component.

13. The stroller of claim 10 , wherein the hubless wheel comprises:

a cover disposed on the bridging component and mantling over the external sliding structure and the internal sliding structure.

14. The stroller of claim 10 , wherein the hubless wheel further comprises a plurality of bridging components separately disposed between the external sliding structure and the internal sliding structure, a mounting junction of the hubless wheel and a frame of the stroller is disposed over the corresponding bridging component and corresponding position of the internal sliding structure to adjust a height of the mounting junction relative to the ground whereon the stroller is located.

15. The stroller of claim 10 , wherein the bridging component is a contoured roller, the internal sliding structure is connected to a frame of the stroller, the contoured roller comprises a first engaging portion, the external sliding structure comprises a second engaging portion, the internal sliding structure comprises a third engaging portion, the second engaging portion and the third engaging portion are simultaneously engaged with opposite sides of the first engaging portion.

16. The stroller of claim 15 , wherein the first engaging portion is a concave, and the second engaging portion and the third engaging portion respectively are protrusions matched with the concave.

17. The stroller of claim 10 , wherein the internal sliding structure is a T-shaped track integrated with the external sliding structure monolithically, and an upper part of the T-shaped track is buckled by the shafts.

18. The stroller of claim 10 , wherein the hubless wheel comprises:

an electric generator disposed on the bridging component to create electric power when the hubless wheel moves.