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1. (WO2019009910) NON-PNEUMATIC WHEEL HAVING POLYAMIDE SPOKES
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CLAIMS

What is claimed is:

1. A non-pneumatic wheel having a deflection of the outer band in contact patch the under normal loading conditions, the non-pneumatic wheel defining an axis of rotation and defining axial, radial, and circumferential directions, the non-pneumatic wheel comprising:

an outer band, the outer surface of the outer band having a ground contacting surface; a hub; and

a plurality of spokes wherein each spoke is displaced to create pretension in the radial direction under a design load, the displacement equal to or greater than the predetermined deflection of the outer band, wherein the plurality of spokes is made from a polyamide material having a conditioned tensile modulus between 600 MPa and 3000 MPa as determined under ISO-527-2, an equilibrium moisture content of no more than 1.5 % as determined at 23 °C and 50% relative humidity under ISO 62 and a fatigue failure resistance that can withstand at least 1 million cycles as determined under ASTM D7774.

2. The non-pneumatic wheel of claim 1, wherein the plurality of spokes each possess a v-shaped geometry.

3. The non-pneumatic wheel of claim 2, wherein each of the plurality of spoke nests with the adjacent spoke such that the nose of the spoke extends past a vertical line drawn between the connection point of the adjacent spoke with the hub and the connection point of the adjacent spoke with the outer band.

4. The non-pneumatic wheel of any of the above claims, wherein said plurality of spokes have a nearly linear stiffness through displacement to the design loading conditions of the wheel.

5. The non-pneumatic wheel of any of the above claims, wherein the displacement of the spoke is the displacement measured between a neutral state of the spoke and the state where the plurality of spokes are attached to the hub and the outer band with the wheel not subject to a load, wherein the neutral state of the spoke is the shape the spoke assumes when it is detached from the hub and the outer band.

6. The non-pneumatic wheel of any of the above claims, wherein the deflection of the outer band is a measurement of the difference between a first length between the axis of rotation of the wheel and a point on outer band in an unloaded state and a second length between the axis of rotation of the wheel and the point on outer band in a loaded state, such measurement measured at a contact patch midpoint.

7. The non-pneumatic wheel of any of the above claims, wherein each of the plurality of spokes has a circumferential length in a neutral state that is at least 75 percent of a neutral height of the spoke.

8. The non-pneumatic wheel of claim 8, wherein the circumferential length of each of the plurality of spokes has the circumferential length in a tensioned state that is at least 25 percent of that of a tensioned height of the spoke.

9. The non-pneumatic wheel of any of the above claims, wherein each spoke is displaced to create a pretension, the displacement equal to or greater than a deflection of the outer band of the wheel that occurs in the contact patch when loaded under normal operating conditions.

10. The non-pneumatic wheel of claim 9, any of the above claims, wherein the spokes having a v-shaped geometry such that each spoke has a nearly linear stiffness when deflected radially over a distance approximately equal to the vertical deflection of the wheel.

11. The non-pneumatic wheel of any of the above claims, wherein the conditioned tensile modulus of the polyamide material is between 1000 MPa and 2000 MPa.

12. The non-pneumatic wheel of any of the above claims, wherein the fatigue failure resistance of the polyamide material can withstand at least 8 million cycles.

13. The non-pneumatic wheel of any of the above claims, wherein a density of the polyamide material is not more than 1.10 g/cm as determined under IS) 1183 at 23 °C.

14. The non-pneumatic wheel of any of the above claims, wherein the polyamide is selected from the group consisting of a PA 12, a PA 11, a PA 612 and combinations thereof.