The invention relates to a wheel ( 1 ) with a driven wheel body ( 2 ), comprising two support elements ( 21, 22 ), between which a number of roller bodies ( 3 ) with a spherical surface are arrange to rotate, which at least partly extend beyond the circumference of the support elements ( 21, 22 ) the rotational axes of which are arranged at an angle to the rotational axis ( 23 ) of the wheel body ( 2 ). The ratio of the outer diameter (Du) of the wheel ( 1 ) to the maximum radius (Ra) of the roller body ( 3 ) is between 1.08 and 1.13, in particular, between 1.09 and 1.12.
1. A wheel having a circular profile with an outer diameter, the wheel comprising:
a wheel body including first and second oppositely disposed support members, said wheel body having a rotational axis; and
a plurality of rolling elements coupled to said wheel body and extending between said first and second support members, each said rolling element comprising an elliptical carrier body and a smooth, homogenous polymeric coating on said elliptical carrier body, said polymeric coating having a constant thickness along a lengthwise direction of said elliptical carrier body;
each said rolling element having a rolling axis inclined obliquely to said rotational axis of said wheel body and having an outer rolling surface with an arcuate profile in a section plane through and aligned with said rolling axis, said arcuate profile defined by a maximum radius;
wherein a ratio of the outer diameter of the wheel to said maximum radius is approximately 1.08 to approximately 1.13.
2. The wheel of claim 1 , wherein said ratio of the outer diameter of the wheel to said maximum radius is approximately 1.09 to approximately 1.12.
3. The wheel of claim 1 , wherein said ratio of the outer diameter of the wheel to said maximum radius is approximately 1.10 to approximately 1.11.
4. The wheel of claim 1 , wherein said ratio of the outer diameter of the wheel to said maximum radius is approximately 1.107.
5. The wheel of claim 1 , wherein said polymeric coating comprises polyurethane.
6. The wheel of claim 1 , wherein each said rolling axis of said rolling elements is inclined at an angle of approximately 45 degrees to said rotational axis of said wheel body.
7. The wheel of claim 1 , wherein said maximum radius is constant along said entire rolling surface.
8. The wheel of claim 1 , comprising nine rolling elements coupled to said wheel body and spaced evenly around said wheel body.
9. The wheel of claim 1 , wherein said rolling elements are driven.