Automatic transmission for bicycle and transmission system

Abstract

The invention particularly relates to an automatic transmission for a bicycle and a transmission system. The automatic transmission comprises a floating tooth disc and a floating tooth disc driver, wherein the floating tooth disc driver comprises a driving disc, force arms, gear teeth, pin shafts, regulating discs, torsion springs and a guide disc, and the gear teeth are pressed into one ends, close to the driving disc, of strip-shaped through holes by the regulating discs under the action of the torsion springs through the force arms; and the floating tooth disc is mounted between the driving disc and the guide disc and comprises a tooth disc body and an inner tooth ring, teeth arranged on the excircle of the tooth disc body are meshed with a chain on the bicycle, and the inner tooth ring is meshed with a tooth ring formed by the gear teeth on the force arms in the floating tooth disc driver. The transmission system comprises the floating tooth disc, the floating tooth disc driver, a single-chip flywheel, the chain, a rear shaft, a middle shaft, a crankshaft, a pedal and a hub, wherein the flywheel is in matched connection with the floating tooth disc, and the floating tooth disc driver is mounted on the middle shaft through a middle hole. The automatic transmission is simple in structure, convenient to manufacture, low in cost, safe, reliable, excellent in performance and high in transmission efficiency.

Description

technical field [0001] The invention relates to a mechanical transmission type transmission, in particular to an automatic transmission and a transmission system for a bicycle, especially suitable for a chain transmission system. Background technique [0002] At present, the more speed changers used on bicycles are generally divided into two categories: one type of speed changer realizes speed change by changing the cooperation of a group of wheel discs with different diameters and a group of flywheels with different diameters and the chain. This type of transmission has some obvious disadvantages: for example, the structure is relatively complex, and the force direction of the chain is not perpendicular to the axis of the rear axle and the central axle during the shifting process, resulting in large power loss, resulting in fast wear and short life of the chain and chainring. The efficiency is low, and the chain is prone to twisting, frustrating, falling off, or even breaki...

AI Technical Summary

Problems solved by technology

This type of transmission has some obvious disadvantages: for example, the structure is relatively complex, and the force direction of the chain is not perpendicular to the axis of the rear axle and the central axle during the shifting process, resulting in large power loss, resulting in fast wear and short life of the chain and chainring. The efficiency is low, and the chain is prone to twisting, frustrating, falling off, or even breaking

This type of transmission also has some obvious disadvantages: for example, the structure is quite complicated, the manufacturing cost is high, the weight is heavy, the maintenance cost is high, and there is obvious frustration during the shifting process, etc.

Images