Stepping type no-chain no-middle-shaft infinitely-variable-speed folding bicycle

Abstract

The invention relates to a stepping type no-chain no-middle-axle infinitely-variable-speed folding bicycle. The stepping type no-chain no-middle-axle infinitely-variable-speed folding bicycle is characterized in that a hollow shaft, one-way bearings, gears, crank telescopic rods and the like are used for replacing an middle shaft, cranks, crank discs, a chain, flywheels, a variable speed device and the like of a bicycle in the prior art, and are arranged in composite wheel hubs, and whole close of wheels and shaft transmission parts is formed. According to the stepping type no-chain no-middle-axle infinitely-variable-speed folding bicycle disclosed by the invention, the driving form, the transmission mode, the speed change method, the appearance style and the folding situation of the bicycle throughout history are changed, and common steering of a front wheel and a rear wheel is adopted, namely that the circular pedaling driving type of the bicycle is changed into a stepping type; chain transmission or transmission shaft transmission is changed into gear transmission; the speed change through adjusting gear ratio is changed into the infinitely-variable speed change through extending (or contracting) crank rods; the functions of the middle shaft are achieved by a front shaft concurrently, and the middle shaft manner of the bicycle is omitted; and the front wheel steering is changed into the common steering of the front wheel and the rear wheel, and internal rotation and folding of the front wheel and the rear wheel are realized.

Description

[0001] 1. Patent name: [0002] Step-by-step non-chainless shaft stepless variable speed folding bicycle [0003] 2. Technical field: [0004] The invention relates to a step-type, chainless, central shaft, stepless and foldable bicycle. Variable speed, default center axle, common steering of front and rear wheels, folding in half, etc. [0005] 3. Background technology: [0006] At present, the drive of the bicycle is implemented by the crank at the center shaft of the circular pedal; the transmission is mostly a chain or a drive shaft; the speed change is realized by adjusting the tooth ratio of the crankset and the flywheel; due to the existence of the center shaft, the folded body is larger. There are following deficiencies: [0007] ①For circular pedaling, the angle between the force and the force arm needs to be constantly changed, and the torque in some areas is small and there are dead spots; the conversion efficiency is low and fatigue is easy. It is common for bic...

AI Technical Summary

Problems solved by technology

[0007] ① Circular pedaling, the angle between the force and the force arm needs to be constantly changed, the torque in some areas is small, and there are dead spots; the conversion efficiency is low and fatigue is easy

[0008] ②The crank (foot arm) that rotates around the central axis is affected by the height from the ground and the user's physiology (leg length), and the length design is limited (generally around 180mm). The maximum input torque cannot be obtained by increasing the length of the crank rod

[0009] ③The transmission mechanism has many parts, smoothness and poor convenience; the cost of stepless transmission is high

[0010] ④Chain (or transmission shaft) transmission device, long transmission distance, many components, relatively low reliability, durability, simplicity, conversion efficiency, etc.

[0011] ⑤ Due to the center shaft, the structure of the car body is complicated, and the large wheel diameter is folded, making it difficult to carry

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