Bicycle

Abstract

The invention relates to a bicycle which comprises a bicycle body, a holding part, a seat cushion, a rear wheel, a variable speed unit, two trampling groups and a brake unit; and the bicycle body comprises a box body and a fixed plate. The variable speed unit comprises a plurality of gear sets accommodated in the inner space of the box body, a rear wheel axle assembly positioned between the rear wheel and the box body, a transmission shaft positioned at one end of the box body and an output shaft positioned at the other end of the box body; each of the gear sets is sequentially engaged and connected with the other gear set; the fixed plate is arranged at one end of the transmission shaft in a penetrating manner; the box body and the first gear set are arranged at the other end of the transmission shaft in a penetrating manner; and the output shaft penetrates through the rear wheel, the rear wheel axle assembly, the box body and the last gear set. When a user tramples the trampling groups, power can be transferred to the rear wheel via the variable speed unit and further drives the bicycle to go forward, therefore, the invention provides the bicycle without a chain, and not only are inconvenience in use and safety problems avoided, but also the overall size of the bicycle can also be relatively reduced.

Description

technical field [0001] The invention relates to a bicycle, especially a bicycle whose rear wheel is driven to rotate without a chain. Background technique [0002] Bicycles are not only the most commonly used means of transportation for people, but also a tool that can enjoy the scenery and play around and keep fit. It is a part of leisure and stress relief for modern people. In addition, bicycles can also achieve the effect of reducing carbon emissions and beautifying the earth's environment. Therefore, bicycles are a tool that can achieve transportation, leisure and economical benefits at will. [0003] Existing bicycle usually comprises a pedaling group, a crank group that is arranged between the front wheel and the rear wheel and connects the pedaling group, a flywheel group that is arranged on one side of the rear wheel, and a connecting crank group and the flywheel group. chain. By stepping on the pedaling group, the power can be transmitted to the flywheel group thr...

AI Technical Summary

Problems solved by technology

[0004] However, in existing bicycles, the crank set must be arranged between the front wheel and the rear wheel, and the flywheel set needs to be driven through the chain, thus increasing the overall volume of the bicycle, and further increasing the space occupied by the bicycle for carrying and storing. If the storage space is not enough, you need to dismantle the front wheel, the rear wheel or both at the same time to place it, which will cause troubles in the subsequent assembly

[0005] Furthermore, the chain is likely to loosen or fall off due to continuous advancement during use, causing trouble in use and even doubts in safety, resulting in unbearable use of the bicycle.

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