Bicycle derailleur

Abstract

A bicycle derailleur includes a base member mountable to a bicycle frame and a cage assembly movably coupled to the base member. One or both of a motor and / or a generator system can be coupled to and movable with the cage assembly. The motor is operable to move the cage assembly. The generator system includes a generator and a generator drive system.

Description

[0001] This application is a divisional application of the patent application filed on May 5, 2022, with application number 202210478949.7 and invention title "Bicycle Gearbox". Technical Field

[0002] This application generally relates to bicycle derailleurs, including, for example, but not limited to, bicycle rear derailleurs incorporating energy harvesting systems. Background Technology

[0003] Bicycle derailleurs are typically integrated into the bicycle's drivetrain. A typical drivetrain also includes a crank assembly coupled to one or more drive sprockets. The crank assembly is operable to drive a chain that is routed or wound around one of the drive sprockets. The chain may also be routed to one of the bicycle's wheels (e.g., the rear wheel), where it may engage one or more driven sprockets. The derailleur is configured as part of the drivetrain. For example, one derailleur (e.g., the front derailleur) may be located near one or more drive sprockets, while another derailleur (e.g., the rear derailleur) may be located near a driven sprocket (e.g., near the rear wheel). The derailleur can be actuated to selectively transfer the drivetrain chain between drive sprockets and / or selectively transfer the chain between one or more driven sprockets. The bicycle chain moves from one drive sprocket to another or from one driven sprocket to another to change the gear ratio of the drivetrain. The rear derailleur may also apply tension to the chain to eliminate slack in the chain on the non-drive side of the drivetrain and maintain the required tension.

[0004] In some implementations, the rear derailleur can be wireless, electrically actuated, relying on a battery to power the motor. The battery may require periodic charging or replacement, which can be inconvenient if it discharges during bicycle use or in remote locations where locating charging stations or providing access to battery replacement is difficult. Summary of the Invention

[0005] In one aspect, one embodiment of a bicycle derailleur may include a base member mountable to a bicycle frame and a cage assembly movably coupled to the base member. The cage is movable relative to the base member in opposing first and second directions. A motor may be coupled to the cage assembly and movable with the cage assembly in opposing first and second directions. The motor is operable to move the cage assembly in opposing first and second directions. In one embodiment, the cage assembly may include a chain pulley coupled to the cage assembly in a manner rotatable about a first axis of rotation.

[0006] In another aspect, one embodiment of a bicycle derailleur may include a base member mountable to a bicycle frame and a cage assembly movably coupled to the base member. A generator system may be coupled to and movable with the cage assembly. The generator system may include a generator and a generator drive system. The generator drive system may include: a chain pulley rotatably coupled to the cage assembly about a first axis of rotation; and a generator transmission operatively coupled between the chain pulley and the generator.

[0007] In another aspect, one embodiment of a bicycle derailleur may include a base member mountable to a bicycle frame and a cage assembly movably coupled to the base member. A generator system may be coupled to and movable with the cage assembly. The generator system may include a generator and a generator drive system. The generator drive system may include: a chain pulley rotatable about a first axis of rotation in opposing first and second rotational directions; and a clutch. When the chain pulley rotates in the first rotational direction, the clutch drivably engages the chain pulley and the generator, thereby starting the generator. When the chain pulley rotates in the second rotational direction, the clutch disengages the chain pulley and the generator, thereby deactivating the generator.

[0008] In another aspect, the bicycle derailleur may include a base member mountable to a bicycle frame and a cage assembly movably coupled to the base member. A generator system may be coupled to and movable with the cage assembly. The generator system may include a generator and a generator drive system. The generator drive system may include: a chain pulley rotatable about a first axis of rotation; at least first and second pulleys rotatable about second and third axes of rotation, respectively; and a belt engaging with the first and second pulleys. In one embodiment, the first and second pulleys may have a pulley ratio greater than 1.

[0009] The various aspects and implementations of this transmission, as well as the methods for its use and assembly, offer more advantages than other transmissions and methods. For example, without limitations, the motor and / or generator system can be mounted on the cage and moved with it. If damaged, the cage (including the motor and generator system) can be replaced quickly and easily without replacing other parts of the transmission. Furthermore, the cage, which may include chain pulleys that can be engaged by the chain, provides input to the generator system and motor, which are positioned relative to each other and can move with the cage when the cage performs the following movements: (1) lateral movement during gear shifting; and / or (2) rotation to maintain tension in the chain. In this way, the assembly avoids any connection (whether electrical or mechanical) between any parts located on the cage and parts located on other parts of the transmission (which may be movable relative to each other). In addition, the generator system ensures that electricity is always available to power the motor, for example during gear shifting and / or for other activities and accessories that require electricity.

[0010] The foregoing paragraphs have been provided in a general manner and are not intended to limit the scope of the claims set forth below. Various preferred embodiments and further advantages will be best understood by referring to the following detailed description taken in conjunction with the accompanying drawings. Attached Figure Description

[0011] The objects, features, and advantages of the present invention will become apparent upon reading the following description in conjunction with the accompanying drawings, in which: Figure 1 This is a partial side view of a bicycle equipped with a rear derailleur, with the derailleur's cage assembly in a fully rotated clockwise position; Figure 2 This is a partial side view of a bicycle equipped with a rear derailleur, with the derailleur's cage assembly in a fully rotated counter-clockwise position. Figure 3 This is a top view of the rear transmission in its extreme outer position; Figure 4 This is an exterior view of one embodiment of the rear transmission, with the cage assembly of the transmission in a fully rotated clockwise position; Figure 5 This is a top view of the rear transmission in its innermost position. Figure 6 This is an exterior view of one embodiment of the rear transmission, with the cage assembly of the transmission in a fully rotated counterclockwise position; Figure 7 This is a side perspective view of the cage assembly; Figure 8 yes Figure 7 An outer view of the cage assembly shown; Figure 9 yes Figure 7 The inside view of the cage assembly shown; Figure 10 It is along Figure 8 A sectional view of the cage assembly cut along line 10-10; Figure 11 It is a 3D diagram of a chain pulley; Figure 12 It is a 3D diagram of the chain pulley axle; Figure 13 It is along Figure 8 A sectional view of the cage assembly cut along line 13-13; Figure 14 It is a 3D diagram of a tension adjustment system; Figure 15 It is along Figure 8 A sectional view of the cage assembly cut along line 15-15; Figure 16 This is a 3D view of the main printed circuit board; Figure 17 It is a 3D diagram of the motor and shift drive system; Figure 18 yes Figure 17 An exploded view of the motor and shift drive system shown in the figure; Figure 19 This is a partial side perspective view of the retainer assembly with the cover removed; Figure 20 It is along Figure 4 A sectional view of the transmission cut along line 20-20; Figure 21 It is along Figure 6 A sectional view of the transmission cut along line 21-21; Figure 22 It is a three-dimensional view of the cage axle; Figure 23 This is a 3D view of the guide nut; Figure 24 It is a 3D diagram of the lead screw and spur gear; Figure 25 It is a three-dimensional view of the crank arm; Figure 26 It is a 3D diagram of the driving element; Figure 27 It is a 3D diagram of the pin; Figure 28 It is a three-dimensional view of the transmission, in which a portion of the movable component has been cut off; Figure 29 It is along Figure 5 A sectional view cut along line 29-29 in the diagram; Figure 30This is a partial side view of another embodiment of the cage assembly; Figure 31 yes Figure 30 A reverse partial side view of the cage assembly shown; Figure 32 This is a perspective view of one embodiment of a gear equipped with a clutch; Figure 33 yes Figure 32 A perspective view of the drive component, including a portion of the clutch, is shown. Figure 34 This is a schematic diagram showing the generator and motor control system; Figure 35A and Figure 35B It is a graph showing the phase detection sequence of the generator when pedaling in the forward and reverse directions, respectively; Figure 36 It shows a series of induced voltage curves versus time for each pedal stroke; Figure 37 A side view of a bicycle with a rear derailleur is shown. Detailed Implementation

[0012] It should be understood that, as used herein, the term "a plurality of" means two or more. The term "longitudinal" as used herein refers to or relates to length or a length direction. The term "transverse" as used herein means positioned in the width direction, oriented in the width direction, or extending in the width direction. The term "connection" means a direct or indirect (e.g., with intervening members) connection or joint, without requiring the joint to be fixed or permanent, but it may be fixed or permanent. The terms "first," "second," etc., as used herein do not designate a specific component as named, but simply refer to a class of components in the order of their numerical references. This means that a component designated as "first" may later be a component of this class as "second," depending on the order in which they are mentioned. It should also be understood that the designation "first" and "second" does not necessarily mean that the two components or numerical values ​​are different, but rather that, for example, a first direction may be the same as a second direction, and each direction simply applies to different components. The terms “up,” “down,” “rear,” “front,” “front,” “rear,” “vertical,” “horizontal,” “right,” “left,” “inner,” “outer,” and their variations or derivatives refer to the exemplary bicycle 150 from the perspective of a user sitting on the exemplary bicycle 150. Figure 37 The orientation (as shown in the diagram), for example, a "middle" component or feature is closer to the vertical midplane of the bicycle extending in direction 201. The term "lateral" means not parallel. The terms "outer" and "outward" refer to a direction or feature away from the center position, such as the phrases "radially outward," "radial direction," and / or their derivatives, which refer to a deviation from the center position (e.g., Figure 2The rotation axis 152 of the chainring 3 shown is characterized. Conversely, the terms "inner side" and "inward" refer to the direction facing the center or interior location. The term "sub-assembly" refers to an assembly of multiple parts, wherein the sub-assembly can be further assembled into other sub-assemblies and / or a final assembly (such as bicycle 150).

