Abstract: An internal transmission device for a bicycle. The device includes a slave member, a driver, a planetary gear mechanism disposed between the driver and the slave member, and an automatic shift control mechanism actuated relative to a rotational angle of the driver in a driving direction. The automatic shift control mechanism includes a first one way clutch, a clutch control member and a first abutment member that is disposed on the inner peripheral surface of the slave member.

Abstract: An exercise bicycle including a frame having a seat and handlebars, a high-inertia flywheel having a hub at a center of rotation, the flywheel being rotatably supported on the frame at the hub, and a drive train including a drive sprocket, a crank arm attached to and extending from the drive sprocket, and a pedal attached to the crank arm, the drive train being rotatably supported by the frame. The drive train also includes a slave sprocket fixed to the flywheel at the hub, with the drive and slave sprockets connected in a direct-drive relationship, the drive train driveable in a forward and rearward directions to cause the flywheel to rotate. A clutch mechanism is positioned in engagement with the slave sprocket and the hub to create a frictional engagement between the sprocket and the hub, and to establish a break-free force threshold.

Abstract: Freewheel hub, especially for bicycles and similar contrivances comprising a hub axle, a hub shell arranged concentrically thereto, a rotator arranged concentrically to said hub axle for receiving a sprocket wheel with pinions and a freewheel means disposed with ratchet pawls. Roller bearings are employed for the rotatable support of said hub shell relative the hub axle and for the rotatable support of said rotator relative said hub shell and comprise roller bodies each respectively disposed at a predetermined distance from one another.

Abstract: A freewheel hub device comprises a spindle. A hub, a ratchet, a freewheel, an annular cover, and a sealing washer are sequentially arranged along the spindle. A flange extends from the freewheel at a position with respect to the inner lateral side of the hub. A ball ring encloses the flange so as to position the ratchet. The recess is installed at another end of the hub. An inner periphery of the recess is installed with a plurality of retaining grooves and first texture recesses. An inner side of the recess is arranged with a ratchet ring. The flange extending from the freewheel is engaged with a positioning ratchet pawl. The ratchet ring is installed with a groove. After the ball ring and ratchet are engaged with the flange. The flange and the ratchet ring are installed in the recess of the hub.

Abstract: A freewheel hub device comprises a spindle. A hub, a ratchet, a freewheel, an annular cover, and a sealing washer are sequentially arranged along the spindle. A flange extends from the freewheel at a position with respect to the inner lateral side of the hub. A bearing encloses the flange so as to position the ratchet. The recess is installed at another end of the hub. An inner periphery of the recess is installed with a plurality of retaining grooves and first texture recesses. An inner side of the recess is arranged with a ratchet ring. The flange extending from the freewheel is engaged with a positioning ratchet pawl. The ratchet ring is installed with a groove. After the bearing and ratchet are engaged with the flange. The flange and the ratchet ring are installed in the recess of the hub.

Abstract: A bicycle hub includes a hub axle, a hub body and a sprocket support member. The hub axle has first and second portions releasably coupled together. The hub body has an outer tubular portion, a first engagement portion coupled to the outertubular portion and an interior passageway. The first portion of the hub axle is rotatably supported in the interior passageway. The first engagement portion is formed with a first meshing surface. The sprocket support member is mounted on the second portion of the hub axle and has a second engagement portion formed with a second meshing surface non-rotatably engaged with the first meshing surface. The first and second meshing surfaces are so dimensioned to overlap to prevent axial separation without relative rotation occurring between the first and second engagement portions.

Abstract: A wheel hub device includes a driving barrel and a hub shell mounted rotatably on an axle of a bicycle. When the shell is rotated via the barrel to move the bicycle forward, a coupling socket disposed in the shell threadedly engages the barrel and frictionally engages the shell. A coil spring is disposed between the shell and the coupling socket such that a sudden termination of rotation of the barrel while the bicycle continues to move forward due to inertia, imparts a frictional force to the coil spring to enable the coil spring to keep biasing against the coupling socket and against the biasing force of a associating spring disposed between the coupling socket and a sliding member, thereby disengaging the coupling socket from the shell to permit smooth idle rotation of the latter and to prevent rotation of the barrel with the shell.

