Bicycle micro gearbox shift bracket

Abstract

The invention provides a miniature gearbox gear shifting support for a bicycle and relates to an intermediate shaft transmission of the bicycle. The gear shifting support for the bicycle is composed of a rack, a second-gear shifting fork, a third-gear shifting fork, a spring seat board, a fourth-gear shifting fork, cantilever springs, a first-gear shifting fork, shifting fork pressing boards and screws. The fourth-gear shifting fork and the third-gear shifting fork are arranged in a rectangular frame arranged on the front side of the left end of a top board of the rack. The second-gear shifting fork and the first-gear shifting fork are arranged in a rectangular frame arranged on the rear side of the right end of the top board of the rack. Shifting fork swinging supporting arms on the shifting forks are placed in shifting fork supports which are covered with the shifting fork pressing boards and the spring seat board. The spring seat board is provided with the four cantilever springs, and the cantilever end of each cantilever spring is connected with an upper shifting fork supporting arm of the corresponding shifting fork. The gear shifting support has the beneficial effects of being unique and ingenious in design, reasonable in structure, good in use effect, stable in gear shifting, long in service life and beneficial to achievement of a miniature gearbox for the bicycle.

Description

technical field [0001] The invention relates to a central shaft transmission of a bicycle, and more particularly relates to a shift bracket of a bicycle miniature transmission in the central shaft transmission. Background technique [0002] At present, the speed regulation of bicycles mostly adopts different pairs of chain discs on the center shaft and chainrings on the rear axle for speed regulation. The transmission speed ratio range is small, and the transmission speed ratio range is generally between 1:1 and 1:4. In order to improve the speed change effect of the bicycle, I have invented some patents for the central shaft transmission of bicycles, such as, the title is "Bicycle with Micro Box Transmission on the Central Shaft", the patent number is ZL201010518569.9, and the patent application date is October 25, 2010 date; the name is "Bicycle Miniature Box-type Transmission", the patent number is ZL201010518578.8, and the patent application date is October 25, 2010; the...

AI Technical Summary

Problems solved by technology

In order to improve the speed change effect of the bicycle, I have invented some patents for the central shaft transmission of bicycles, such as, the title is "Bicycle with Micro Box Transmission on the Central Shaft", the patent number is ZL201010518569.9, and the patent application date is October 25, 2010 date; the name is "Bicycle Miniature Box-type Transmission", the patent number is ZL201010518578.8, and the patent application date is October 25, 2010; these inventions have expanded the range of bicycle transmission, but found in production and use that the original Some bicycle micro-gearbox shifting brackets have unreasonable structure, poor use effect, unstable shifting, and short service life. For this reason, a new bicycle micro-gearbox shifting bracket needs to be explored.

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