OMNIDIRECTIONAL WHEEL AND MOVABLE DEVICE
An omnidirectional wheel includes a hub, a number of wheels, and a number of rubber covers. The hub defines a shaft hole passing through the hub. Each of the wheels is rotationally mounted on the hub and spaced around the shaft hole. Each of the rubber covers is sleeved on a corresponding one of the wheels and includes a three-dimensional pattern. The rubber covers prevent the hub from directly contacting the ground.
1 . An omnidirectional wheel comprising:
a hub defining a shaft hole passing through the hub;
a plurality of wheels each rotationally mounted on the hub and spaced around the shaft hole; and
a plurality of rubber covers each sleeved on a corresponding one of the plurality of wheels and comprising a three-dimensional pattern; wherein:
the rubber covers prevent the hub from directly contacting the ground.
2 . The omnidirectional wheel of claim 1 , wherein:
the plurality of wheels forms two rings of wheels around the shaft hole;
each ring of wheels comprises a plurality of wheels, and the plurality of wheels in each ring is spaced at intervals around the shaft hole.
3 . The omnidirectional wheel of claim 2 , wherein:
the wheels in the two rings of wheels are offset around a periphery of the hub.
4 . The omnidirectional wheel of claim 3 , wherein:
a number of the wheels in each of the two rings of wheels is equal.
5 . The omnidirectional wheel of claim 2 , wherein:
the hub comprises a plurality of hub protrusions that protrude outward and are spaced apart around the shaft hole;
the plurality of hub protrusions is formed as two rings around the shaft hole, and one wheel is rotationally mounted between two adjacent hub protrusions in the same ring;
a thickness of the rubber cover is set to prevent the hub protrusions from directly contacting the ground.
6 . The omnidirectional wheel of claim 5 , wherein:
the hub protrusions in both rings are offset from each other along a circumference of the hub; and
each hub protrusion of one ring directly faces one wheel mounted between two hub protrusions of the other ring.
7 . The omnidirectional wheel of claim 5 , wherein:
the hub comprises a first side portion, a middle portion, and a second side portion that are sequentially coupled along an extending direction of the shaft hole;
the first side portion, the middle portion, and the second side portion are all provided with through holes;
the through holes of the first side portion, the middle portion, and the second side portion cooperatively form the shaft hole;
the first side portion cooperates with the middle portion to form a first ring of hub protrusions for mounting one ring of wheels, and the second side portion cooperates with the middle portion to form a second ring of hub protrusion for mounting a second ring of wheels.
8 . The omnidirectional wheel of claim 5 , wherein:
each wheel comprises a main portion and rotating shafts protruding from opposite ends of the main portion;
each of the hub protrusions defines a mounting hole in each surface facing an adjacent hub protrusion of the same ring; and
the rotating shafts are rotationally received in the mounting holes of two adjacent hub protrusions of the same ring.
9 . The omnidirectional wheel of claim 8 , wherein:
a cross-sectional diameter of the main portion gradually decreases from a middle of the main portion to the rotating shafts; and
a shape of the rubber cover matches an outer contour of the main portion to cover the main portion.
10 . A movable device comprising:
a body; and
a plurality of omnidirectional wheels, the omnidirectional wheel comprising:
a hub defining a shaft hole passing through the hub;
a plurality of wheels each rotationally mounted on the hub and spaced around the shaft hole; and
a plurality of rubber covers each sleeved on a corresponding one of the plurality of wheels and comprising a three-dimensional pattern; wherein:
the rubber covers prevent the hub from directly contacting the ground.
11 . The movable device of claim 10 , wherein:
the plurality of wheels forms two rings of wheels around the shaft hole;
each ring of wheels comprises a plurality of wheels, and the plurality of wheels in each ring is spaced at intervals around the shaft hole.
12 . The movable device of claim 11 , wherein:
the wheels in the two rings of wheels are offset around a periphery of the hub.
13 . The movable device of claim 12 , wherein:
a number of the wheels in each of the two rings of wheels is equal.
14 . The movable device of claim 11 , wherein:
the hub comprises a plurality of hub protrusions that protrude outward and are spaced apart around the shaft hole;
the plurality of hub protrusions is formed as two rings around the shaft hole, and one wheel is rotationally mounted between two adjacent hub protrusions in the same ring;
a thickness of the rubber cover is set to prevent the hub protrusions from directly contacting the ground.
15 . The movable device of claim 14 , wherein:
the hub protrusions in both rings are offset from each other along a circumference of the hub; and
each hub protrusion of one ring directly faces one wheel mounted between two hub protrusions of the other ring.
16 . The movable device of claim 14 , wherein:
the hub comprises a first side portion, a middle portion, and a second side portion that are sequentially coupled along an extending direction of the shaft hole;
the first side portion, the middle portion, and the second side portion are all provided with through holes;
the through holes of the first side portion, the middle portion, and the second side portion cooperatively form the shaft hole;
the first side portion cooperates with the middle portion to form a first ring of hub protrusions for mounting one ring of wheels, and the second side portion cooperates with the middle portion to form a second ring of hub protrusion for mounting a second ring of wheels.
17 . The movable device of claim 14 , wherein:
each wheel comprises a main portion and rotating shafts protruding from opposite ends of the main portion;
each of the hub protrusions defines a mounting hole in each surface facing an adjacent hub protrusion of the same ring; and
the rotating shafts are rotationally received in the mounting holes of two adjacent hub protrusions of the same ring.
18 . The movable device of claim 17 , wherein:
a cross-sectional diameter of the main portion gradually decreases from a middle of the main portion to the rotating shafts; and
a shape of the rubber cover matches an outer contour of the main portion to cover the main portion.