Abstract: A wheel hub device includes a driving barrel and a hub shell mounted rotatably on an axle of a bicycle. When the shell is rotated via the barrel to move the bicycle forward, a coupling socket disposed in the shell threadedly engages the barrel and frictionally engages the shell. A coil spring is disposed between the shell and the coupling socket such that a sudden termination of rotation of the barrel while the bicycle continues to move forward due to inertia, imparts a frictional force to the coil spring to enable the coil spring to keep biasing against the coupling socket and against the biasing force of a associating spring disposed between the coupling socket and a sliding member, thereby disengaging the coupling socket from the shell to permit smooth idle rotation of the latter and to prevent rotation of the barrel with the shell.

Abstract: A freewheel clutch includes detent pawls located between first and second clutch parts. The pawls are moved exclusively by control elements. As a result, the freewheel clutch does not need any spring elements to hold the pawls in place. The control elements are attached to a common actuating ring. The freewheel clutch can be very easily assembled, and only a small amount of force is required to move the pawls.

Abstract: A low-noise low-friction resistance one-way drive gear wheel assembly includes a gear wheel having tapered recesses radially extended around the inner thereof and supported on a hub, each tapered recess holding a spring-supported ball rack, a first rolling ball, and a second rolling ball in the ball rack for stopping the first rolling ball, the first rolling ball being moved between an engagement position where the gear wheel and the hub are locked for synchronous rotation, and a disengagement position where the hub is freely rotated relative to the gear wheel.

Abstract: A low-noise low-friction resistance one-way drive gear wheel assembly includes a gear wheel having tapered recesses radially extended around the inner thereof and supported on a hub, each tapered recess holding a spring-supported ball rack, a first rolling ball, and a second rolling ball in the ball rack for stopping the first rolling ball, the first rolling ball being moved between an engagement position where the gear wheel and the hub are locked for synchronous rotation, and a disengagement position where the hub is freely rotated relative to the gear wheel.

Abstract: A bicycle hub basically includes a hub axle, a hub body, a sprocket support member and an engagement member. The hub axle has first and second portions releasably coupled together. The hub body has an outer tubular portion and an interior passageway. The first portion of the hub axle is rotatably supported in the interior passageway. The sprocket support member is mounted on the second portion of the hub axle. The engagement member non-rotatably couples the outer tubular portion to the sprocket support member in an engaged position and is axially movable by the hub axle between the engaged position and a disengaged position. The hub body can be separated from the sprocket support member when the engagement member is in the disengaged position and the first and second portions of the hub axle are released from each other.

Abstract: It is an improvement of the clutch of the hub of the bicycle. The clutch is made up of the sleeve with attaching holes inside, the spiral connection part formed at the end of smaller diameter with the stair stepping tube, and the screw bar whose end of bigger diameter is the head part; the clutch crosses through the axle inside the hub and uses resisting component made up of the ball bearing that presses the spring to accommodate it in the connection hole of axle, or the leaf spring whose two ends are bent to be elastic clamp end in the distance existing between the axle and sleeve, to produce the clamp and directional function of point contact to the inner wall of sleeve; therefore, at the moment that the freewheel links the head part of screw bar to transmit the kinetic energy, it will not turn in the same direction with the screw bar and can respond to screw forward or backward instantly to decide whether it attaches to the inner wall of hub or not, thus to reduce the friction loss.

