Automatic transmission of bicycle

Abstract

An automatic transmission of a bicycle comprises an outer wheel shell, a left end cover, a right end cover and a main shaft. The main shaft penetrates out of the left end cover and the right end cover and is provided with a duplicate center gear and a single center gear. A cross-shaped shaft sleeve is installed in the position, outside the left end cover, on the left of the main shaft, and a chain wheel is installed on the cross-shaped shaft sleeve in a sleeved mode. A first-gear inner gear ring, a second-gear inner gear ring and a third-gear inner gear ring are installed in the outer wheel shell respectively. The second-gear inner gear ring and the third-gear inner gear ring are provided with outer ratchets respectively. The first-gear inner gear ring is inserted in the cross-shaped shaft sleeve. The portions, at the two ends of the duplicate center gear, of the main shaft are sleeved with a front blocking piece and a rear blocking piece through bearings respectively. A disk planetary gear carrier is installed between the front blocking piece and the rear blocking piece. A plurality of first cylindrical pins are installed on the disk planetary gear carrier, and a first-gear planetary gear set is installed on the front portions, corresponding to the first-gear inner gear ring, of the multiple first cylindrical pins. Compared with the prior art, the automatic transmission of the bicycle has the advantages that the automatic transmission is simple in structure, flexible in speed change operation, convenient to maintain and the like, and parts are not prone to damage.

Description

technical field [0001] The invention relates to a transmission device, in particular to an automatic transmission for a bicycle. Background technique [0002] my country is a big bicycle country. Due to its large population, the number of bicycles is particularly large, and bicycles are also exported to many countries. Using bicycles as a means of transportation not only saves energy, does not cause environmental pollution, but also occupies a small area, is flexible and convenient to store, especially cheap, and is suitable for ordinary people's consumption. Frequent cycling is beneficial to people's health. It can be seen that there is still a lot of room for development of bicycles as a means of transportation. But also there are some deficiencies in existing bicycles that use, the bicycle structure of traditional chain drive is simple, and cost is low, but can not change speed, so ride a bicycle more laboriously. In order to solve the problem of speed change, many spee...

AI Technical Summary

Problems solved by technology

But also there are some deficiencies in the existing bicycles used, the traditional chain-driven bicycles are simple in structure and low in cost, but cannot change speed, so it is more laborious to ride a bicycle

In order to solve the problem of speed change, many speed-change bicycles have appeared on the market now. Basically, the speed is changed by engaging flywheels with different numbers of teeth. It cannot automatically speed up and slow down, and the parts are easily damaged and difficult to maintain

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