| 摘要 |
<p>A bicycle pedal crank (1) is described, comprising an elongated body (2) extending along a longitudinal axis X-X and having a first end portion (5) comprising a first seat (38) for coupling with a bottom bracket of the bicycle, a second end portion (10) comprising a second seat (39) for coupling with a pedal and an intermediate portion (15) extending between said first end portion (5) and said second end portion (10) and comprising an inner portion (20) substantially without structural strength and a first reinforcement structure. In accordance with the invention, the first reinforcement structure comprises a tubular structure (35) arranged around said inner portion (20) and extending longitudinally for a part not longer than the longitudinal extension of said intermediate portion (15). Such a tubular structure (35), advantageously, ensures uniform structural capabilities around the portion substantially without structural capability. The extension of the tubular element is limited to just the intermediate portion (15) of the pedal crank, that is without involving the end portions (5,10) and the respective coupling seats (38,39), allows the pedal crank (1) to be manufactured in a simple and quick way in a completely automated manner, for example, using a filling material moulded under high pressure. An intermediate product and a method for manufacturing the aforementioned pedal crank are also described.</p> |
