Bicycle transmissions

8th International Conference on Advanced Concepts in Mechanical Engineering

Levarda, E.^1

Mechanical Engineering, Mechatronics and Robotics Department, Gheorghe Asachi Technical University of Iasi, Iasi, Romania^1

关键词: Actuation mechanism;    Drive mechanism;    Know-that;    Rotational movement;    Rough terrains;    Torque moments;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/444/5/052013/pdf
DOI  :  10.1088/1757-899X/444/5/052013

来源: IOP

【 摘 要 】

Nowadays the bicycle is considered both a means of transport and recreation. In order to improve bicycle performance, various drive mechanisms have been proposed. In the present paper these mechanisms are presented and analyzed. Bikes have undergone periodic transformations since the first model called the "Celerifer" made in 1790 to the present day where the drive mechanisms have been modified and made of different materials. For the movement of the bicycle, different types of actuation mechanisms have been used since the early years of the apparatus and the use of the bicycle. The most widely used and known transmission is chain transmission that is widely distributed, found to be used in almost all types of bicycles . It is also important to know that we also use gears and cardan shafts. The classic, pedal and chain drive mechanism has the disadvantage of providing an inconstant torque moment to the engine wheel. This disadvantage is particularly noticeable when climbing the slopes or walking on rough terrain. In the paper are presented and analyzed mechanisms that can reduce this disadvantage. There are patented mechanisms, capable of providing a moment of cavity-constant torsion to the wheel. For their action, the movement of the legs is a natural one, close to that of walking, compared to the rotational movement made by the legs for the action of the classic mechanism.All of these changes in drive mechanisms lead to increased bicycle performance.