[0013] bike: Figure 37 An embodiment of a human-powered vehicle is shown. In this embodiment, the vehicle is a possible type of bicycle 150, such as a road bicycle. Bicycle 150 has: a frame 2; handlebars 154 near the front of the frame; and a seat or saddle 156 for supporting the rider on top of the frame. Bicycle 150 has a first or front wheel 158, which is carried by a fork assembly 160 supporting the front of the frame. Bicycle 150 also has a second or rear wheel 162, which supports the rear end of the frame 2 and includes a pair of chainstays 164 connected to a pair of seatstays 165 (see also...). Figure 1 The rear end of frame 2 can be supported by a rear suspension component (such as a rear shock absorber 167). Bicycle 150 also has a drivetrain 168 with a crank assembly 166 operatively coupled via bicycle chain 4 to the rear sprocket 3 (also referred to as the driven sprocket assembly, located near the hub providing the axis of rotation for the rear wheel 162). Crank assembly 166 includes at least one (typically two) crank arms 170 and pedals 176, as well as a front chainring assembly 172 or drive sprocket assembly. A crank spindle or axle can connect the two crank arms. The crank axle defines a central axis of rotation 174 for the chainring assembly 172. The crank assembly may also include other components.

[0014] A rear derailleur (e.g., rear derailleur 180) is arranged at the rear wheel 162 to move the bicycle chain 4 to different sprockets on the chainring 3. In one embodiment, a front derailleur (or front derailleur) may be provided to move the chain 4 to different sprockets on the chain link assembly. In the illustrated embodiment, the saddle 156 is supported on the seat post 178, the end of which is received in the top of the frame seat tube of the frame 2.

[0015] exist Figure 37 The image shows the normal riding or forward movement direction 201 of the bicycle 150. Although Figure 37The bicycle 150 depicted herein is a mountain bike, but the rear derailleur or rear derailleur 180 (including the specific embodiments and examples disclosed herein, as well as alternative embodiments and examples) can be implemented on other types of bicycles. For example, and not limited to, the disclosed rear derailleur 180 can be used on road bicycles and any other type of bicycle with a derailleur. It should be understood that the various energy harvesting systems and embodiments disclosed herein can also be incorporated in any location (e.g., the front) into a derailleur with a cage assembly having rotatable wheels.

[0016] Rear transmission: refer to Figures 1 to 6 and Figure 28 The rear derailleur 180 includes a base member 5 (also referred to as a b-steering knuckle) which can be attached to the bicycle frame 2 using fasteners 10 (e.g., b-bolts). The frame 2 may include a hanger 184 that connects to the frame 2 at a joint between the rear upper fork 165 and the rear lower fork 164. The base member 5 can be attached to the hanger 184 or directly to the frame 2. The base member 5 is removably attached to the frame 2 using fasteners 10 and can pivot freely about the axis (A) of the fasteners 10. An adjusting member 11, which can be configured as a screw, is threadedly engaged with the base member and can be actuated to adjust the rotational position of the base member 5 relative to the frame 2.

[0017] The linkage mechanism 186 includes an inner link 7 and an outer link 6 having first ends 188 and 190, respectively, which are rotatably connected to the base member 5, for example, via a first shaft or pin 15 and a second shaft or pin 16. A movable member 8 (also referred to as a p-steering knuckle) is rotatably connected to the opposite second ends 194 and 196 of the inner link 7 and the outer link 6 via a third shaft or pin 17 and a fourth shaft or pin 18, respectively, such that the links 6 and 7 extend between the base member 5 and the movable member 8. Figure 29 As shown, pin 18 can be supported by a pair of bushings 103 in the movable member 8. The base member 5, movable member 8, inner link 7, and outer link 6 form a four-bar linkage, particularly a parallelogram linkage 186. In this way, the movable member 8 can be movably coupled to the base member 5. In one embodiment, the movable member 8 can move relative to the base member 5 and the frame 2 in opposite inner and outer directions. It should be understood that the movable member 8 can be movably connected to the base member 5 using other components and / or linkage mechanisms (which may or may not include one or more links) besides the disclosed linkage mechanism.

[0018] The biasing member 14 (which may be configured as a torsion spring) biases the linkage 186 clockwise or outward, for example, around the first pin 15 and the second pin 16. Figure 3 (as shown in the diagram) rotation. In one embodiment, the biasing member 14 may be coaxially arranged with the second pin 16 and has a first end engaging the base member and a second end engaging the linkage mechanism 186 (e.g., the outer link 6). The transmission may include rotational limits, such as an upper limit screw 12 and a lower limit screw 13, which are threadedly engaged with the base member 5 and respectively limit the movement of the inner link 7 and the outer link 6.

[0019] In an alternative embodiment, the biasing force of the biasing member 14 can be opposite, such that the biasing member 14 biases the linkage mechanism 186 counterclockwise or inward (see reference). Figure 3 ) rotate. During operation, chain 4 can apply a drag force to pulley 22, which may cause linkage 186 to rotate counterclockwise (e.g. Figure 3 (As shown in the diagram) rotates. In this embodiment, the biasing member 14 and the pulley 22 work together to bias the linkage 186 in the same direction. Therefore, the parallelogram linkage is biased in the same rotational direction by the biasing force applied by the biasing member 14 and the drag force applied by the chain to the pulley 22.

[0020] refer to Figures 7 to 9 The transmission 180 may include a cage assembly 9 movably coupled to a base member 5. The cage assembly 9 is movable relative to the base member 5 in opposing first and second translational directions (e.g., inner and outer). The cage assembly 9 may also be movable about a laterally extending axis B, relative to the movable member 8 and the base member 5, in opposing first and second rotational directions (e.g., clockwise and counterclockwise rotation), or in a combination of translation and rotation relative to the base member 5. Specifically, the cage assembly 9 is rotatably connected to the movable member using a fastener extending in the laterally direction and defining a rotational axis B. The cage assembly is rotatable about the axis B of the fastener clockwise to tighten slack in the chain 4, which engages with the chain sprocket 3, the upper chain pulley, and the lower chain pulley. The upper chain pulley and the lower chain pulley are rotatably connected to the cage assembly 9.

[0021] refer to Figures 5 to 9 , Figure 10 as well as Figure 13The cage assembly 9 may include one or both outer cages 24 fixed to the inner cage 25, for example using fasteners 29, 30 configured as screws, snap-fits, and / or other suitable known fixing devices. A lower chain pulley rotates on a ball bearing having an inner raceway, which is clamped between the inner cage 25 and the outer cage 24 using fasteners configured as screws 30 that screw into the inner cage 25. This connection also serves to secure the inner cage 25 to the outer cage 24. The cover 23 is secured to the outer cage 24 using a plurality of fasteners 28, shown as nine screws spaced apart around the periphery of the cover 23. The cover and outer cages define the housing 200. It should be understood that the term "housing" refers to a component capable of supporting or holding other components and may be closed or open. Therefore, the outer retainer and / or cover may each individually define the housing, or they may be combined to define housing 200. In one embodiment, the housing is closed and sealed to prevent fluid intrusion into the interior of the housing. (Reference) Figure 10 and Figure 13 The resilient sealing element 32 can be arranged in a groove 202 formed in the outer retainer 24. It should be understood that this groove can alternatively be formed in the cover. The groove 202 can define a closed loop that follows the contour of the periphery of the cover 23, and the sealing element 32 forms a fluid seal between the outer retainer 24 and the cover 23 or housing 200. In one embodiment, a fastener 29 is threaded onto the outer retainer 24 and secures the inner retainer 25 to the outer retainer 24.

[0022] like Figures 10 to 13As shown, one embodiment of the upper pulley assembly includes a sealed ball bearing assembly 33 received in a groove 204 formed in an outer cage 24 and engaged by a shoulder of an annular flange 206. A ball bearing assembly 34 is received in a groove 208 formed in a cover 23 and supported on an outer surface 210 of the housing. A pulley shaft 35 is arranged within and supported by the inner raceways of the ball bearing assemblies 33 and 34. The pulley shaft 35 has an end 212 rotatably supported by the ball bearing assembly 34, an annular shoulder 214 engaging the inner raceway and capturing the bearing assembly 34 between the shoulder 214 and the surface 210. The pulley shaft 35 includes an annular flange 216 laterally spaced from the annular shoulder 214, defining a second annular shoulder 218 that engages the inner raceway of the ball bearing 34 and captures the bearing assembly 33 between the shoulder 218 and the annular flange 206. The annular shoulders 214 and 216 face opposite directions, such that the annular shoulders restrict the axial movement of the shaft 35 in two lateral directions (inner and outer). The ball bearing assembly 33 is captured between the outer cage 24 (or the annular shoulder defined therefrom) and the annular shoulder 216 of the shaft 35. A sealing element 346 (configured as an O-ring in one embodiment) is located in a circumferential groove 220 formed inside the shaft 35 and spaced apart from the annular flange 216. This groove may alternatively be formed in the ball bearing assembly. The sealing element 346 forms a fluid seal between the pulley shaft 35 and the inner raceway of the ball bearing assembly 33, thereby preventing fluid from entering the internal space of the housing 200 defined between the cover 23 and the outer cage 24. The pulley shaft 35 may include an axially extending bore 222. This bore 222 may be threaded and threadedly engaged by a fastener 31 (shown as a screw).