Abstract: A freewheel is provided for mounting a plurality of sprockets on an axle of a bicycle. The freewheel basically includes an inner tubular body, an outer tubular body coaxially mounted on the inner tubular body with a bearing assembly rotatably coupling the inner tubular body to the outer tubular body. A one-way clutch is coupled between the inner tubular body and the outer tubular body to allow one-way rotation between the inner and outer tubular bodies. In the preferred embodiment, seven sprockets are mounted on the exterior of the outer tubular body. The bearing assembly has a pair of ball bearing races of the same diameter located at one end. An outer ball housing and a side plate are utilized in conjunction with the inner tubular body to fixedly secure the first and second ball bearings on the exterior surface of the inner tubular body. The inner tubular body with the bearings is then fixedly coupled to the outer tubular body so that the outer tubular body can rotate relative to the inner tubular body.

Abstract: A hub and methods of propulsion thereof are disclosed wherein fail safe engagement is provided for particular components of a hub assembly. Preferred embodiments may provide for a secondary pressure spring which provides redundancy to a first pressure spring to ensure engagement of particular drive elements. Additional preferred embodiments may provide back-up drive elements as a replacement for drive elements of the hub.

Abstract: A wheel hub with clutch for a bicycle, other transport vehicle or machine where power is transferred through a drive, such as a chain that is linked between a peddle arrangement and a gear or gears splined onto the hub. The hub provides free-wheeling when a torque is not applied thereto, and will instantly engage, transferring an applied torque therethrough and into a wheel connected to the hub. To provide which torque transfer the hub is free-rolling in a clock-wise or forward turning direction, but will lock to transfer torque therethrough, and turns also in a clock-wise direction when torque is applied as through a peddle arrangement. For locking, the hub includes, as a radial load bearing component, a sleeve whereon a gear or gears are splined, with the splined gear sleeve mounting a thick ring for fitting into an end of a wheel sleeve.

Abstract: A freewheel assembly (1) for a rear wheel of a bicycle includes a body (10), a sprocket wheel (12) mounted on the body (10), a sleeve (16) sandwiched between the body (10) and the sprocket wheel (12), a plurality of roller bearings (11) fitted between the sleeve (16) and the sprocket wheel (12), a disk clamp (15) fitted to a distal end of the body (10) and clamping the sprocket wheel (12) to the body (10), and pluralities of first and second ball bearings (13, 14) to ensure correct location of the sprocket wheel (12) and roller bearings (11). In a driving mode of the freewheel assembly (1), the roller bearings (11) engage the sprocket wheel (12) to the body (10). In a non-driving mode, the roller bearings (11) separate from sprocket wheel (12) to allow the body (10) to rotate while the sprocket wheel (12) does not rotate.

Abstract: A frictionless rear hub sprocket and ratchet assembly includes a sprocket fastened to the rear hub of the bicycle and coupled to the chain on the chain wheel of the bicycle, the sprocket having a plurality of internal teeth, a wheel concentrically disposed within an inner diameter of the sprocket, the wheel having equiangularly spaced pairs of stop elements, a ratchet mounted within the inner diameter of the wheel, and a plurality of pawls respectively pivoted to the wheel at one side and respectively disposed between two stop elements of each pair of the stop elements at the wheel, wherein when the sprocket does no work or is rotated clockwise, or when the ratchet does no work or is rotated counter-clockwise, the pawls do not engage the internal teeth of the sprocket and the external teeth of the ratchet, and the sprocket and the ratchet can be respectively rotated relative to each other; when the sprocket is rotated counter-clockwise or the ratchet is rotated clockwise, the pawls are respectively forced int

Abstract: A bearing assembly of a hub of a bicycle includes a receiving ring formed with an tapered inclined face and a catch flange; a roller bearing mounted in the receiving ring and including a plurality of rollers arranged in a tapered manner; a cover ring including a rigid plate formed with a locking flange rested on the catch flange, and a rubber layer coated on the rigid plate; and a positioning bolt head including a lower tapered urging portion, and an upper positioning portion. The lower tapered urging portion is urged on the rollers of the roller bearing to push the rollers to press the inclined face, such that the receiving ring, the roller bearing, and the positioning bolt head are combined with each other in a press-fit manner without detachment.

