| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a crank arm having a resistance to breaking and having a hollow end area without points of stress concentration. <P>SOLUTION: The bicycle crank arm having an elongated body extending along a longitudinal axis X-X comprises in which an intermediate portion comprises (a) an inner portion without a structural strength, (b) a first reinforcement structure, and (c) a second reinforcement structure facing the inner portion and the first reinforcement structure and comprising at least one bundle of structural fibers having at least in part a first orientation. The intermediate portion has a section perpendicular to the longitudinal axis X-X in which the inner portion occupies a space defined by a first area having a first surface extension and by a second area having a second surface extension and in which the second reinforcement structure occupies a space having a surface extension equal to the difference between the first and second areas. <P>COPYRIGHT: (C)2007,JPO&INPIT</p> |