[0023] refer to Figure 11 and Figure 12 The upper pulley may include a keyhole 21b, which in one embodiment has a cross-shaped notch 226. The pulley shaft 35 may be configured with a corresponding key 224, or with an insertion portion that matches a corresponding cross-shaped protrusion 35b. When the upper pulley... Figure 10 During the assembly shown, key 224 abuts against keyhole 21b and ensures a non-rotatable engagement or connection with keyhole 21b (e.g., engagement of protrusion 35b with recess 226). Chain pulley 21 includes a hub 228 having an inner surface 230 that contacts the end surface 35a of pulley shaft 35 defined between protrusions 35b. Through the abutment between key 224 and keyhole 21b, the upper chain pulley is non-rotatably and axially fixed to pulley shaft 35, allowing torque to be transmitted between the upper chain pulley and pulley shaft 35 (i.e., between protrusion 35b and recess 226) via key 224 and keyhole 21b. Figure 10As shown, the pulley shaft 35 is captured between the cover 23 and the outer retainer 24, and the chain pulley 21 is fixed to the shaft 35. Therefore, the chain pulley 21 is not captured or clamped between the inner retainer 25 and the outer retainer 24. Instead, the chain pulley 21 is cantilevered on the end of the shaft 35, which is supported by the housing 200 outside the chain pulley 21. Therefore, the inner retainer 25 may not cover the chain pulley 21 (specifically the pulley shaft 35), but can be configured to connect the inner retainer 25 to the upper pulley system (such as...). Figure 9 A gap is provided between the outer retainer 24 and the inner retainer 25 (as shown in the diagram). Therefore, to replace the chain pulley, it is not necessary to remove the inner retainer 25 from the outer retainer 24. Of course, in other embodiments, the inner retainer may cover the chain pulley.

[0024] Generator system: refer to Figures 13 to 16 , Figure 19 , Figure 30 as well as Figure 31The generator system 240 is coupled to and movable with the cage assembly 9, meaning that when the cage assembly moves relative to the moving member 8, the base 5, and the self-propelled frame 2, the generator system 240 translates and rotates together with the cage assembly 9. In other words, the generator system is fixed to the cage assembly and follows the movement path of the cage assembly. In one embodiment, the generator system 240 is arranged within a housing 200 defined by a cover 23 and an outer cage 24, and can be completely enclosed within a sealed internal cavity 242 defined between the cover 23 and the outer cage 24. The generator system 240 includes a generator 50 and a generator drive system 244, wherein the generator drive system 244 includes an input end. In one embodiment, this input end can be configured as a rotatable pulley 21 of the housing 200 (particularly the outer cage 24 and the cover 23). The pulley 21 is rotatable about a rotation axis 246. The generator drive system may further include a generator transmission 250 operatively coupled between an input end (e.g., chain pulley 21) and an output end (e.g., generator 50). The generator transmission 250 includes a first generator spur gear 37, which is non-rotatably and axially fixed to a pulley shaft 35 such that the spur gear 37 rotates together with the chain pulley 21 about a rotation axis 246. For example, but not limited to, the spur gear 37 may be fixed to the pulley shaft using a friction fit and / or a splined interface. The spur gear 37 is arranged in a space or internal cavity 242 defined between a cover and an outer retainer. The first generator spur gear 37 has a plurality of teeth 260 circumferentially spaced around its periphery, which engage with teeth 262 circumferentially spaced around the periphery of a pinion 38. The pinion 38 is rotatable about an axis 44 supported by the outer retainer 24 and the cover 23 and located between them. In one embodiment, spur gear 37 has thirty (30) teeth 260, while pinion 38 has ten (10) teeth 262, providing a 3:1 gear ratio, meaning that one rotation of spur gear 37 results in three (3) rotations of pinion 38. In one embodiment, chain pulley 21 has multiple teeth (e.g., 12). In one embodiment, shaft 44 has a first end that engages with outer cage 24 (e.g., a non-rotatable engagement, e.g., threaded), making shaft 44 non-rotatable, and its opposite second end engages with cover 23. Alternatively, shaft 44 may be allowed to rotate relative to outer cage 24. Pinion 38 includes a hub 264 that rotates on shaft 44 about axis of rotation 266. Second generator spur gear 39 is coaxially and non-rotatably attached to first generator pinions 38, 338 (particularly to hub 264) and rotates with and is driven by pinions 38, 338. In one embodiment, the spur gears 39, 339 have thirty-six (36) teeth 268 that are circumferentially spaced around the periphery of the spur gears 39, 339.The teeth 268 of the spur gear engage with teeth 270 circumferentially spaced around the periphery of the pinion 40, which is supported by and rotatable about a shaft 45, which is rotatably or non-rotatably supported and located between an outer retainer 24 and a cover 23. In one embodiment, the shaft 45 has a first end that engages (e.g., threadedly) with the outer retainer 24, making the shaft non-rotatable, and its opposite second end that engages with the housing 24. In another embodiment, the shaft is rotatably supported and located between the outer retainer 24 and the cover 23. The pinion 40 includes a hub 274 that rotates on the shaft about a rotation axis 272. The pinion may have, for example, twelve (12) teeth 270, which provides a 3:1 gear ratio between the spur gear 39 and the pinion 40, meaning that one rotation of the spur gear 39 results in three (3) rotations of the pinion 40.

[0025] The generator drive 250 further includes: at least a first pulley 41 and a second pulley 42, rotatably connected to the housing 200 about rotation axes 272 and 280, respectively; and a belt 43 that engages with the first and second pulleys. In one embodiment, the first generator pulley 41 preferably has a plurality of teeth 276 (e.g., 75 teeth 276) and is coaxially and non-rotatably fixed to the hub 274 of the pinion 40, the pulley 41 and the pinion 40 being rotatable about the rotation axis 272. The second pulley 42 has a plurality of teeth 278 (e.g., 20 teeth) and is coaxially and non-rotatably fixed to the rotor 47 of the generator 50, the pulley 42 and the rotor 47 being rotatable about the rotation axis 280. The belt 43 forms a continuous or annular loop. In one embodiment, the belt 43 may be a toothed belt having a plurality of teeth 282 formed around the inner surface of the loop. In one embodiment, the belt 43 may include, for example, but not limited to, 91 teeth 282. Belt 43 (particularly teeth 282) engages with first pulley 41 and second pulley 42 and their teeth 276, 278. Pulleys 41, 42 have a pulley ratio greater than 1; in one embodiment, the pulley ratio is 3.75:1. It should be understood that in other embodiments, belt 43 and pulleys 41, 42 may not be toothed, and belt 43 engages with pulleys 41, 42 by friction. Rotor 47 is rotatably received in a bore 284 defined by generator base 46. Generator 50 includes a stator 48 disposed around the rotor 47 or within an annular wall 286. The stator may be non-rotatably fixed to generator base 46, and rotor 47 may rotate relative to stator 48 about axis of rotation 280. In one embodiment, the chain pulley 21 (or input end) has a first rotational speed, and the generator 50 (e.g., rotor 47 or output end) has a second rotational speed, wherein the generator drive provides a ratio between the first and second rotational speeds, which is between and includes 20:1 and 50:1. In one embodiment, the overall gear ratio of the drive between the upper pulley of the generator 50 and the rotor 47 is preferably 33.75:1 (e.g., overall gear ratio = (gear ratio 1)). (Gear ratio 2) (Pulley ratio 3) = 3 3 3.75 = 33.75:1, meaning that the rotational speed of rotor 47 will be 33.75 times greater than the rotational speed of the upper pulley. It should be understood that this ratio can be varied by changing any gear ratio between spur gear 37 and pinions 38, 338; spur gear 39, 339 and pinion 40; and the first pulley 41 and the second pulley 42.