Abstract: A freewheel assembly (1) for a rear wheel of a bicycle includes a body (10), a sprocket wheel (12) mounted on the body (10), a sleeve (16) sandwiched between the body (10) and the sprocket wheel (12), a plurality of roller bearings (11) fitted between the sleeve (16) and the sprocket wheel (12), a disk clamp (15) fitted to a distal end of the body (10) and clamping the sprocket wheel (12) to the body (10), and pluralities of first and second ball bearings (13, 14) to ensure correct location of the sprocket wheel (12) and roller bearings (11). In a driving mode of the freewheel assembly (1), the roller bearings (11) engage the sprocket wheel (12) to the body (10). In a non-driving mode, the roller bearings (11) separate from sprocket wheel (12) to allow the body (10) to rotate while the sprocket wheel (12) does not rotate.

Abstract: A bicycle hub basically includes a hub axle, a hub body, a sprocket support member and an engagement member. The hub axle has first and second portions releasably coupled together. The hub body has an outer tubular portion and an interior passageway. The first portion of the hub axle is rotatably supported in the interior passageway. The sprocket support member is mounted on the second portion of the hub axle. The engagement member non-rotatably couples the outer tubular portion to the sprocket support member in an engaged position and is axially movable by the hub axle between the engaged position and a disengaged position. The hub body can be separated from the sprocket support member when the engagement member is in the disengaged position and the first and second portions of the hub axle are released from each other.

Abstract: A bicycle hub includes a hub axle, a hub body and a sprocket support member. The hub axle has first and second portions releasably coupled together. The hub body has an outer tubular portion, a first engagement portion coupled to the outer tubular portion and an interior passageway. The first portion of the hub axle is rotatably supported in the interior passageway. The first engagement portion is formed with a first meshing surface. The sprocket support member is mounted on the second portion of the hub axle and has a second engagement portion formed with a second meshing surface non-rotatably engaged with the first meshing surface. The first and second meshing surfaces are so dimensioned to overlap to prevent axial separation without relative rotation occurring between the first and second engagement portions.

Abstract: A freewheeling hub device is adapted to be mounted rotatably on an axle of a bicycle, and includes a hub shell which can be driven by a clockwise rotation of a driving barrel to rotate for forward movement of a bicycle wheel when a coupling socket engages threadedly the driving barrel and engages frictionally the hub shell.

Abstract: A hub includes a hub housing sleeved rotatably on a spindle, and a tubular end piece sleeved fixedly on the spindle. A tubular flexible seal member is disposed between the hub housing and the end piece, and includes an outer ring and an inner ring. The outer ring has a circular tubular portion with an axial inner end, and an inward flange that extends integrally, radially and inwardly from the inner end of the circular tubular portion to abut against a bottom wall of an annular groove that is formed in an end surface of the hub housing. The inner ring has a largest-diameter inner end that is formed integrally with an inner periphery of the inward flange, and a smallest-diameter outer end portion which is sleeved around and which is in tight engagement with a frictional outer surface of an insert portion of the end piece. The inner ring reduces gradually in inner diameter from the largest-diameter inner end to the smallest-diameter outer end portion.

Abstract: A bicycle wheel basically has a central hub assembly, a plurality of spokes extending outwardly from the central hub assembly and an annular rim coupled to the outer ends of the spokes for supporting a tire. The central hub assembly has a hub axle, a hub unit, a freewheel and a sprocket assembly with a plurality of sprockets. The hub axle has a center axis extending between a first frame mounting end and a second frame mounting end. The hub unit has a hub body, a first spoke mounting portion, a second spoke mounting portion and an interior passageway. The first spoke mounting portion is located adjacent a first end of the hub body. The second spoke mounting portion is located adjacent a second end of the hub body. The interior passageway extends through the hub body with the hub axle being rotatably supported therein. The freewheel is operatively coupled between the first end of the hub axle and the first end of the hub body.

Abstract: The present invention relates to the attachment of a rear bicycle wheel to the bicycle frame and involves a decoupling engagement mechanism between the one-way clutch assembly of the freehub, commonly referred to as the freehub body, and the rear hub shell.

