Bicycle chain shifting structure and bicycle

Abstract

The invention provides a bicycle chain shifting structure and a bicycle. The bicycle chain shifting structure comprises a bicycle frame provided with a first rear fork and a second rear fork, a hub shaft arranged between the first rear fork and the second rear fork in a straddling mode, a first chain wheel rotatably connected to the middle of the bicycle frame around the axis of the first chain wheel, a hub shell mounted on the hub shaft in a sleeving mode and rotatably connected with the hub shaft, a flywheel set mounted on the hub shell in a sleeving mode, a chain shifting device, and a chain connected with the first chain wheel, the flywheel set and a chain expansion unit. The flywheel set is located between the first rear fork and the second rear fork, the chain shifting device comprises a fixing seat connected with the first rear fork and the chain expansion unit, and the fixing seat is provided with a guiding column facing the flywheel set. The chain expansion unit is slidably connected with the guiding column. The bicycle comprises the bicycle chain shifting structure. The bicycle chain shifting structure and the bicycle have the advantages that the structure is simple and reliable, the production cost is low, and the chain shifting device can be protected.

Description

technical field [0001] The invention relates to the technical field of bicycles, in particular to a bicycle derailleur structure and a bicycle comprising the bicycle derailleur structure. Background technique [0002] The rear derailleur of the bicycle is assembled on the rear flat fork of the bicycle frame, and is used to cooperate with the combined speed change gear installed on the bicycle. The rear derailleur drives the chain to mesh with gears of different sizes, thereby realizing the bicycle's Shift gears. When the bicycle is shifted, the shift cable is pulled by the shift adjuster, which deforms and moves the connecting rod structure of the rear derailleur and drives the chain guide to shift, thereby pushing the chain to mesh with different gears. The rear derailleur of bicycles is mainly installed on mountain bikes or road bikes to meet people's sports needs. Of course, with the rise of shared bicycles, many simple bicycles will be equipped with combined gears, rea...

AI Technical Summary

Problems solved by technology

However, this bicycle hydraulic rear derailleur is not suitable for a freewheel set with more than six freewheels, because when there are too many freewheels, the diameter difference between the freewheels will be too large, which will cause the sliding shift structure to appear up and down smoothly. question

Furthermore, the bicycle hydraulic rear derailleur needs additional adjustment screw pairs to change the moving range of the guide wheel bracket, which increases the complexity of the derailleur structure. Chain operation, resulting in high production costs and prone to oil leakage, which in turn makes the hydraulic rear derailleur of this bicycle unreliable

[0004] In addition, whether it is a mountain bike, a road bike or a simple bicycle, the rear derailleur is installed on the outside of the rear chainstay of the bicycle frame, making the rear derailleur very easy to be bumped or hit, especially when there is a crash When the bicycle's rear derailleur hits the ground or gravel directly, the rear derailleur is prone to damage

Moreover, the cranks of the existing derailleurs are all set towards the rear of the bicycle during use, so that the bicycle frame cannot effectively protect the cranks, causing the cranks to be exposed outside the frame for a long time and easily impacted by foreign objects. increase the risk of damage

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