[0026] In one implementation, such as Figures 30 to 33As shown, the generator drive 250 includes a clutch 290 that drivably connects the chain pulley 21 and the generator 50 (specifically, the rotor 47) when the chain pulley 21 rotates in a first rotational direction, causing the generator 50 to start (meaning the rotor 47 rotates relative to the stator 48). When the chain pulley 21 rotates in a second rotational direction, causing the generator 50 to stop (meaning the rotor 47 does not rotate relative to the stator 48), the clutch 290 disengages the chain pulley 21 and the generator 50. In one embodiment, the clutch 290 is arranged between a spur gear 339 and a pinion 338. It should be understood that the clutch 290 can also be arranged between any coaxially mounted components, including, for example, between the chain pulley 21 and the spur gear 37 or between the pinion 40 and the pulley 41. In other embodiments, the clutch can be arranged between non-coaxially mounted components, such as a slip interface between adjacent pulleys. In one embodiment of the clutch, the pinion 338 defines a drive member rotatably supported by a shaft 44. It should be understood that the drive member can be a spur gear. In any case, the clutch 290 is arranged or mounted between the driving member (i.e., pinion 338) and the driven member (i.e., spur gear 339). In this way, the clutch 290 provides unidirectional rotational engagement between the driving member and the driven member. In one embodiment, the clutch 290 includes at least one spring finger 292, preferably multiple spring fingers (shown as two). In one embodiment, the driven member, gear, or pulley may include a hub 294 having at least one recess 296, the number of which (e.g., two) preferably corresponds to the number of spring fingers 292, but this number may vary. In one embodiment, the spring finger 292, molded in-mold with the spur gear 339, may be configured as a cantilever leaf spring having a crank arm 302 extending from the web of the spur gear 339 and terminating at an engagement end 304. When the arm 302 is in a non-biased position (i.e., without preload), the engagement end 304 is radially inwardly positioned from the inner bearing surface 306 of the driven gear or spur gear 339. By moving end 304 radially outward until it engages with the hub 294 of pinion 338 or the outer bearing surface 310 of shaft, arm 302 can be preloaded. A recess 296 is formed, extending radially inward to form bearing surface 310. In one embodiment, the recess includes: an inclined surface 298 that tapers inward from and intersects bearing surface 310; and a stop surface 300 that extends from and intersects the inclined surface 298 toward and intersects bearing surface 310. In one embodiment, the stop surface 300 is substantially orthogonal to the tangent of bearing surface 310 and its intersection, but other angles are also suitable. Due to the preload, arm 302 biases engagement end 304 into engagement recess 296 (particularly with surfaces 298 and 300).When the pinion 338 rotates relative to the spur gear 339 in one direction, the arm 302 and its end 304 will eventually engage with the stop surface 300 because the arm is radially biased inward. Subsequently, when the chain pulley 21 rotates in one direction of rotation (i.e., the pedaling direction), it drives the driven gear or spur gear 339 and the drive gear 338. When the user pedals backward, the chain 4 and chain pulley 21 rotate in opposite directions of rotation. When the arm 302 is biased and disengaged, both ends of the arm 302 slide outward successively and intermittently along the inclined surface 298, and then along the bearing surface 310, so that the drive gear or pinion 338 does not cause the driven gear or spur gear 339 to rotate. In this way, when the chain pulley 21 rotates in the first rotational direction, the spring finger 292 or the crank arm 302 is biased to engage with the recess 296 and the stop surface 300, and when the chain pulley 21 rotates in the second rotational direction, the spring finger 292 or the crank arm 302 is biased by the inclined surface 298 and the bearing surface 310 to disengage from the recess 296, thereby disabling or preventing the generator 50 from rotating.

[0027] refer to Figure 14 , Figure 15 and Figure 31 The belt tensioner 320 can be coupled to the cage assembly and is operable to adjust the tension of the belt 43. The belt tensioner 320 includes: a first fastener 51 or a first generator screw that threadedly engages with a first boss 24a formed on the outer cage 24; and a second fastener 52 or a second generator screw that threadedly engages with a second boss 24b formed on the outer cage 24. The first fastener 51 passes through an opening in the generator base 46, and the second fastener 52 passes through a washer 53 that overlaps with the edge of the generator base 46. The belt tensioner 320 further includes a belt tension adjusting member 54 that functions between the outer cage 24 and the generator 50 (particularly the base 46). In one embodiment, the adjusting member 54 can be configured as a set screw that is threadedly received in a boss 24b formed in the outer cage 24. An end 322 of the adjusting member 54 abuts against the generator base 46 (e.g., its edge). During operation, fasteners 51 and 52 are slightly loosened to adjust the tension of belt 43. Adjusting member 54 can then be actuated (e.g., via threaded engagement with upper boss 24b) to push against the edge of generator base 46, counteracting the biasing force or tension of belt 43. Base 46 can be slightly rotated about fastener 51 to generate more tension in belt 43. When the desired belt tension is reached, fasteners 51 and 52 can be tightened to fix the belt tension at the desired level. Adjusting member 54 may be provided with an anti-loosening device (e.g., a nylon patch) to prevent it from loosening over time.

[0028] refer to Figure 15 and Figure 19 Multiple generator leads 49 (three shown) extend from the generator stator 48. The generator leads 49 are electrically connected to a generator printed circuit board (generator PCB) 55, which is mounted to the housing 200. In one embodiment, the generator PCB 55 is secured to the outer retainer 24 using screws 56; however, the PCB 55 may be secured using adhesive, clips, or other suitable fasteners. The PCB 55 may alternatively be secured to a cover 23.

[0029] refer to Figure 15 , Figure 16 and Figure 19 The main printed circuit board (main PCB) 57 is secured relative to the housing 200 (e.g., cover 23) by means of a first mounting screw 80 and a second motor bracket mounting screw 78. (See reference) Figure 16 The main printed circuit board 57 includes various electronic components (including, but not limited to, an energy storage device 57d), which in one embodiment are configured as a supercapacitor, a motor driver 57f, an encoder 57e, a switch 57b, an LED 57c, multiple pogo pins 57a, and a microcontroller 402. (See reference) Figure 15 The spring pin 57a ​​of the main PCB 57 is in electrical contact with the generator PCB 55. The energy storage device 57d (e.g., a supercapacitor) is also coupled to and movable with the cage assembly 9, particularly fixed to the main PCB 57. The generator 50 generates energy, which is transferred to and stored in the energy storage device 57d. In one embodiment, the energy storage device 57d includes at least one capacitor (shown as two supercapacitors). In other embodiments, the energy storage device may include one or more batteries (e.g., rechargeable batteries).

[0030] refer to Figure 4 , Figure 8 and Figure 15Function button 19 is connected to housing 200 (specifically cover 23) via button holder 59. A resilient seal 58 is disposed between button holder 59 and the surface of cover 23 or housing 200. When a user presses function button 19, it actuates switch 57b of main printed circuit board 57. In other functions, function button 19 can be used to wirelessly pair transmission 180 with other system components (e.g., a remotely located gearshift). LED lens 20 can be a transparent lens fixed in a hole in cover 23 or holder 24 (i.e., housing 200). LED lens 20 is positioned such that LED 57c of main printed circuit board 57 illuminates through lens 20 and is visible to the user. LED 57c can be used to indicate system status. For example, and not limited to, LED 57c is used when wirelessly pairing transmission 180 with other system components (such as a gearshift). LED 57c can also be used to indicate other system statuses (e.g., battery life).

[0031] Motor and shift drive system: Figure 17 and Figure 18 A motor support assembly 79 is depicted, which includes a motor 60 coupled to a cage assembly 9 and movable in opposing first and second directions. The motor 60 is operable to move the cage assembly 9 relative to the base 5 and the frame 2 in opposing first and second directions (e.g., lateral directions, inside and outside). A shift drive system 330 is coupled between the motor 60 and a linkage mechanism 186, wherein the shift drive system includes an input terminal originating from the motor 60 and an output terminal coupled to the linkage mechanism 186.

[0032] Motor 60 (e.g., a DC motor) includes a first drive pinion 65 fixed to an output shaft 334, which defines the input to the shift drive system. Motor 60 is secured to motor bracket 61 by means of at least one fastener 62 (e.g., a pair of screws). One end of a first drive shaft 63 is received in a hole in the motor bracket 61. A first drive spur gear 66 is coaxially fixed to a second drive pinion 67 having a plurality of teeth (e.g., twenty (20)), and the first drive spur gear 66 and the second drive pinion 67 rotate together about the first drive shaft 63. The first drive pinion 65 has a plurality of teeth (e.g., twelve (12)) circumferentially spaced around the periphery of the pinion, which engage with a plurality of teeth (e.g., four eights (48)) circumferentially spaced around the periphery of the first drive spur gear 66, providing a gear ratio of 4:1. An encoder gear 71 having a plurality of teeth (e.g., 38) has a cylindrical notch in which an encoder magnet 72 is received. The encoder magnet 72 is fixed relative to the encoder gear 71. The encoder gear 71 has a long, cylindrical end that is rotatably received in a hole in the motor bracket 61. The encoder gear 71 engages with a first drive spur gear 66 and is axially held by a retaining clamp 73. (Reference) Figure 19 The motor bracket assembly 79 is secured to the cover 23 or the outer retainer 24 (i.e., the housing 200) using one or more fasteners (e.g., a first motor bracket mounting screw 77 and a second motor bracket mounting screw 78). The encoder magnet 72 is positioned adjacent to the encoder 57e on the main printed circuit board 57. Wiring electrically connects the motor 60 to the main PCB 57.

[0033] refer to Figure 19 The shift drive system 330 includes a gear support plate 74 positioned relative to the housing 200 by means of two locating pins 76 protruding from the cover 23 and held by screws 75. The gear support plate 74 supports the end of the aforementioned first drive shaft 63. The first end of the second drive shaft 64 is received in an opening in the cover 23, and the second end is supported by the gear support plate 74. A second drive spur gear 68 is coaxially fixed with a third drive pinion, and the two gears rotate together as a unit about the second drive shaft 64. The second drive spur gear 68 has a plurality of teeth (e.g., 48), which engage with a plurality of teeth (e.g., 20) on the second drive pinion 67, providing a gear ratio of 2.4:1. A third spur gear 70 having a plurality of teeth (e.g., 42) engages with a third drive pinion having a plurality of teeth (e.g., 18), providing a gear ratio of 2.33:1. In one embodiment, the shift drive system has 4 2.4 The overall gear ratio is 2.33 = 22.4:1, but other gear ratios may be appropriate.

