Abstract: A bicycle hub assembly includes a hub having a driving tube connected one end thereof and the driving tube includes a ratchet portion and a sprocket portion respectively defined in an outer periphery thereof. A first recess and a second recess are defined in an inner periphery of the driving tube, wherein the first recess is located corresponding to the ratchet portion and the second recess is located corresponding to the sprocket portion. A ratchet unit is mounted to the ratchet portion and a sprocket unit is mounted to the sprocket portion. A first rotary member and a second rotary member are engaged with the first recess and the second recess respectively.

Abstract: A positioning device includes a battery box having a first connection base and a second connection base on two ends thereof. The first connection base has two first positioning members on two sides thereof. A first fixing base includes a first reception space for receiving the first connection base and the first fixing base is pivotable relative to the first fixing base. A second fixing base is connected to the second positioning portion. The positioning recess guides the positioning members on the first connection base to slide and pivot. The second connection base is connected to the second fixing base. The battery box is easily taken out and installed.

Abstract: A hub assembly includes a hub and an axle extending through the hub. A ratchet ring is located in the hub and has multiple ratchet teeth in an inside thereof. A transmission unit has a ratchet part located in the ratchet ring and the ratchet part has at least one transmission recess and at least one positioning recess defined in an outside thereof. The at least one transmission recess and the at least one positioning recess respectively have a transmission piece and a positioning pieces rotatably received therein. The transmission piece has a driving end engaged with one of the ratchet teeth. A resilient ring restricts the transmission piece and the positioning piece on the ratchet part. By the switch the transmission piece and the positioning piece, the transmission direction can be changed.

Abstract: A bearing positioning device for hub assembly includes a hub with a sleeve connected thereto, and an axle extends through the hub and the sleeve. A ratchet part extends from the sleeve and the sleeve has an engaging hole through which the axle extends. An inner bearing is mounted to an inner ring of the axle. A contact unit has at least one contact member which is mounted to the axle and has a flange whose diameter is larger than the inner diameter of the engaging hole. A contact surface is formed on one side of the at least one contact member and contacts on a side of the inner ring. The engaging hole is reduced so that the thickness of the sleeve is not reduced so as to reduce the wearing of the tools and the machining time required.

Abstract: A positioning device includes a battery box having a first connection base and a second connection base on two ends thereof. The first connection base has two first positioning members on two sides thereof. A first fixing base includes a first reception space for receiving the first connection base and the first fixing base is pivotable relative to the first fixing base. A second fixing base is connected to the second positioning portion. The positioning recess guides the positioning members on the first connection base to slide and pivot. The second connection base is connected to the second fixing base. The battery box is easily taken out and installed.

Abstract: A bicycle hub assembly includes a hub and a tubular portion extends from one end of the hub. A sprocket is connected to the tubular portion. A ratchet unit is located between the hub and the transmission unit so that the hub and the transmission unit are operatively connected to each other indirectly and in one way by the ratchet unit. A control unit has first positioning portions on the hub and second positioning portions integrally formed with the tubular portion. The first positioning portions and the second positioning portions are connected to each other by bolts, and the first positioning portions and the second positioning portions are separated from each other when the bolts are removed. The hub assembly can be switched between direct and two-way transmission into indirect and one-way transmission by arrangement of the bolts.

Abstract: A bicycle hub assembly includes two end caps which are two collar-shaped member and an axle is connected between the two end caps. A casing is mounted to two respective outer peripheries of the two end caps and accommodates the axle therein. The two end caps and the casing form a smooth and curved outer shape. Two collars are connected to two distal ends of the two end caps and two ends of the casing. Two positioning bolts extend through the collars and are threadedly connected to the two ends of the axle. Multiple copper heads are connected to the two end caps and protrude outward from the casing at an angle so as to be connected to spokes.

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 assembly includes a hub having a driving tube connected one end thereof and the driving tube includes a ratchet portion and a sprocket portion respectively defined in an outer periphery thereof. A first recess and a second recess are defined in an inner periphery of the driving tube, wherein the first recess is located corresponding to the ratchet portion and the second recess is located corresponding to the sprocket portion. A ratchet unit is mounted to the ratchet portion and a sprocket unit is mounted to the sprocket portion. A first rotary member and a second rotary member are engaged with the first recess and the second recess respectively.

Abstract: A hub ratchet driving assembly includes a hub and a driving member is connected to an end of the hub. The driving member includes a driving portion which has first and second recesses defined in an outer surface thereof so as to receive a pawl and a spring member therein. A teeth ring is connected to the hub and includes multiple teeth in an inner periphery thereof. The spring member biases the pawl so as to provide a return force to the pawl. The pawl includes two ratchet teeth which are engaged with the teeth of the teeth ring. A positioning unit has a first positioning slot defined in the driving portion and a second positioning slot is defined in the pawl. A positioning ring is mounted to the first and second slots so as to prevent the pawl from disengaging from the driving portion in axial direction.

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: A connection tube of bicycle rear wheel hub includes a connection portion and an engaging portion one two ends of the connection tube, the connection portion is connected to the bicycle rear wheel hub. The engaging portion is a hollow tube and four elongate driving ribs extend radially from an outer periphery of the engaging portion. Each driving rib includes a driving surface and an inclined surface on two sides thereof. The driving surface is perpendicular to the outer periphery of the engaging portion. A positioning rib extends radially from an outer periphery of the engaging portion and is located between two driving ribs. Only the driving surface contacts the engaging ribs of the sprocket set.

Abstract: A bicycle hub assembly includes two end caps which are two collar-shaped member and an axle is connected between the two end caps. A casing is mounted to two respective outer peripheries of the two end caps and accommodates the axle therein. The two end caps and the casing form a smooth and curved outer shape. Two collars are connected to two distal ends of the two end caps and two ends of the casing. Two positioning bolts extend through the collars and are threadedly connected to the two ends of the axle. Multiple copper heads are connected to the two end caps and protrude outward from the casing at an angle so as to be connected to spokes.