Abstract: A bicycle hub structure has a hub member, a clutch set, a driving base and a sleeve. The thread angle of the outer threaded section of the driving base is greater than the thread angle of the inner threaded section of the driving central shaft, so that the driving central shaft and the external toothed coupling collar have a coupling state instantly which greatly reduces the actuation stroke of the clutch set, improves the smoothness of driving and the sensitivity of the hub member.

Abstract: A bicycle hub apparatus may comprise a wheel hub, a freewheel and a driving base. The freewheel comprises a first chainwheel and a second chainwheel, a first elastic piece, and a second elastic piece. A lateral surface of the first chainwheel comprises a first teeth while a lateral surface of the second chianwheel has a third teeth, and the first teeth is configured to engage with the third teeth to have a synchronous rotation in clockwise direction. Also, the other lateral surface of the first chainwheel has a second teeth while the other lateral surface of the second chainwheel comprises a fourth teeth such that when the first chainwheel and the second chainwheel are rolled over, the second teeth is adapted to engage with the fourth teeth to have a synchronous rotation in counterclockwise direction.

Abstract: A reinforcement for a hub ratchet base comprising a chain-ring and a ratchet ring. The chain-ring is made of an aluminum material having a chain-ring socket and an assembly shaft. The ratchet ring is made of a metal material with high hardness which can be the titanium alloy material or the chrome-molybdenum steel material. The ratchet ring has an engaging slot corresponding to the assembly shaft of the chain-ring. There are at least three connecting slots disposed on the ratchet ring for accepting at least three ratchet members and at least three corresponding elastic members. Each of the connecting slots of the ratchet ring has a pivoting portion on an end for engaging with a ratchet member and an engaging portion on another end for engaging with an elastic member such that the elastic member pushes against a bottom portion of the ratchet member.

Abstract: A bicycle hub apparatus may comprise a hub body, a freewheel shell and an elastic spacer. The hub body has an axial hub axle, and an end of the hub body comprises an open-ended connecting space. A driving ring having a plurality of first driving teeth is installed inside the connecting space. The freewheel shell mounted on the hub axle of the hub body has an open-ended connecting recess, and a coupling ring received inside the connecting recess comprises a plurality of second driving teeth which are configured to engage with the first driving teeth. The elastic spacer secured in the connecting recess is coupled with an inner surface of the coupling ring. With the elastic spacer, the second driving teeth can firmly engage with the first driving teeth of the driving ring when a bicyclist pedaling in the forward direction.

Abstract: A bicycle hub apparatus may comprise a wheel hub, a hub body for installing a sprocket, and a one-way bearing unit positioned between the wheel hub and the hub body. A connecting housing is formed at a lateral end of the wheel hub, and a shaft axially protrudes from a central portion of the connecting housing. A driving ring made of high-strength material is securely positioned in the connecting housing, and a driving surface is formed on an inner periphery of the driving ring. The hub body adapted to connect to the wheel hub comprises a gear sleeve and a driving sleeve which are made of high-strength material to make the bicycle hub apparatus lightweight and prevent the wheel hub and the hub body from worn by the bearing unit, thereby improving transmission efficiency.

Abstract: A bicycle hub apparatus may comprise a hub body, a freewheel shell and an elastic spacer. The hub body has an axial hub axle, and an end of the hub body comprises an open-ended connecting space. A driving ring having a plurality of first driving teeth is installed inside the connecting space. The freewheel shell mounted on the hub axle of the hub body has an open-ended connecting recess, and a coupling ring received inside the connecting recess comprises a plurality of second driving teeth which are configured to engage with the first driving teeth. The elastic spacer secured in the connecting recess is coupled with an inner surface of the coupling ring. With the elastic spacer, the second driving teeth can firmly engage with the first driving teeth of the driving ring when a bicyclist pedaling in the forward direction.

