Integrally molded composite steering wheels
View Patent ↗A composite steering wheel for an automotive vehicle having a steering column is provided. In an exemplary embodiment, the composite steering wheel includes a rim, a center hub, and a plurality of spokes connecting the rim to the center hub. The rim, the center hub, and the plurality of spokes are formed from a deformable thermoplastic material. The composite steering wheel also includes an attachment member embedded in the center hub. The attachment member is sized to couple to the steering column.
1. A composite steering wheel for an automotive vehicle, the automotive vehicle having a steering column, said composite steering wheel comprising:
a rim;
a center hub;
a plurality of spokes connecting said rim to said center hub, each said spoke comprising a hollow chamber extending through said spoke from said hub at least partially to said rim, each said hollow chamber having an access opening adjacent said center hub;
said rim, said center hub, and said plurality of spokes formed from a deformable thermoplastic material;
an attachment member embedded in said center hub, said attachment member sized to couple to the steering column; and
a vibration damper assembly positioned in each said hollow chamber, said vibration damper assembly comprising an end cap, said end cap closing said access opening.
2. A composite steering wheel in accordance with claim 1 wherein said deformable thermoplastic material is a foamed thermoplastic material.
3. A composite steering wheel in accordance with claim 1 wherein said rim comprises a rim element, said deformable thermoplastic material overmolded around said rim element.
4. A composite steering wheel in accordance with claim 3 wherein said rim element comprises a metal material or a plastic material, said metal material selected from the group consisting of steel, aluminum, and magnesium, said plastic material selected from the group consisting of silicone modified polycarbonates, nylon, polyesters, polyphenylene oxide, polypropylene, and polyurethane.
5. A composite steering wheel in accordance with claim 3 wherein said rim element is solid or tubular and comprises a circular, rectangular, or polygonal cross sectional shape.
6. A composite steering wheel in accordance with claim 1 wherein said deformable thermoplastic material selected from the group consisting of silicone modified polycarbonates, nylon, polyesters, polyphenylene oxide, polypropylene, and foamed thermoplastic materials thereof.
7. A composite steering wheel in accordance with claim 1 wherein said deformable thermoplastic material further comprises a plurality of reinforcing fibers.
8. A composite steering wheel in accordance with claim 1 wherein said thermoplastic material has a 20 percent stress to failure rating as measured by ASTM D638.
9. A composite steering wheel in accordance with claim 1 wherein said vibration damper assembly comprises:
a center rod;
a weight slidably coupled to said center rod;
a first spring positioned over said rod between said weight and a first end of said rod;
a second spring positioned over said rod between said weight and a second end of said rod;
a first end cap coupled to said first end of said rod, said first end cap sized to close said access opening; and
a second end cap coupled to said second end of said rod.
10. A composite steering wheel in accordance with claim 1 wherein said attachment member comprises:
a plate portion;
an attachment portion extending from one side of said plate portion; and
an attachment opening extending through said attachment portion, said attachment opening sized to receive the steering column.