Composite fiber bicycle wheels
Carbon fiber bicycle wheels are formed from parts cut from carbon fiber cloth and then joined together to form a rim, sidewalls, spokes, flanges and a center tunnel on which the flanges are mounted. The parts are then assembled, bonded together, and cured to form a wheel. During assembly, the spokes and the wheel are placed in tension by moving the flanges outwardly on the center tunnel after assembly and then bonding them in place to stiffen and strengthen the wheel. The spokes of the drive side of the rear wheel are specially shaped to accommodate torque transfer forces generated by pedaling.
1. A carbon fiber bicycle wheel comprising:
a rim having a center channel and first and second sides;
first and second sidewalls bonded to the first and second sides of the rim;
a plurality of flat spokes bonded to each of the sidewalls and extending inwardly toward first and second flanges, the flanges being laterally spaced from each other;
the first and second flanges having at least one portion extending radially outward, the spokes bonded to the at least one portion,
wherein the first flange is formed to include a laterally extending tube on which the second flame is laterally moveably mounted during construction such that tension in the spokes is created by moving the second flange laterally outward along the laterally extending tube, the tension in the spokes being maintained by bonding the second flange in place on the laterally extending tube.
2. The bicycle wheel of claim 1 , wherein fibers of woven carbon fiber cloth run lengthwise along the spokes to carry tension loads from the flanges to the sidewalls.
3. The bicycle wheel of claim 1 , wherein the first and second sidewalls are formed from pattern shapes of carbon fiber cloth;
arcuate segments of the pattern shapes partially overlapping each other to form a circular sidewall.
4. The bicycle wheel of claim 3 , wherein the sidewalls are formed of layers of the arcuate segments, the layers being circumferentially offset with respect to each other.
5. A method of making a bicycle wheel comprising the steps of:
selecting a piece of woven carbon fiber cloth;
cutting pattern shapes from the cloth;
laying up the pattern shapes to form bicycle wheel parts including a rim, a pair of sidewalls, a first flange and a second flange, and a plurality of spokes;
curing the laid up bicycle wheel parts;
bonding the cured parts together with adhesive to form a wheel and curing the bonded parts;
joining the flanges in laterally spaced relation; and
moving the flanges laterally apart to create tension in the spokes; and
bonding the flanges to maintain the tension in the spokes,
wherein:
joining the flanges in laterally spaced relation includes temporarily mounting the second flange on a laterally extending tube formed as part of the first flange;
moving the flanges laterally apart to create tension in the spokes includes moving the second flange laterally outward on the laterally extending tube to create tension in the spokes; and
bonding the flanges to maintain the tension in the spokes includes bonding the second flange in place on the laterally extending tube to maintain the tension in the spokes.
6. The method of claim 5 , wherein cutting pattern shapes from the cloth includes cutting the pattern shapes such that fibers of the woven carbon fiber cloth run lengthwise along the spokes to carry tension loads from the flanges to the sidewalls.
7. The method of claim 5 , where cutting and laying up the pattern shapes to form a sidewall includes cutting arcuate segments and laying the segments end to end such that their ends overlap.
8. The method of claim 5 , wherein the sidewall is formed of layers of the arcuate segments, the layers being circumferentially offset with respect to each other.