[0034] refer to Figure 19 , Figure 20and Figure 24 The shift drive system 330 has an output end, the second rotational speed of which is less than the first rotational speed of the input end or motor 60 and shaft 334 determined by the overall gear ratio. In one embodiment, the output end is configured as a lead screw 81, which is coaxially fixed to a third spur gear 70. The lead screw 81 is rotatable in first and second opposite rotational directions and is threadedly engaged with a crank arm 92. The crank arm 92 is movable in first and second opposite axial directions in response to rotation of the lead screw 81 in the first and second opposite rotational directions. As further explained below, the crank arm 92 is connected to a connecting rod mechanism 186. In one embodiment, the lead screw 81 has partial threads along its length. A lead screw bearing 83 is received in a recess formed in a cover 23 or housing 200. An adjustable bearing 84 is threadedly received in a movable member cover 93, which is fixed to the movable member 8 by fasteners (shown as three screws 94). The lead screw 81 is radially supported near its first end by a lead screw bearing 83 and radially supported at its second end by an adjustable bearing 84. The axial thrust load of the lead screw 81 is reacted in the first direction by the thrust element 82 received in a recess in the outer retainer 24, and in the second direction by the surface of the adjustable bearing 84. The adjustable bearing 84 can be screwed into the movable member cover 93 to substantially eliminate any axial “playback” of the lead screw 81. Preferably, the adjustable bearing 84 includes a nylon locking element on its threaded portion to prevent it from shifting after being set to the desired position.

[0035] refer to Figure 7 as well as Figures 20 to 22 The cage shaft 85 is secured to the cover 23 and the housing 200 using fasteners (e.g., six screws 86). Alternatively, the cage shaft 85 may be secured to the cover 23 by overmolding or other means. (See reference) Figure 22 The cage shaft 85 has two keyed features 85a that project radially inward from the inner diameter of the cage shaft 85. The cage shaft 85 is rotatably received in a bore in a movable member 8 coaxial with axis B and axially held to the movable member 8 by means of a retaining ring 87. A thrust washer 88 is disposed between the retaining ring 87 and the surface of the movable member 8. Alternatively, the thrust washer 88 can be replaced by shims of varying thicknesses, which can be used to substantially eliminate any axial play between the cage shaft 85 and the movable member 8.

[0036] refer to Figure 20 , Figure 21 and Figure 23The guide nut 91 has a threaded inner diameter and a first end 91b, which has a spherical shape. A keyway 91a is formed as a groove along the length of the outer diameter of the guide nut 91. The threads of the guide nut 91 engage with the threads of the guide screw 81, and the keying feature 85a of the retainer-shaped shaft 85 is slidably received in the keyway 91a of the guide nut 91. The arrangement of the key and keyway prevents the guide nut 91 from rotating relative to the retainer shaft 85. Therefore, rotation of the guide screw 81 causes translation of the guide nut 91 along axis B.

[0037] refer to Figures 20 to 21 , Figure 25 , Figure 26 as well as Figure 27 The crank arm 92 has a cylindrical notch 92a, a first hole 92b, and a second hole 92c. The crank arm 92 is rotatably connected to a fourth pin 18 at the second hole 92c. The spherical end 91b of the guide nut 91 engages with the cylindrical notch 92a of the crank arm 92. The crank arm 92 includes a slot 92d that cuts through the cylindrical notch 92a and provides clearance for the elongated cylindrical portions of the guide nut 91 and the lead screw 81. Thus, the contact between the guide nut 91 and the crank arm 92 is maintained between the spherical portion 91b of the guide nut 91 and the cylindrical notch 92a of the crank arm 92; in one embodiment, contact is preferably only between these components.

[0038] refer to Figures 26 to 29 The fourth pin 18 passes through the hole 99d of the drive element 99. In one embodiment, the drive element 99 can be secured to the fourth pin 18 by means of a set screw 100, which threadedly engages with the threaded hole 99e of the drive element 99 and engages with the flat surface 18a formed on the fourth pin 18. The drive pin 97 is received in the hole 92b of the crank arm 92 and secured to the crank arm 92 by means of a set screw 104. The drive pin 97 extends into the recess 99a of the drive element 99. The protective spring sleeve 96 is a cylindrical sleeve coaxially positioned relative to the fourth pin 18. The protective spring 95 is a torsion spring, which is coaxially positioned with the protective spring sleeve 96. The first end of the protective spring 95 engages with the crank arm 92, and the second end of the protective spring 95 engages with the surface 99c of the drive element 99. The protective spring 95 rotates clockwise. Figure 20 The axis (C) shown biases the surface 99b of the drive element 99 against the drive pin 97.

[0039] refer to Figures 27 to 29 The outer link 6 is secured to the fourth pin 18 by a fastener (e.g., a set screw 101), which engages with a flat portion 18b formed on the fourth pin 18.

[0040] refer to Figure 29The fastener 102 (e.g., a screw) is threadedly engaged with the end of the fourth pin 18. The protective spring 95 is in a “free” or released state before the drive element 99 engages with the drive pin 97 disposed in the recess 99a of the drive element 99. A tool (e.g., a screwdriver) can engage the fastener 102 (e.g., by inserting the tool into the screw), subsequently actuating it to rotate the fourth pin 18 counterclockwise (as shown) about axis (C). Since the fourth pin 18 is secured to the drive element 99, the drive element (99) rotates together with the pin 18. The surface 99c of the drive element 99 biases or pushes the end of the protective spring 95, thereby loading or coiling the protective spring 95 from the “free” or released state to a preloaded state. The drive pin 97 can then slide to engage with the recess 99a of the drive element 99. The tool can be removed, and the biasing force of the protective spring 95 biases the surface 99b of the drive element 99 against the drive pin 97 clockwise about axis (C).

[0041] refer to Figure 20 The cage spring 90 is formed as a torsion spring, with its first end disposed and engaged in a recess formed in and with the movable member 8. The second end of the spring 90 engages with the cover 23 and is disposed in a recess in the cover 23. The cage spring 90 is arranged as follows: Figure 1 The cage assembly 9 is rotated in a clockwise direction around axis (B) to bring close any slack in chain 4.

[0042] Refer again Figure 20The clutch spring 89 is shown having multiple coils, for example, seven coils in one embodiment. The inner diameters of multiple first coils (e.g., about five first coils) are wound around a cylindrical surface of the movable member 8. The inner diameters of multiple second coils (or a single auxiliary coil) are wound around a cylindrical surface of the cage shaft 85, with the multiple first coils being larger than the multiple second (or auxiliary) coils. Because more coils are wound around the movable member 8, any relative rotation between the cage shaft 85 and the movable member 8 can cause slippage between the clutch spring 89 and the cage shaft 85, while the movable member 8 and the clutch spring 89 remain fixed to each other. The clutch spring 89 is wound such that when the cage shaft 85 rotates counterclockwise with the cage assembly 9 about axis (B), the drag generated by the slippage of the cage shaft 85 against the clutch spring 89 causes the coils of the clutch spring 89 to press tightly against the cylindrical surface of the cage shaft 85, which increases friction and inhibits rotation of the cage assembly 9. When the cage shaft 85 and the cage assembly 9 rotate clockwise together about axis (B), the drag generated by the cage shaft 85 against the clutch spring 89 causes the coil of the clutch spring 89 to loosen and press against the cylindrical surface of the cage shaft 85. This reduces friction and allows the cage assembly 9 to rotate more easily. The clutch spring 89 counteracts the undesirable counterclockwise rotation of the cage assembly 9 about axis (B), which can allow the chain 4 to become slack, for example, when the bicycle is riding on rough terrain.

[0043] operate: refer to Figure 1 , Figure 2 and Figure 4 When the rider pedals the bicycle, the chain rotates clockwise (reference). Figure 1 The chain 4 drives the chain sprocket 3, causing the rear wheel to rotate. Because chain 4 is also engaged with the upper pulley, the upper pulley is rotated counterclockwise (see reference). Figure 1 (Driver. Reference) Figures 10 to 13 The rotation of the upper chain pulley causes the pulley shaft 35 to rotate. Therefore, the first generator spur gear 37, which is non-rotatably fixed to the pulley shaft 35, also rotates. (Reference) Figure 13 The transmission device 250 provides rotational power from the first generator spur gear 37 to the first generator pinion 38, to the second generator spur gear 39, to the second generator pinion 40, via belt 43 to the first generator pulley 41, to the second generator pulley 42, and finally to the rotor 47 of the generator 50. The rotation of the rotor 47 relative to the stator 48 generates electrical energy. (Reference) Figure 15 and Figure 16The generated electrical energy flows via conductor 49 of generator 50 to generator PCB 55, and then via spring pin 57a ​​into main PCB 57, where it is stored in storage device 57d (e.g., a supercapacitor or battery). This storage device can then power motor 60 to enable various shifting actions. It should be understood that storage device 57d can power other electrical devices and accessories (including those located remotely to the derailleur, such as, but not limited to, wheel speed sensors, chainring speed sensors, power meters, lights, front derailleurs, adjustable seatposts, and / or other types of bicycle accessories), or it can power the motor and such auxiliary devices. In embodiments where electrical devices and accessories are located remotely to the storage device, power can be transferred via various electrical connectors (e.g., wires). In other embodiments, the energy storage device may also be located remotely to the derailleur; for example, the energy storage device may be mounted on frame 2 or another part of the bicycle assembly and connected to the generator using electrical connectors (e.g., wires).

