Upon the Ordination of the Gear Ratios in the Bicycle Chain Gearing
Journal Title: RECENT - Year 2010, Vol 11, Issue 29
Abstract
Chain gears used for bicycles may be simple, which achieve a single gear ratio, or complex, in which the gear ratio takes several discreet values. Through regulating the gear ratio, the bicycle advancement speed is in fact regulated, in order to make it adequate to the bicyclist’s desire, the road conditions and the power developed at the pedal shaft by the bicyclist. Different bicyclists have different objectives: some of them aim at performance, others use the bicycle for relaxation, and others simply get out of place. Consequently, the maximal value of the power that the bicyclist is able or is willing to develop at the pedal shaft is different from case to case. Therefore, the bicycle gears must be personalized. The paper herein describes the range of speeds likely of being achieved with a bicycle and emphasizes, if there was still the case, that the optimal ordination of the gear ratios must be performed in geometric series. There is shown that the currently used gears in bicycles do not observe this requirement, there is offered a solution for the teeth number of the chain wheels, which sufficiently solves the correct ordination of the gear ratios and there is specified that researches are justified for conceiving and achieving a gear with self-regulating rotational speed.
Authors and Affiliations
Romeo CIOARĂ, Ovidiu SÎRBU
Keywords
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