Abstract: A multiple-speed chain driving device includes a shaft, a rotors'assembly, a chain driving sprocket, and a shifting assembly. The rotors'assembly is mounted on the shaft and includes three rotors which are vertically mounted on each other and enclosed within the sprocket. The shifting assembly is also mounted on the shaft and located parallel with respect to the rotors' assembly. The device can be made in either 3-speed or 2-speed design and enables a few slightly different configurations for both designs. The device enables a smooth shifting process and allows only one sprocket to produce the full range of speeds presently obtained by a front sprocket assembly in a bicycle.

Abstract: A freewheel clutch includes detent pawls located between first and second clutch parts. The pawls are moved exclusively by control elements. As a result, the freewheel clutch does not need any spring elements to hold the pawls in place. The control elements are attached to a common actuating ring. The freewheel clutch can be very easily assembled, and only a small amount of force is required to move the pawls.

Abstract: A hub and methods of propulsion thereof are disclosed wherein fail safe engagement is provided for particular components of a hub assembly. Preferred embodiments may provide for a secondary pressure spring which provides redundancy to a first pressure spring to ensure engagement of particular drive elements. Additional preferred embodiments may provide back-up drive elements as a replacement for drive elements of the hub.

Abstract: A hub transmission mechanism includes an axle extending through a spoke-mounting barrel such that a right axle portion thereof extends outwardly from the spoke-mounting barrel. A sprocket-mounting member is sleeved around the right axle portion, and includes an outer shell coupled with the spoke-mounting barrel, a bearing unit disposed within the outer shell around the axle, and a bearing retention member that is disposed in the outer shell around the axle outboard to the bearing unit. A flexible seal member is disposed within the outer shell between the bearing unit and an outward flange of the bearing retention member, and includes an L-shaped cross-sectioned outer ring which is in tight engagement with the outer shell and which has a thick left portion and a thin right portion that is thinner than the thick left portion and that has an inner diameter larger than that of the thick left portion.

Abstract: A hub transmission mechanism includes an axle coaxially inserted into a through hole in a spoke-mounting barrel such that a right axle portion thereof extends outwardly from the spoke mounting barrel. The sprocket mounting member is sleeved around the right axle portion, and includes an inner shell disposed rotatably within an outer shell around the right axle portion. The central bore of the inner shell has a small-diameter outer section, a large-diameter inner section, and a shoulder therebetween. A locking member is disposed within the inner shell, and has an enlarged right end section that is disposed in the large-diameter inner section and that has an outer diameter greater than the diameter of the small-diameter outer section of the central bore for preventing removal of the locking member from the inner shell.

Abstract: A freewheel is provided for mounting a plurality of sprockets on an axle of a bicycle. The freewheel basically includes an inner tubular body, an outer tubular body coaxially mounted on the inner tubular body with a bearing assembly rotatably coupling the inner tubular body to the outer tubular body. A one-way clutch is coupled between the inner tubular body and the outer tubular body to allow one-way rotation between the inner and outer tubular bodies. In the preferred embodiment, seven sprockets are mounted on the exterior of the outer tubular body. The bearing assembly has a pair of ball bearing races of the same diameter located at one end. An outer ball race or housing and a side plate are utilized in conjunction with the inner tubular body to fixedly secure the first and second ball bearings on the exterior surface of the inner tubular body.

Abstract: A hub transmission mechanism includes an axle inserted coaxially into a through-hole in a spoke-mounting barrel such that a right axle portion thereof extends outwardly from the spoke mounting barrel. A sprocket mounting member is sleeved around the right axle portion, and includes an outer shell coupled with a right end of the spoke-mounting barrel, left and right bearing units disposed within the outer shell, a tubular sleeve disposed within the outer shell around the right axle portion and between the bearing units, and a restricting spacer unit disposed within the outer shell and cooperating with the tubular sleeve to restrict radial and axial displacement of the bearing units relative to the outer shell, thereby defining an aligned bore for smooth extension of the right axle portion of the axle during assembly.

