Folding bicycle

Abstract

The invention discloses a folding bicycle, comprising a seat tube, a rear frame, a bottom bracket, a bottom bracket fixture and a bottom bracket fixing link; the bottom bracket fixture is fixedly connected to the seat tube; the bottom bracket is rotationally connected to the bottom bracket fixture through the bottom bracket fixing link and may rotate in a set range relative to the bottom bracket fixture; the rear frame is rotationally connected to the bottom bracket, the rotational center of the rear frame overlaps with the axis of the bottom bracket, and the rear frame may rotate in a set range relative to the bottom bracket. Since the rear frame in the folding bicycle according to the technical scheme is rotationally connected to the bottom bracket, with the rotational center overlapping with the axis of the bottom bracket, a chain is never loosened during folding so that folding is facilitated; in addition, the bottom bracket is rotationally connected to the bottom bracket fixture through the bottom bracket fixing link, the bottom bracket is rotated to the rear of the vertical tube first during folding, a rear wheel may be little back after folding, and the front-rear size of the bicycle folded may be smaller.

Description

technical field [0001] The invention relates to the technical field of bicycles, in particular to a folding bicycle. Background technique [0002] A folding bicycle (folding bicycle) belongs to a category of bicycles, which can be folded when not in use to reduce the volume. Existing folding bicycles have multiple folding methods, and even bicycles of different brands and models using the same folding method have different volume reduction ratios after being folded. Moreover, most of the folding bicycles do not need external tools during the folding process, and the bicycles can be folded and unfolded manually. Such as a common folding bicycle, which folds the front and rear wheels together by folding the frame, which can reduce the length by about 45%. Folding bicycles can be conveniently put into the trunk of a car after being folded, and some folding bicycles can even be put into a boarding case or a folding bag. [0003] Through years of development, folding bicycles ...

AI Technical Summary

Problems solved by technology

[0003] Through years of development, folding bicycles have the characteristics of portability, ease of use, comfort, and mature production technology. However, the development of technology is endless and requires continuous exploration and improvement.

For example, there is an existing folding bicycle, which can make the rear triangle rotate relative to the frame to realize the folding of the rear wheel set, but because the center of rotation during the folding process is inconsistent with the axis of the central shaft, the chain will be caused to collapse during the folding process. For this reason, additional chain tensioning mechanism is required to ensure that the chain will not loosen when folding

This will not only lead to a more complicated structure of the whole vehicle and an increase in cost, but it is also inconvenient to fold, so further improvements are needed

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