Abstract: A hub assembly includes a hub and a driving tube is connected to one end of the hub, the driving tube includes a connection end and a sprocket portion located on two ends thereof. The connection portion is inserted into the hub and the sprocket portion has a reception hole defined in an end thereof. An axle extends through the hub and the driving tube. A rotary unit is located between the reception hole and the axle, and includes a tubular member which is mounted to the axle and includes a stop flange. At least one space is defined between the tubular member, the stop flange and an inner periphery of the reception hole. At least one self-lubricating bearing is located in the space and two sides of the self-lubricating bearing are well positioned by the stop flange and the locking unit.

Abstract: A bicycle hub includes a tubular portion which is fixed to the hub and includes at least one first transmission portion and at least one second transmission portion. The first transmission portion extends axially and radially outward from the tubular portion. The at least one second transmission portion includes at least one positioning protrusion on the tubular portion and at least one engaging member which has a first end mounted to the at least one positioning protrusion so as to form the at least one second transmission portion. Two sides of the at least one positioning protrusion are covered by the at least one engaging member. The at least one engaging member of the at least one second transmission portion provides dual-direction protection feature so as to reduce wearing when the flywheels 50 rotate.

Abstract: A bicycle hub includes a tubular portion which is fixed to the hub and includes at least one first transmission portion and at least one second transmission portion. The first transmission portion extends axially and radially outward from the tubular portion. The at least one second transmission portion includes at least one positioning protrusion on the tubular portion and at least one engaging member which has a first end mounted to the at least one positioning protrusion so as to form the at least one second transmission portion. Two sides of the at least one positioning protrusion are covered by the at least one engaging member. The at least one engaging member of the at least one second transmission portion provides dual-direction protection feature so as to reduce wearing when the flywheels 50 rotate.

Abstract: The present invention discloses a bicycle hub speed-change assembly having a planetary gear set disposed therein, a speed-change gear wheel separately disposed on both left and right sides of the planetary gear set, and a first ratchet jacket and a second ratchet jacket respectively disposed on the external side of the speed-change gear wheels, such that control ratchets of the first ratchet jacket and second ratchet jacket are selectively hidden or driven by an external ring of the planetary gear set to couple the first ratchet jacket with a hub, so as to provide three different speeds and the invention features the advantages of stable speed, simplified components, and light weight.

Abstract: This invention discloses a bicycle ratchet bushing, comprising a bushing for coupling to a connecting axle rod to drive the bicycle wheel to rotate, a pawl ring disposed on the inner side of the bushing, a plurality of pawls interdentally dispersed around the outer periphery of the ratchet ring, a resilient ring surrounding each pawl, such that the inner end of the pawl is a pivotal circular turning end, and the outer end is a moving end capable of opening outwards and retracting, and a pawl ring being sheathed outside the ratchet wheel, such that a buffer space is designed at the internal diameter of the pawl ring to prevent noise production from friction between the resilient ring and the pawl ring of the bushing.