Abstract: A free-wheel hub transmission mechanism includes an axle coaxially inserted into a through hole of a spoke mounting barrel such that a right axle portion thereof extends outwardly from the spoke mounting barrel. A drive transmission block is disposed in the right end portion and has a force transmitting portion with first and second bevel faces. A sprocket mounting barrel is disposed around the right axle portion, and has a drive portion formed with a third bevel face for contacting the first bevel face. A clutch barrel is disposed around the axle, and has a coupling part threaded to the drive portion of the sprocket mounting barrel, and a block contacting part formed with a fourth bevel face for contacting the second bevel face. The clutch barrel is linearly displaceable relative to the axle to a driving position, where the clutch barrel cooperates with the sprocket mounting barrel to clamp the drive transmission block.

Abstract: A ratchet mechanism for a bicycle hub includes a first hub member and a second hub member, wherein the first hub member and the second hub member are rotatable relative to each other. A pawl is supported by the first hub member, a ratchet tooth is supported by the second hub member, and a biasing mechanism is provided for biasing the pawl toward the ratchet tooth. A pawl control mechanism is responsive to relative rotation of the first hub member and the second hub member for allowing the pawl to contact the ratchet tooth when the first hub member and the second hub member rotate relative to each other in one direction and for preventing the pawl from contacting the ratchet tooth when the first hub member and the second hub member rotate relative to each other in an opposite direction.

Abstract: A multi-speed bicycle transmission having a housing including spaced, opposing face plates, with each face plate having a pedal shaft opening and a secondary shaft opening. A pedal shaft is rotatably disposed within the pedal shaft openings of the face plates, and a secondary shaft is disposed within the secondary shaft openings. As such, the secondary shaft is spaced from, and parallel to, the pedal shaft. A pedal shaft set of gears are mounted on the pedal shaft between the face plates. The pedal shaft set of gears include: (1) a first set of pedal shaft gears mounted on the pedal shaft, (2) a second set of pedal shaft gears rotatably mounted on the pedal shaft, and (3) a third set of pedal shaft gears rotatably mounted on the pedal shaft including first means for selective driving engagement with the second set of pedal shaft gears. The third set of pedal shaft gears including a drive gear means such as a sprocket for engaging a drive chain.

Abstract: A bicycle freewheel hub includes a hollow hub shell sleeved rotatably on a shaft, a cylindrical driving member sleeved rotatably on the shaft and disposed adjacent to the hub shell, and a clutch unit including first and second clutch members sleeved rotatably on the shaft. The first clutch member is coupled to the driving member. The second clutch member is coupled to the hub shell. Each of the clutch members has an annular end face which extends in a direction substantially perpendicular to the shaft. The annular end face of each of the clutch members has inclined teeth that are arranged annularly around the shaft and that project axially from the annular end face. The annular end face of the second clutch member confronts the annular end face of the first clutch member.

Abstract: A hub assembly for a bicycle wheel is comprised of two spaced flanges for connection to the spokes of a wheel and a tubular center section. One flange is provided with a circular array of holes for mounting a disk brake rotor. The opposite flange is provided with an internal spline axially aligned and housed within the hub. Said spline slidably engages with a spline on a ring pawl member, which has ramped teeth on a surface facing a tubular sprocket carrier. The teeth on said ring pawl member interact with corresponding teeth on said tubular sprocket carrier to create a unidirectional clutch mechanism. Said tubular sprocket carrier is also provided with external splines to accept industry standard toothed sprockets. The clutch mechanism and bearings are arranged so as to allow a large diameter sleeve axle to fit unrestricted within the confinement of the industry standard drive sprocket's internal splines.

