A crank-type bicycle with two gears

Abstract

A crank-type bicycle with two gears is provided and includes a crankshaft device and a bicycle frame, wherein the crankshaft device is mounted on the bicycle frame, the crankshaft is provided with a gear wheel and a sprocket on the left and right sides, the left and right rear flywheels are linked through the left and right sprockets and chains, the crankshaft left gear links the rear gear, and the rear gear is a two-body gear. At both end of that two-body gear shaft, screws and nut are fixed to the bracket. A spring is mounted at one end of that rear gear shaft, and two-body gears are mountedat the other end. Bearings are installed inside that two-body gears, can slide on the gear shaft, and can shift and return gears through the spring. The two-body gear shaft is a hollow shaft, a nail-shaped tie rod is installed inside, a lever and a hose are connected, and that other end of the hose is connected to the handlebar, and the shift position can be changed when necessary, the bicycle rider can move forward with both feet whether forward or backward, the bicycle rides in neutral gear freely, and the bicycle rides like an ordinary bicycle, so that the bicycle is simple and reasonablein structure, and the bicycle rider can save more labor.

Description

technical field [0001] The invention relates to a bicycle, in particular to a bell crank type double-gear bicycle. Background technique [0002] Bicycles, also known as bicycles or bicycles, are usually small road vehicles with two wheels; after people get on the vehicle, they are powered by pedals and are green and environmentally friendly means of transportation. [0003] At present, there are many improvements on bicycles, such as power-assisted steering bicycles, and labor-saving bicycles that use double-chain transmission; however, almost all bicycles on the market are chain-driven. When the pedals are stepped forward, the bicycle moves forward; When pedaling, the bicycle wheel spins idly, and the bicycle cannot move backwards when it moves clockwise; therefore, during long-term riding, especially when going uphill, the rider needs to keep pedaling forward for a long time, which is likely to cause muscle fatigue. Physical exhaustion and other situations, and as the rid...

AI Technical Summary

Problems solved by technology

[0003] At present, there are many improvements on bicycles, such as power-assisted steering bicycles, and labor-saving bicycles that use double-chain transmission; however, almost all bicycles on the market are chain-driven. When the pedals are stepped forward, the bicycle moves forward; When pedaling, the bicycle wheel spins idly, and the bicycle cannot move backwards when it moves clockwise; therefore, during long-term riding, especially when going uphill, the rider needs to keep pedaling forward for a long time, which is likely to cause muscle fatigue. Physical exhaustion and other situations, and as the rider gradually loses strength, the bicycle may also fall backwards, that is, fall from the hillside, which is very dangerous

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