B-5 Bicycle Running Test for a Long Term of Chain Sprocket Manufactured from Carbon Fibber Bundle Reinforced Plastic

Abstract

It ran 2920km making the chain sprocket for the bicycle for trial purposes with 3K carbon fiber bunch and being include the public road in ten months of three years at rain. The chain made of the carbon fiber bundle reinforced plastic sprocket, the addendum was not a loss and was worn out. The measurement of the consumption calorie measurement and the pedal output became possible by installing the heart beat meter and the pedal power meter in cycle computer with the GPS function. It made comparative study with extra super-duralumin A7075 sprocket for the performance evaluation of the CFRP sprocket. The pedal rotation output increased by an increase of the average speed on a smooth road, the average speed exceeded, the pedal rotation output of CFRP exceeded that of A7075 at 10 km/h or more, and the pedal rotation output of the CFRP sprocket was 50% increase in 25 km/h of it of A7075. The pedal output increased by an increase of the average speed in the CFRP sprocket and the A7075 sprocket on non-pavement road and the difference was not seen by both. The CFRP sprocket was a constant pedal output in the climbing up the slope examination of 9% inclination regardless of the average speed. However, a pedal output high for the average speed to decrease in the A7075 sprocket was needed. The CFRP sprocket is suitable for climbing up the slope.