[0044] It should be noted that the engagement of pulleys 41 and 42 with belt 43 results in less noise than an equivalent engagement of spur and pinion gears. Generally, gears rotating at relatively slow speeds do not produce noise that may be offensive to the rider, while gears rotating at high speeds (RPM) can produce loud noise that may be offensive to the rider. Therefore, in one embodiment, when the angular rate is relatively low (i.e., close to the angular rate of the upper pulley), the transmission can use gear engagement, while when the angular rate of the pulley is relatively high (i.e., close to the angular rate of rotor 47), pulley belt engagement can be used.

[0045] To request a gear shift, the rider operates the gearshift switch on the handlebars. The gearshift can emit a wireless signal. This wireless signal is received by an antenna and radio on the main PCB 57. The main PCB 57 processes this signal, and the controller provides power from a power storage device 57d (e.g., a supercapacitor) to the motor 60. (Reference) Figure 17 and Figure 19 Mechanical power originating from the input end of the motor 60 or the shift drive system is transmitted from the first drive pinion 65 to the first drive spur gear 66, to the second drive pinion 67, to the second drive spur gear 68, to the third drive pinion, to the third drive spur gear 70, and to the lead screw 81 or the output end.

[0046] When the rider requests a shift to a larger sprocket or tooth on chainring 3, power is supplied to motor 60. The rotation direction of motor 60 causes a third drive sprocket 70 and lead screw 81 to be driven in the first rotation direction via a shift drive system including drive pinion and sprockets 65-70. Lead nut 91 is threaded into lead screw, but lead nut 91 cannot rotate relative to cage shaft 85. Therefore, refer to... Figure 20 The guide nut 91 moves axially upward along axis (B). The spherical end 91b of the guide nut 91 drives the crank arm 92 to move counterclockwise about axis (C) of the fourth pin 18. (Reference) Figure 28 and Figure 29 The drive pin 97 engages with the surface 99b of the drive element 99, causing the drive element 99 to rotate counterclockwise about the axis (C) of the fourth pin 18. Since the drive element 99 is fixed to the fourth pin 18, the fourth pin 18 also rotates counterclockwise. Since the fourth pin 18 is also fixed to the outer link 6, the outer link 6 also rotates counterclockwise about the axis (C), driving the linkage mechanism 186 in the inward direction of the bicycle. The linkage mechanism 186 drives the movable member 8 and the cage assembly 9 in the inward direction. Since the chain 4 engages with the upper chain pulley of the cage assembly 9, the chain 4 is also driven in the inward direction, causing the chain 4 to shift to the larger sprocket or tooth of the chainring 3.

[0047] When the rider requests a shift to the smaller sprocket or tooth of chainring 3, power is supplied to motor 60. The rotation of motor 60 causes the third drive sprocket 70 and guide screw 81 to be driven in a second rotational direction via a shift drive system including drive pinions and sprockets 65 to 70. This drives guide nut 91 to move axially downwards along axis (B). The spherical end 91b of guide nut 91 rotates clockwise around axis (C) of fourth pin 18. Figure 21 The crank arm 92 drives the protective spring 95 clockwise about the axis (C) of the fourth pin 18. The protective spring 95 drives the drive element 99 clockwise about the axis (C) of the fourth pin 18. Since the drive element 99 is fixed to the fourth pin 18, the fourth pin 18 also rotates clockwise. Since the fourth pin 18 is fixed to the outer link 6, the outer link 6 also rotates clockwise about the axis (C), driving the parallelogram linkage 186 in the outward direction of the bicycle. The linkage 186 drives the movable member 8 and the cage assembly 9 in the outward direction. Since the chain 4 engages with the upper chain pulley of the cage assembly 9, the chain 4 is also driven in the outward direction, causing the chain 4 to deflect towards the smaller sprocket or tooth of the chainring 3.

[0048] refer to Figure 16 , Figure 17 and Figure 19The encoder 57e on the main printed circuit board 57, together with the encoder magnet (72), provides position feedback for the movable member 8, the cage assembly 9, and the chain pulley 21. The encoder gear 71 engages with the first drive spur gear 66. As the first drive spur gear 66 rotates, it causes the encoder gear 71 and the encoder magnet 72 to rotate together about the axis of the encoder gear 71. Therefore, the encoder magnet 72 rotates relative to the encoder 57e. The encoder 57e outputs a signal indicating the angular position of the encoder magnet 72 relative to the encoder 57e. During a shift operation, the encoder magnet 72 performs multiple full rotations. The controller on the main printed circuit board 57 counts the number of full rotations of the encoder magnet 72. Knowing the number of rotations of the encoder magnet 72 and its current angular position relative to the encoder 57e, the controller can calculate the current position of the movable member 8 relative to the bicycle frame 2 (and extending to the chainring 3). A predetermined shift table has multiple values, each corresponding to a gear in the transmission 180. When the encoder magnet 72 rotates during a shifting operation, the value corresponding to the current position of the movable member 8 is compared with the target value in the table, and the controller is able or operable to determine when the movable member 8 reaches its target position (i.e., the gear selected by the rider).

[0049] To establish a known relationship between the angular position value output by encoder 57e and the physical position of movable member 8, a homing routine can be performed. In this routine, transmission 180 positions crank arm 92 in a reference position and sets the corresponding angular position indicated by encoder 57e as the reference value. Figure 20 The guide nut 91 is driven downward, which drives the crank arm 92 to rotate clockwise about axis (C) until contact between the crank arm 92 and the movable member cover 93 prevents the crank arm 92 from rotating further clockwise. This is the reference position, which represents the furthest outer position the derailleur can be moved to. The corresponding position value output by the encoder 57e is established as the reference value. In one embodiment, this return routine is performed at the factory when the derailleur 180 is assembled, but the routine can also be performed after the derailleur 180 is installed on the bicycle. The return routine can also be performed even when the movable member 8 is physically prevented from moving (i.e., when the rider is not pedaling and the presence of the chain 4 prevents the movable member 8 from moving). For example, if the movable member 8 is physically prevented from moving, the outer linkage 6, the fourth pin 18, and the drive element 99 will also be prevented from moving. However, the crank arm 92 can still be rotated clockwise by winding the protective spring 95. Figure 20 The position shown is such that even if the movement of the movable member 8 is prevented, the crank arm 92 can be driven to its reference position and can be returned to its original position.

[0050] The protective spring 95 and its related components also act as a safety clutch during an impact. If the movable member 8 or the outer connecting rod 6 is subjected to an external force that pushes the movable member 8 in the inward direction, the drive element 99 will be driven counterclockwise around the axis (C). If the external force exceeds the preload of the protective spring 95, the drive element 99 will coil around the protective spring 95 to prevent excessive force from being transmitted to the guide nut 91. When the external force is removed, the protective spring 95 will unwind to its previous position.

[0051] Control system and generator input / rectification: refer to Figure 34 The schematic diagram illustrates one embodiment of the control system for generator 50, motor 60, and shift drive system 330. As described above, chain pulley 21 rotates generator 50, thereby generating alternating current (AC) voltage on each set of coils within generator 50. The coils are connected to a rectifier circuit 400 formed by diodes D1, D2, D3, D4, D5, and D6, which rectifies the voltage to direct current (DC). Generator 50 can be configured as a permanent magnet brushless generator having multiple sets (e.g., three sets) of internally connected coils (preferably in a star configuration), but a delta configuration is also possible. Generator 50 can also be constructed from any number of coils, as long as these coils are connected to the rectifier circuit 400 that generates the DC voltage. Generator 50 can also be a brushed type, which mechanically generates DC voltage. Capacitors C3 and C4 are incorporated into the circuit to achieve better impedance matching with energy storage device 57d (e.g., storage capacitors C1 and C2).

[0052] Phase induction: Diodes D7 and D8 and resistors R9 and R10 are used to sense the speed and direction of the generator 50, which can be used to determine the speed and direction of rotation of the chain pulley 21, and thus the speed and direction of rotation of the chain 4. The memory contains information about the number of teeth on each sprocket or tooth of the chainring 3. As explained above, encoder 57e provides a signal that allows the controller (e.g., microcontroller 402) to know which gear is currently indexed. Microcontroller 402 is programmed with information about the number of teeth on the chainring. If the bicycle has more than one chainring installed, the front chainring shifting system transmits the currently selected chainring to the rear derailleur 180 when changing the front chainring. Using all this information, the controller 402 on the rear derailleur 180 knows the speed of the bicycle and the speed at which the rider turns the crank. The bicycle speed and cadence information can be used to perform an automatic shifting algorithm that keeps the gear ratio at a ratio preferred by the rider. The diode anode of each diode-resistor pair is connected to the signal input on the microcontroller 402 and to the digital voltage supply Vdd via a pull-up resistor. When the voltage across a single phase of diode D7 or D8 drops below VDD, the diode conducts to ground and registers a low signal to microcontroller 402. When the phase voltage exceeds VDD, the diode does not conduct, and the signal reaching microcontroller 402 is clamped to VDD via R9 or R10. If generator 50 rotates clockwise or counterclockwise (e.g.) Figure 35A and Figure 35B As shown in the diagram, when the generator 50 rotates, the pulse sequence for each phase is different, and any change in frequency is based on how fast the generator 50 rotates, and therefore how fast the rider pedals. These sequences can be identified by the microcontroller 402 through timing. If a pulse group corresponds to forward or reverse pedaling, the microcontroller 402 can modify the charging behavior; for example, it may be desirable to disable charging or deactivate the generator (e.g., using the clutch) when pedaling backward to reduce slack in the chain 4, which could cause the chain to disengage from the sprocket. It may be desirable to allow charging only beyond a certain riding stride, and / or it may be desirable to always enable charging when not pedaling to reduce chain sag, etc. One way to determine the direction of rotation is to look at the pulses read by the microcontroller 402 from two adjacent generator coils. The phases of the L2 and L3 signals are 120 degrees (time), followed by 240 degrees, and this sequence repeats as the generator 50 rotates at a constant speed. The pulse sequence indicates the direction. For example, there's an L2 signal 120 degrees later, then an L3 signal 240 degrees later, and another L2 signal might indicate to pedal forward ( Figure 35A The L3 signal is followed by 120 degrees, then the L2 signal by 240 degrees, and then another L3 signal indicates the reverse pedaling direction. Figure 35BIn reality, the actual generator speed cannot be absolutely constant. However, since the generator rotates many times for every revolution of the crank, analyzing the relative intervals of the L2 and L3 sequences will be effective.