Abstract: A bicycle hub transmission includes a hub axle, a driver rotatably mounted to the hub axle, a slave rotatably mounted to the hub axle, a power transmitting mechanism disposed between the driver and the slave for changing a rotational speed of the driver and for communicating rotational power from the driver to the slave, a clutch mechanism for selectively engaging and disengaging the slave and the driver, and a clutch switching mechanism for controlling the operation of the clutch. The clutch switching mechanism includes an elongated weight member having a first end and a second end, wherein the second end pivots radially outwardly around the first end in response to centrifugal force created by rotation of the weight member around the hub axle. A control member is operatively coupled to the clutch mechanism and is rotatable about the hub axle between an engaging position for causing the clutch to engage the driver and the slave and a disengaging position for disengaging the driver and the slave.

Abstract: A bicycle hub transmission includes a hub axle, a driver rotatably mounted to the hub axle, and a slave rotatably mounted to the hub axle. The driver includes a first driving member and a second driving member axially aligned with the first driving member and nonrotatably coupled to the first driving member, wherein the slave is at least partially disposed within the second driving member. At least one of the first driving member and the second driving member define a housing space, and a power transmitting mechanism is disposed at least partially in the housing space for changing a rotational speed of the driver and for communicating rotational power from the driver to the slave.

Abstract: A multi-speed transmission for transmitting power between a first shaft and a second shaft which includes a plurality of gear sets, a plurality of connector gears corresponding to the plurality of gear sets and a shifting mechanism. Each gear set includes a first gear rotatably disposed about the first shaft, a uni-directional free wheeling mechanism between the first gear and the first shaft, and a second gear coupled to the second shaft. The uni-directional free wheeling mechanism permits the first gear to freely rotate about the shaft when the first gear rotates in a preselected direction relative to the rotation of the first shaft and locks the first gear to the first shaft at all other times. The first and second gears are spaced apart from one another but may be interconnected by one of the plurality of connector gears. Each connector gear is movable between an engaged position, which mutually engages the first gear and the second gear, and a disengaged position.

Abstract: A power transmission system used in connection with a vehicle power wheel of a bicycle or other vehicle which has a fixed axle and which utilizes a rotating chain sprocket engaging an endless chain for receiving an input torque and transmitting an output torque. The system includes a transmission ratio varying apparatus that is operably connected to the wheel by the endless chain. The transition ratio apparatus incorporates a drive collar fixedly secured to a sprocket and having one or more input and output drive rings. A drive body is displaceable with respect to the input and output drive rings and includes input and output pawls pivotally connected to the drive body and engageable with the input and output drive rings. A shifter housing is moveable with respect to the fixed axle cam to rotatably shift the drive body with respect to the drive ring and change the relationship between the input and output pawls and thereby vary the torque transmission ratio.

Abstract: An engagement mechanism is provided within the rear hub of a bicycle to allow drive sprockets attached to the rear hub to transmit drive motion from the crankset to the rear wheel. The assembly uses a pair of engaging face gears with saw tooth-shaped teeth to accomplish the torque transfer/freewheeling. While one gear is in a fixed axial position, the other is allowed to move axially along a helical spline. A light spring backs up this moveable gear to hold it against the other. When the moveable gear is rotated in one direction, the teeth having their faces parallel to the axis push against each other squarely, transferring the rotating motion from one to the other. Yet in the other direction of rotation, the faces of the teeth are askew to the axis forming ramps by which the fixed gear pushes the moveable gear away from it along the axis. This allows the teeth of the moveable gear to jump over the teeth of the fixed gear causing no rotating force to be transferred to the other and thus freewheeling.

Abstract: The subject invention relates to a type of hub structural improvement, comprising mainly the clutch mechanism that is composed of a clutch and the ratchet teeth of the bearing housing inside the hub; so that the whole unit can independently perform a single-direction brake function; without additional components as in conventional structures; with its high compatibility of components, only the chain wheel support has to be replaced in case of additional function of multi-step speed changes; without replacing many components as in conventional structures, which would result in higher assembling costs; under the trend of ever-changing bicycle specifications, it will reduce the change of measurements of relevant components, thus reducing the production costs.

