Multi-speed transmission system on bicycle

Abstract

The invention discloses a multi-speed transmission system on a bicycle, which comprises a main frame, a first telescopic lower frame, a second telescopic lower frame, a wheel assembly, a boosting assembly, a pedal assembly and a transmission assembly, one end of the main frame is provided with a handlebar, and the other end of the main frame is provided with a rear seat; the second telescopic lower frame is movably inserted into the end, close to the handlebar, of the main frame in a penetrating mode. The system has the advantages that a transmission rod and a connecting structure are used for replacing chain transmission, riding is achieved, multi-stage speed changing can be conducted, the stability of multi-stage speed changing is guaranteed, when a short slope or an uneven road surface is met, the vehicle can be boosted through the weight of the main frame and the weight of a rider, and the physical strength of the rider is saved. The height of the pedals can be adjusted to adjust the height of the pedals in real time according to the leg length of a rider so as to adjust the pedaling strength, the segmented tires are used, the whole tires do not need to be replaced when the tires are replaced, damping can be conducted from the tires and the whole bicycle, and the riding comfort is improved.

Description

technical field [0001] The invention belongs to the field of bicycles, in particular to a multi-stage variable speed transmission system on a bicycle. Background technique [0002] A bicycle, also known as a bicycle or bicycle, is usually a small land vehicle with two wheels. After a person rides on the car, it is powered by pedals, which is a green and environmentally friendly means of transportation. There are many types of bicycles, including single bicycles, tandem bicycles, and multi-person bicycles. Bicycles can be used as an environmentally friendly means of transportation for transportation and travel; more and more people use bicycles as fitness equipment for cycling and exercising; Bicycle itself is also a competitive sport, including road bike race, mountain bike race, track bike race, stunt bike race, etc.; among the 25 parts of the bicycle frame, tires, pedals, brakes, chains, etc., the basic parts are missing. One must. Among them, the frame is the skeleton ...

AI Technical Summary

Problems solved by technology

[0003] Most of the current bicycles are driven by chains, which can achieve the purpose of multi-stage speed change, but the chains are easy to break and fall out of the sprockets when used for a long time, which is very inconvenient to use. Some manufacturers also use gears, transmission rods, etc. instead of chains for transmission. However, the transmission mode of such structures as gears and transmission rods is not convenient for multi-stage speed change, and its transmission speed ratio is fixed and cannot be selected according to road conditions. Therefore, existing bicycles cannot simultaneously perform multi-stage transmission when replacing chains for stable transmission. variable speed

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