[0053] Charge control: refer to Figure 34The P-channel MOSFET Q2 connects and disconnects the rectified voltage from generator 50 to storage devices 57d (e.g., capacitors C1 and C2) for charging. Resistors R6, R7, and R8, along with n-channel MOSFETs Q3 and Q4, allow microcontroller 402 to control the on / off state of Q2 with a digital output. Q2 can also be set to a default state if the voltage across C1 and C2 is too low to power microcontroller 402. Microcontroller 402 senses the charge state of capacitors (C1 and C2) as a voltage using a voltage divider formed by R11 and R12. When the capacitors reach their maximum charge state, microcontroller 402 turns Q2 off; when the charge state falls below a certain threshold, Q2 turns on. Microcontroller 402 can rapidly turn Q2 on and off using pulse-width modulation or another variable duty cycle modulation scheme to regulate the effective charge rate and reduce chain pulley torque. The proportional control of the Q2 switch modulation can be implemented by the microcontroller, such that a low charge state of the storage capacitors (C1, C2) will cause Q2 to turn on at or near 100% charge rate, but a charge state near the maximum capacitor change may turn on at a very low charge rate. Modulation of the charge signal allows for a smooth transition from no charging to charging, preventing the user from experiencing abrupt torque changes. As redundancy for the microcontroller 402 to shut down Q2 when fully charged, the voltage sensing integrated circuit (IC) 408 can also deactivate Q2 if the capacitor's charge state exceeds a certain threshold voltage. The threshold voltage for the voltage monitor to deactivate Q2 is preferably slightly higher than the voltage at which the microcontroller 402 stops charging. If the integrated circuit or the microcontroller 402 issues a signal to deactivate charging, Q2 will turn off regardless of the state of other control signals. Redundant charge control is useful in situations where the microcontroller 402 cannot perform charge control functions (e.g., during microcontroller firmware updates). Additional redundant overvoltage protection for the capacitors can optionally be provided by integrated circuit (IC) U4, which can be an LM317 type parallel regulator. The integrated circuit senses the capacitor voltage. If it exceeds a safe voltage threshold, Q1 is activated, short-circuiting the capacitor to ground. This discharges the capacitor until its voltage falls below the safe threshold. The capacitors (C1, C2) are preferably electrochemical double-layer (ELDC) type, also known as supercapacitors. The schematic diagram shows two capacitors (C1, C2) connected in series, but any number of capacitors in series can be used. The number of capacitors in series should match the preferred operating voltage of the motor 60 and the open-circuit voltage of the generator 50. Capacitors 57d can also be arranged in multiple parallel and series connections to achieve different voltage and capacitance values. The capacitors (C1, C2) can be of other types, such as ceramic, electrolytic, tantalum, or future capacitor technologies. The capacitors (C1, C2) can also function as capacitors using rechargeable batteries (such as lithium-ion or lithium-polymer batteries or some future battery technologies).The function of resistors R1 and R2 is to balance the charge between the two capacitors over time, so that one capacitor does not accumulate an excess charge compared to the other.

[0054] Winding encoder: In one embodiment of the transmission 180, which is equipped with a linkage mechanism 186 actuated by a lead screw 81, the encoder 57e may need to count the number of revolutions of the sensing element (e.g., a diametrically magnetized magnet). This counting can be performed by the encoder 57e or by the microcontroller 402, recording when the encoder winding exceeds its maximum value. The absolute position of the linkage mechanism 186 is determined by moving the transmission to one end of its possible travel and detecting a stall state of the motor 60. Ideally, this motion limit detection is performed only once during manufacturing, so the encoder system must store the complete number of revolutions between power cycles of the device. In one embodiment, the transmission 180 is characterized by having a non-removable power supply 57d (capacitors (C1, C2)), meaning that the power supply cannot be suddenly disconnected.

[0055] refer to Figure 36 When the bicycle is not being ridden, the capacitor voltage may slowly drop, and may even drop to 0, due to internal leakage, balancing resistance, and the low power requirements of the microcontroller 402. When the voltage of capacitor 57d approaches the threshold voltage (e.g., 3.5V), or is slightly higher than the minimum voltage required to power encoder 57e (e.g., 3.3V), the microcontroller 402 may save the current winding count to memory. Figure 36 As shown, when the voltage of capacitor 57d begins to increase again due to the bicycle being pedaled, the microcontroller will turn on when the voltage reaches a first threshold voltage (e.g., 1.8V), and the encoder will turn on when the voltage reaches a second threshold voltage of 3.3V. At a certain voltage threshold (e.g., 3.7V) higher than the voltage at which the transmission stores the last winding count but lower than the threshold voltage (e.g., 4.2V) at which the microcontroller 402 allows a shift to occur, the microcontroller 402 will read the current encoder position and add the last known winding count to reconstruct knowledge of the transmission's absolute position. A shift can occur if the shift threshold voltage (e.g., 4.2V) is exceeded.

[0056] refer to Figure 34The circuit may include a voltage regulator 410 to provide a voltage source lower than that of the capacitor 57d, supplying the microcontroller 402, encoder 57e, motor controller, and other ICs in the circuit. The voltage regulator 410 may be integrated into the microcontroller 402 or another IC, which in turn supplies a lower voltage to other components in the circuit. The voltage regulator 410 is preferably a switching buck type, but it can also be a linear type or a buck-boost type. If the capacitor voltage does not exceed the maximum rating of the microcontroller or other IC, the voltage regulator 410 can be omitted.

[0057] Switch SW1 connects to the digital input of microcontroller 402 to provide user input to the system (such as wireless pairing functionality). More or fewer switches can be used for various user inputs.

[0058] Optional LEDs D9, D10, and D11 can be provided to indicate to the user the status of the transmission 180 (e.g., pairing status or capacitor charge status). These can be omitted. The LEDs can be configured to illuminate in various colors.

[0059] The motor driver 57f is operatively connected to the microcontroller 402 by means of appropriate control signals or sets of control signals (e.g., analog control signals, digital control signals such as I2C, SPI, UART, etc.), or it can be controlled by means of pulse width modulated digital signals.

[0060] The microcontroller 402 may include a general-purpose processor, a digital signal processor, an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), analog circuitry, digital circuitry, combinations thereof, or other processors now known or hereafter developed. The processor may be a single device or a combination of devices, for example, through shared or parallel processing.

[0061] The memory can be volatile or non-volatile. It may include one or more of read-only memory (ROM), random access memory (RAM), flash memory, electronically erasable programmable read-only memory (EEPROM), or other types of memory. The memory may be removed from the transmission 180, such as a Secure Digital (SD) memory card. In a particular non-limiting, exemplary embodiment, the computer-readable medium may include solid-state memory such as a memory card or other package housing one or more non-volatile read-only memories. Furthermore, the computer-readable medium may be random access memory or other volatile rewritable memory. Additionally, the computer-readable medium may include magneto-optical or optical media, such as magnetic disks or magnetic tapes or other storage devices. Therefore, this disclosure is considered to include any and more of computer-readable media and other equivalents and subsequent media in which data or instructions may be stored.

[0062] Memory can be a non-transitory computer-readable medium and can be described as a single medium. However, the term "computer-readable medium" includes a single medium or multiple media (e.g., centralized or distributed memory structures) and / or associated caches operable to store one or more sets of instructions and other data. The term "computer-readable medium" should also include any medium capable of storing, encoding, or carrying a set of instructions for execution by a processor or any medium that enables a computer system to perform any one or more methods or operations disclosed herein.

[0063] In alternative embodiments, dedicated hardware implementations (e.g., application-specific integrated circuits, programmable logic arrays, and other hardware devices) can be constructed to implement one or more methods described herein. Applications that may include the devices and systems of each embodiment can broadly encompass a wide range of electronic and computer systems. One or more embodiments described herein may implement functionality using two or more specific interconnected hardware modules or devices (which may communicate between and via the modules) utilizing associated control and data signals, or may implement functionality as part of an application-specific integrated circuit. Therefore, this system includes software, firmware, and hardware implementations.

[0064] The communication interface provides data and / or signal communication from the gearbox to another component of the bicycle or external device (such as a mobile phone or other computing device) and between them. The communication interface uses any operable connection to transmit data. An operable connection can be a connection in which signals, physical communications, and / or logical communications can be sent and / or received. An operable connection can include a physical interface, an electrical interface, and / or a data interface. The communication interface can be configured for wireless communication and therefore includes one or more antennas. The communication interface provides wireless communication in any format now known or later developed. Although this specification describes components and functions that may be implemented in specific embodiments with reference to particular standards and protocols, the invention is not limited to such standards and protocols. For example, standards for transmission on the Internet and other packet-switched networks (e.g., TCP / IP, UDP / IP, HTML, HTTP, HTTPS) represent embodiments of the current state of technology. These standards are regularly superseded by faster or more efficient equivalents with substantially the same functionality. Bluetooth® and / or ANT+™ standards may also be used or alternatively. Therefore, alternative standards and protocols having the same or similar functionality as the standards and protocols disclosed herein are considered their equivalents.