Abstract: A free wheel rotary body structure for use in a bicycle is disclosed. It includes a free wheel kernel having a pair of axially extending ratchet pawl bearings at diametrically opposite positions relative to each other and a pair of ring grooves. The rotary body structure also includes first and second sets of one-way clutches. Each of the one-way clutches includes a c-spring and a pair of ratchet pawls. The pair of c-springs are received in the pair of ring grooves, respectively, of the free wheel kernel, and the pairs of ratchet pawls are received in the diametrically opposing pawl bearings, respectively, of the free wheel kernel. The pair of ratchet pawls in the first set of one-way clutch are of different shapes and dimensions from the pair of ratchet pawls in the second set of one-way clutch, so as to form phase difference when one of each pair of the ratchet pawls is engaged with the ratchet teeth groove of the free wheel housing.

Abstract: A switchable ratchet freewheel, under load, for multiple-gear hubs on bicycles includes a bolted pawl, a drive, a switch bush, as well as a switch ring. The switch ring, which has a positive-fit connection to the pawl, can either be lifted by a bulge on the switch bush, which acts in concert with an incline on a switch nose, provided that a small or no turning moment is conveyed, or by recesses with end faces and timing edges, which act in concert with a run-up incline on the recesses, whereby the recess enters into a short positive-fit connection with the segment of the switch nose that faces radially inward, provided that higher turning moments are present. In case the pawl is not lifted immediately, by means of the bulge acting in concert with the incline, this results in the positive fit of the recess with the switch nose, which reliably disengages the pawl bond when the run-up incline acts in concert with the timing edge.

Abstract: A free wheel body is inserted within the hub of a bicycle rear wheel while the pawls of the free wheel are temporarily held in their retracted positions by an auxiliary tool facilitating the mounting operation. The tool is constituted by a bush having a plurality of longitudinal wings which are elastically deformable. When the mounting operation has been carried out, the bush can be removed from body of the free wheel by making it slide rearwardly thereon.

Abstract: A bicycle freewheel includes an outer cylinder part, an inner cylinder part disposed radially inwardly of the outer cylinder part so that the inner cylinder part is capable of rotation relative to the outer cylinder part, and a one-way transmission disposed between the outer cylinder part and the inner cylinder part. The one-way transmission engages the inner surface of the outer cylinder part and transmits rotation between the outer cylinder part and the inner cylinder part in only one direction. The outer cylinder part includes inner and outer surfaces. The outer surface is shaped with outer concave portions and outer convex portions for supporting a plurality of gears so that the plurality of gears do not rotate relative to the outer cylinder part. The inner surface is shaped with inner concave portions and inner convex portions, wherein the outer concave portions on the outer surface form the inner convex portions on the inner surface.

Abstract: A friction device for controlling a clamping roller coupling for a drive device or for a back-pedal brake device connected to a bicycle hub can include a driving link with an ascending surface profile, at least one roll, a cage ring with cage arms, and an output link. The output link can be a brake jacket of the brake device. The brake device can be actuated by pedalling backword to tighten a friction spring on the hub axle. The friction spring can be realized as a loop spring, and a freewheel can be connected between the loop spring and the cage ring. The freewheel can include a first notch element non-rotatably connected to the cage ring, and a second notch element non-rotatably connected to the loop spring. When pedaling in the normal direction of rotation, the first and second notch elements are disengaged and torque is not transmitted to the loop spring.

Abstract: A freewheel hub for bicycles to provide propulsion by means of a plurality of sprockets when a derailleur is used. A sprocket or gear carrier transmits the rotational forces introduced to the sprockets mounted on the sprocket carrier by means of a drive sleeve, a ratchet and a pawl carrier to a hub sleeve in the direction of rotation of the drive, whereby the ratchet represents a freewheel in the opposite direction of rotation. The propulsion unit, which consists of the sprocket carrier and the drive sleeve, is divided into two parts, and can therefore be manufactured easily with regard to its driving gearings and pawl gearing.