Abstract: An improved wheel hub may include a hub body, a freewheel unit, a connecting sleeve and an external freewheel. The connecting sleeve connects to the ratchet sleeve of the hub body in order to provide more space for the external freewheel. With the design of the connecting sleeve and the external freewheel unit, the hub body loaded with more smaller freewheels provides more pedaling speeds for a bicycle travelling downhill. When cycling downhill by using the smaller diameters of the sprockets, the smaller sprockets of the external freewheel can help a cyclist to maintain an optimum pedaling speed in a slopy terrain, and the speed of the bicycle can be easily controlled.

Abstract: A bicycle hub apparatus may include a hub body and a freewheel body, and a first driving ring, a second driving ring, and third driving ring are sequentially located between the hub body and the freewheel body. The second driving ring is coupled inside the first driving ring to rotate around a shaft of the hub body simultaneously. A second lateral surface of the second driving ring facing to the third driving ring has a plurality of first engaging teeth, and a plurality of second engaging teeth protruding from a first surface of the third driving ring which faces to the second driving ring is configured to engage with the first engaging teeth of the second driving ring. The number of the second engaging teeth is a multiple of the first engaging teeth, to improve the engagement between the first engaging teeth and the second engaging teeth.

Abstract: A bicycle hub apparatus may include a hub body, a driving ring, a freewheel body, and a ratchet unit. A plurality of driving teeth are sequentially formed around an inner periphery of the driving ring. Since the separated distances between two adjacent driving teeth is smaller, the driving ring comprises more driving teeth, and the number thereof is up to 155 teeth. Also, the ratchet unit comprises a plurality of engaging pieces, and each of the engaging pieces has numerous engaging teeth, and the sizes thereof are corresponding to the driving teeth. As a result, the bicycle hub apparatus in the present invention improves the efficiency of engaging process between the engaging teeth and the driving teeth, and further lowers the possibility of missing step and the risk of use.

Abstract: An improved knife sharpener may include a hub body, a freewheel unit, a connecting sleeve and an external freewheel. The connecting sleeve connects to the ratchet sleeve of the hub body in order to provide more space for the external freewheel. With the design of the connecting sleeve and the external freewheel unit, the hub body loaded with more smaller freewheels provides more pedaling speeds for a bicycle travelling downhill. When cycling downhill by using the smaller diameters of the sprockets, the smaller sprockets of the external freewheel can help a cyclist to maintain an optimum pedaling speed in a slopy terrain, and the speed of the bicycle can be easily controlled.

Abstract: A bicycle hub assembly includes a hub shell defining a toothed drive member mounting hole and a locating groove, a locating member having a positioning portion accommodated in the locating groove of the hub shell, and a toothed drive member having a first locating portion fastened to the positioning portion of the locating member and a plurality of teeth. In an alternate form of the invention, the bicycle hub assembly includes a hub shell defining therein a toothed drive member mounting hole and a plug hole; a locating member having a positioning portion and a plug portion that is plugged into the plug hole of the hub shell, and a toothed drive member having a first locating portion fastened to the positioning portion of the locating member and a plurality of teeth formed therein.

Abstract: A bicycle hub assembly includes an axle, a first axle bearing having an inner race sleeved on the axle and an outer race, a second axle bearing having an inner race sleeved on the axle and an outer race, an axle sleeve unit including first and second inner race stopping portions respectively stopped against the inner race of the first axle bearing and the inner race of the second axle bearing, one of both of the first and second inner race stopping portions being made in the form of a flange, a hub shell unit including a hub shell connected to the outer race of the first axle bearing and a driven portion, and a driving unit connected to the outer race of the second axle bearing and including a driving member for rotating the driven portion of the hub shell unit.

Abstract: A bicycle hub assembly includes a hub shell defining a toothed drive member mounting hole and a locating groove, a locating member having a positioning portion accommodated in the locating groove of the hub shell, and a toothed drive member having a first locating portion fastened to the positioning portion of the locating member and a plurality of teeth. In an alternate form of the invention, the bicycle hub assembly includes a hub shell defining therein a toothed drive member mounting hole and a plug hole; a locating member having a positioning portion and a plug portion that is plugged into the plug hole of the hub shell, and a toothed drive member having a first locating portion fastened to the positioning portion of the locating member and a plurality of teeth formed therein.

