Half-containing type symmetric folding bike

Abstract

The invention provides a half-containing type symmetric folding bike. The symmetric folding bike comprises a front frame, a front fork, a front wheel, a rear frame, a rear fork, a rear wheel, a bike head, a saddle, pedestals, a crank and a transmission device; the front wheel is mounted on the front fork, the rear wheel is mounted on the rear fork, the bike head is mounted on the front frame, andthe saddle is mounted on the rear frame; and folding mechanisms are respectively arranged between the front frame and the rear frame, between the bike head and the front fork and between the rear frame and the rear fork, the transmission device is mounted in a front end of the rear fork, the pedestals are mounted on the crank, the crank is connected with an input end of the transmission device, the rear wheel is connected with the transmission device, and the transmission device is a reciprocating type acceleration driving mechanism. The half-containing type symmetric folding bike provided bythe invention can be folded and unfolded rapidly, is high in folding rate, convenient for use, collection and transportation, and great in bearing capability; and each component well meets the human motion engineering so that people riding the bike is natural in posture and cannot get fatigue easily.

Description

technical field [0001] The invention relates to a human-powered vehicle bicycle, in particular to a semi-contained symmetrical folding bicycle. Background technique [0002] The advantage of a foldable bicycle is that it has a relatively compact structure that is convenient for storage, carrying or transportation. Known folding bicycles have a vehicle frame that includes two or more parts that can be disassembled, folded or shortened. In some known folding bicycles, the folded size can be further reduced by removing the wheels that disassemble them. But it is difficult to be accepted by people because of the shortcomings such as too low folding rate, cumbersome folding methods, unsatisfactory riding performance or complicated manufacturing, high cost, and unattractive appearance. The dimensions of ordinary bicycles have been tested by long-term practice and are in line with ergonomics, which makes people ride in a natural posture, is not prone to fatigue, and has better ad...

AI Technical Summary

Problems solved by technology

[0004] Although the folding bicycle with the patent No. ZL200920099901.5 basically realizes that the front and rear wheels of the bicycle rotate into the front and rear beams with an inverted U-shaped section, and the folding is realized through the hinges, but the spatial structure strength of the curved front and rear beams is not high, or in order to achieve the required The required strength will inevitably increase the material thickness of the beam and increase the weight; the front and rear wheel brackets are not fixedly connected to the front and rear beams through the pin shaft and the positioning pins in the arc-shaped grooves, and there are potential safety hazards. The position of the front and rear beams screwed in is uncertain, which is inconvenient to manufacture; one end is fixed on the linkage rod on both sides (outside) of the frame, and the other end will be stuck on the arc of the rear beam during the process of screwing the rear wheel bracket into the rear beam (inside), causing the rear wheel and The rear wheel bracket cannot be screwed into the rear beam correctly; the rear wheel bracket is screwed into the rear beam together with the wheels, which will inevitably cause the rear beam to be too wide and the weight will increase greatly; the intermediate wheel is located on the rear wheel bracket. , the distance between the driving wheel and the intermediate wheel will inevitably change. When the chain between them is tense, it will prevent the rear wheel from screwing into the rear beam. When the chain is loose, it will cause the chain to fall off; the distance between the driving wheel and the intermediate wheel The chain is exposed and lacks protective measures, so it is easy to stain the rider's clothes, and it is inconvenient to carry after folding; there is no locking mechanism to fix the front and rear wheels after they are screwed into the front and rear beams, and there is no locking mechanism to fix the front and rear beams after folding, which is easy scattered, inconvenient to carry

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