Chainless hollow hub bicycle

Abstract

The invention discloses a chainless hollow hub bicycle. The chainless hollow hub bicycle comprises a frame, a rear wheel mechanism and a driving mechanism, wherein the frame comprises a connecting unit; the rear wheel mechanism comprises a ring-shaped fixing rack and a wheel hub arranged outside and rotatably connected with the ring-shaped fixing rack; the connecting unit is fixedly connected withthe ring-shaped fixing rack, and one side of the wheel hub is fixedly connected with an outer gear ring; the driving mechanism comprises a central axle hinged to the frame, and both ends of the central axle are connected with pedal levers. According to the chainless hollow hub bicycle, the rear mechanism and the driving mechanism abandon a chain driving manner in the prior art, solve the problemof releasing and fall-off of chains, improve the safety coefficient, greatly prolong the service life of the bicycle and reduce the maintenance cost; an applied planetary speed changing mechanism is low in manual transmission loss and meanwhile small, exquisite and high in gear ratio.

Description

technical field [0001] The invention relates to the technical field of bicycles, in particular to a chainless hollow hub bicycle. Background technique [0002] my country is a big country in the production and use of bicycles. For a long time, bicycles have always been used as the main means of transportation for people to travel short distances in the same city. The traditional chained bicycle relies on the wheel disc installed on the central shaft to drive the flywheel mechanism installed on the rear axle of the bicycle through the chain, and then drives the rear wheel of the bicycle to rotate through the flywheel mechanism for transmission. Although the structure is simple, it is easy to disengage. Chains and dropped chains; and because the transmission part is not easy to seal, skirts are often jammed, and the oil that lubricates the chain will also stain the underwear. At the same time, due to the poor sealing of the transmission mechanism, the exposed transmission par...

AI Technical Summary

Problems solved by technology

The traditional chained bicycle relies on the wheel disc installed on the central shaft to drive the flywheel mechanism installed on the rear axle of the bicycle through the chain, and then drives the rear wheel of the bicycle to rotate through the flywheel mechanism for transmission. Although the structure is simple, it is easy to disengage. Chains and dropped chains; and because the transmission part is not easy to seal, skirts are often jammed, and the oil that lubricates the chain will also stain the underwear. At the same time, due to the poor sealing of the transmission mechanism, the exposed transmission parts are easy to wear and rust , so that the life of the bicycle is shortened accordingly

Although this kind of transmission device with chain box can overcome the above-mentioned shortcoming to a certain extent, the problem of unchaining and chain dropping is still difficult to solve. It is more difficult to install and maintain under

[0003] In order to solve the disadvantages of chain transmission, the transmission method of transmission rod is applied to bicycle transmission, but because the transmission rod is engaged with the respective conical gears of the center shaft and rear shaft at a certain angle relative to the center line, that is, the meshed conical gears The shaft angle of the gear is not 90 degrees (orthogonal), so the most commonly used standard bevel gear with a shaft angle of 90 degrees in mechanical transmission cannot be used. Instead, the parameters of the bevel gear need to be designed separately according to the specific shaft angle. These parameters are specially processed to produce specific and applicable bevel gears, and the installation process needs to be assembled strictly according to the designed shaft angle, which will lead to an increase in a series of costs such as design costs, processing costs, assembly costs, and maintenance costs.

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