Bicycle derailleur structure

Abstract

The utility model relates to bicycle speed change technical field, and disclose a bicycle speed change gear structure, including speed change box, through with fixed axle gear group and speed change gear group integration in speed change box inside, and fixed axle gear group and speed change gear group's gear disc correspond in turn meshing according to diameter relation, utilize the handlebar drive adjusting screw rod rotates in cross -shaped guide rail, drive screw hole sliding block and side part conical resistance block horizontal movement, conical resistance block and the limit clamping plate end's triangular block contact and promote its compression spring in recess, make limit clamping plate extend and be clamped into the clamping groove of speed change gear group gear disc, realize specific gear disc and the synchronous rotation of rotating shaft to change transmission ratio, will core speed change component be closed in speed change box, avoided the chain derailleur exposure outside and was influenced by vibration, silt and abrasion, significantly promoted the durability and transmission stability of speed change structure, guarantee the power transmission reliable in the process of riding.

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