Abstract: A driving apparatus for a rear hub of a bicycle includes a hub shell, a single-directional driving component and a dual-directional driving component, wherein the single-directional driving component has a ratchet ring and a ratchet base, and a plurality of inclined helical surfaces are located around an inner perimeter of the ratchet ring, and a plurality of engaging ribs that engage with the wedging ribs of the fixed ring of the hub shell are located around an outer perimeter of the ratchet ring. A plurality of conjugating portions are located around an outer perimeter at one end of the ratchet base to form a resilient unit and a hook against the inclined helical surface. A plurality of conjugating ribs are located around one end of the dual-directional driving component, and the conjugating ribs are used to engage with the wedging ribs of the fixed ring of the hub shell.

Abstract: A hub assembly for a bicycle includes a shaft, a hub body rotatably mounted on the shaft, a drive seat rotatably mounted on the shaft and engaging the hub body, a first bearing located between the shaft and the hub body, a second bearing located between the shaft and the hub body, and a bushing unit located between the first bearing and the second bearing. The bushing unit includes a first adjusting sleeve and a second adjusting sleeve. The first adjusting sleeve has a first end provided with an outer threaded portion and a second end abutting the first bearing. The second adjusting sleeve has a first end provided with an inner threaded portion screwed onto the outer threaded portion of the first adjusting sleeve and a second end abutting the second bearing.

Abstract: A driving apparatus for a rear hub of a bicycle includes a hub shell, a single-directional driving component and a dual-directional driving component, wherein the single-directional driving component has a ratchet ring and a ratchet base, and a plurality of inclined helical surfaces are located around an inner perimeter of the ratchet ring, and a plurality of engaging ribs that engage with the wedging ribs of the fixed ring of the hub shell are located around an outer perimeter of the ratchet ring. A plurality of conjugating portions are located around an outer perimeter at one end of the ratchet base to form a resilient unit and a hook against the inclined helical surface. A plurality of conjugating ribs are located around one end of the dual-directional driving component, and the conjugating ribs are used to engage with the wedging ribs of the fixed ring of the hub shell.

Abstract: A hub assembly includes a shaft, a hub mounted on the shaft and having a plurality of locking grooves, a driven ring mounted in the hub and having a plurality of oneway ratchet teeth, a drive seat rotatably mounted on the shaft, a drive ring mounted on the drive seat and received in the driven ring, a plurality of pawl members mounted on the drive ring and meshing with the oneway ratchet teeth, a sprocket secured on the drive seat, and a control ring slidably mounted on the drive seat and having a plurality of locking blocks releasably locked in the locking grooves. Thus, a user only needs to move the control ring to switch the operation modes of the bicycle between a normal riding and an acrobatic performance so that the user can change the two operation modes easily and quickly.

Abstract: A hub for a bicycle includes a shaft (12), a hub body (40), a ratchet wheel (43), a drive seat (10), a support ring (15), a rotation ring (21), a plurality of pawl members (22), a stop bushing (121), a limit ring (30) and a damper (33). Thus, when the drive seat is rotated backward by the pedal, each of the pawl members is retracted into the respective receiving slot (212) of the rotation ring to disengage the oneway ratchet teeth (42) of the ratchet wheel, so that each of the pawl members is spaced from and will not touch the ratchet wheel when the pedal is driven backward to prevent from producing a noise when the pedal is driven backward.

Abstract: A hub assembly for a bicycle includes a shaft (12), a hub body (40), a driven ring (43), a drive seat (10), a rotation ring (20), a plurality of pawl members (22), a plurality of push balls (23), a mounting sleeve (32), a damping ring (30), and a plurality of tension adjusting mechanisms (37). Thus, each of the pawl members is driven by each of the push balls in a rolling manner so that each of the pawl members is moved smoothly and stably without incurring sliding friction, thereby facilitating operation of the drive seat. In addition, each of the tension adjusting mechanisms is used to adjust the damping force of the damping ring, so that the damping force of the damping ring is distributed evenly.