[0065] The communication interface is configured to send and / or receive data (such as control signals and / or commands) to and / or from bicycle components (such as the front gearbox and / or derailleur 180). This component communication interface uses any operable connection to transmit data. An operable connection can be one in which signals, physical communications, and / or logical communications can be sent and / or received. Operable connections can include physical interfaces, electrical interfaces, and / or data interfaces. The communication interface can provide wireless communication in any format now known or later developed. Although this specification describes components and functions that may be implemented in specific embodiments with reference to particular standards and protocols, the invention is not limited to such standards and protocols. For example, standards for transmission on the Internet and other packet-switched networks (e.g., TCP / IP, UDP / IP, HTML, HTTP, HTTPS) represent embodiments of the current state of technology. These standards are regularly superseded by faster or more efficient equivalents with substantially the same functionality. Therefore, alternative standards and protocols having the same or similar functionality as the standards and protocols disclosed herein are considered their equivalents.

[0066] According to various embodiments of this disclosure, the methods described herein can be implemented using software programs executable by computer systems, such as microcontrollers and circuits. Furthermore, in exemplary, non-limiting embodiments, implementation may include distributed processing, component / object distributed processing, and parallel processing. Alternatively, virtual computer system processing may be constructed to implement one or more of the methods or functions described herein.

[0067] Computer programs (also called programs, software, software applications, scripts, or code) can be written in any programming language, including compiled or interpreted languages, and can be deployed in any form, including as standalone programs or as modules, components, subroutines, or other units suitable for use in a computing environment. A computer program does not necessarily correspond to a file in a file system. A program can be stored in a portion of a file that holds other programs or data (e.g., one or more scripts stored in a markup language document), in a single file dedicated to the program, or in multiple coordinating files (e.g., a file storing one or more modules, subroutines, or portions of code). Computer programs can be deployed to execute on one or more computers located at a site or distributed across multiple sites and interconnected via a communication network.

[0068] The processes and logic flows described in this specification can be performed by one or more programmable processors executing one or more computer programs to function by manipulating input data and producing outputs. These processes and logic flows can also be performed by special-purpose logic circuits, and the device can also be implemented as special-purpose logic circuits, such as FPGAs (Field Programmable Gate Arrays) or ASICs (Application-Specific Integrated Circuits).

[0069] As used in this application, the term "circuit" means all of the following: (a) a purely hardware implementation of a circuit (e.g., an implementation in analog and / or digital circuits only); and (b) a combination of circuits and software (and / or firmware), such as (if applicable): (i) a combination of processors or (ii) a processor / software (including digital signal processors), software and memory that work together to enable a device (e.g., a mobile phone or server) to perform various functions; and (c) circuits, such as microprocessors or portions thereof, that require software or firmware to operate, even if the software or firmware is not physically present.

[0070] This definition of "circuit" applies to all uses of the term in this application (including in any claim). As a further embodiment, as used in this application, the term "circuit" will also cover implementations of a processor (or processors) or a portion thereof and its (or their) accompanying software and / or firmware, as well as other electronic components. The term "circuit" will also cover (e.g., and if applicable to a particular claim element) baseband integrated circuits or application processor integrated circuits for mobile computing devices, or similar integrated circuits in servers, cellular network devices, or other network devices.

[0071] Processors suitable for executing computer programs include, for example, general-purpose and special-purpose microprocessors, and any one or more processors of any kind of digital computer. Generally, a processor receives instructions and data from read-only memory or random access memory, or both. The fundamental elements of a computer are a processor for executing instructions and one or more storage devices for storing instructions and data. Generally, a computer also includes one or more mass storage devices (e.g., magnetic disks, magneto-optical disks, or optical disks) for storing data, or is operatively coupled to receive data from or transfer data to one or more mass storage devices (e.g., magnetic disks, magneto-optical disks, or optical disks) for storing data, or both. However, a computer does not necessarily need to have such devices. Furthermore, a computer can be embedded in another device, such as a mobile phone, a personal digital assistant (PDA), a mobile audio player, a global positioning system (GPS) receiver, or a power meter system (to name just a few). Computer-readable media suitable for storing computer program instructions and data include all forms of non-volatile memory, media, and storage devices, such as semiconductor memory devices like EPROM, EEPROM, and flash memory devices; magnetic disks, such as internal hard disks or removable disks; magneto-optical disks; and CD-ROM and DVD-ROM disks. Processors and memory can be supplemented by special purpose logic circuits, or integrated into special purpose logic circuits.

[0072] The illustrations of the embodiments described herein are intended to provide a general understanding of the structure of various embodiments. These illustrations are not intended as a complete description of all elements and features of devices and systems utilizing the structures or methods described herein. Those skilled in the art will likely discover many other embodiments upon reviewing this disclosure. Other embodiments may be utilized and derived from this disclosure, allowing for structural and logical substitutions and changes without departing from the scope of this disclosure. Furthermore, the illustrations are merely representative and may not be drawn to scale. Some scales in the illustrations may be exaggerated, while others may be minimized. Therefore, this disclosure and the illustrations should be considered illustrative rather than restrictive.

[0073] While this specification contains numerous specific details, these details should not be construed as limiting the scope of the invention or any claims that may be made, but rather as descriptions of specific features of particular embodiments of the invention. Certain features described in this specification within the context of individual embodiments may also be implemented in combination in a single embodiment. Conversely, individual features described in the context of a single embodiment may also be implemented individually or in any suitable sub-combination in multiple embodiments. Furthermore, although features may be described above as functioning in certain combinations, and even initially claimed in this way, in some cases one or more features may be removed from a claimed combination, and a claimed combination may involve sub-combinations or variations thereof.

[0074] Similarly, while the operations and / or behaviors depicted in the accompanying drawings and described herein are performed in a specific order, this should not be construed as requiring these operations to be performed in the specific order shown or sequentially, or to perform all described operations to achieve the desired result. In some cases, multitasking and parallel processing may be advantageous. Furthermore, the separation of various system components in the above embodiments should not be construed as requiring such separation in all embodiments, and it should be understood that any described program components and systems can generally be integrated together in a single software product or packaged into multiple software products.

[0075] One or more embodiments of this disclosure may be referred to herein individually and / or collectively as the "invention," merely for convenience and not intended to voluntarily limit the scope of this application to any particular invention or inventive concept. Furthermore, although specific embodiments have been illustrated and described herein, it should be understood that any subsequent arrangements aimed at achieving the same or similar purpose may supersede the specific embodiments shown. This disclosure is intended to cover any and all subsequent modifications or variations of the various embodiments. Combinations of the above embodiments, as well as other embodiments not specifically described herein, will be apparent to those skilled in the art upon review of this description.

[0076] This abstract is provided to comply with 37 CFR § 1.72(b) and is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims. Furthermore, in the foregoing detailed description, various features may be combined together or described in a single embodiment for the purpose of simplifying this disclosure. This disclosure should not be construed as reflecting an intention that the claimed embodiments require more features than expressly recited in each claim. Rather, as reflected in the appended claims, the inventive subject matter may involve fewer features than any of the disclosed embodiments. Therefore, the appended claims are incorporated into the detailed description, each claim existing independently as defining its own claim.

[0077] The above detailed description should be considered illustrative rather than restrictive, and the appended claims are understood to include all equivalents in order to define the scope of the invention. The claims should not be construed as limiting to the order or elements described unless stated otherwise. Therefore, all embodiments within the scope and spirit of the appended claims and their equivalents are claimed as part of the invention.

[0078] Although embodiments have been described for illustrative purposes, those skilled in the art will understand that various modifications, additions, and substitutions are possible without departing from the scope and spirit of this disclosure. Therefore, the above description should be considered illustrative rather than restrictive, and it should be understood that all equivalents and / or combinations of embodiments and examples should be included in this description.

[0079] Although certain parts, components, features, and methods of operation and use have been described herein in accordance with the teachings of this disclosure, the scope of this patent is not limited thereto. Rather, this patent covers all embodiments of the teachings of this disclosure that fairly fall within the scope of permitted equivalents.

Claims

1. A bicycle derailleur, the bicycle derailleur comprising: A base component that can be mounted to a bicycle frame; A cage assembly, the cage assembly being movably coupled to the base member; as well as A generator system coupled to and movable with the cage assembly, wherein the generator system includes a generator and a generator drive system, wherein the generator drive system includes a clutch and a chain pulley rotatable about a first axis of rotation in opposite first and second rotational directions, wherein when the chain pulley rotates in the first rotational direction, the clutch drivesably connects the chain pulley and the generator to start the generator, and wherein when the chain pulley rotates in the second rotational direction, the clutch disengages the chain pulley and the generator to stop the generator.

2. The bicycle derailleur according to claim 1, wherein, The generator drive system includes: a drive member mounted to the cage assembly in a manner rotatable about a second rotation axis spaced apart from the first rotation axis; and a gear rotatable about the second rotation axis, wherein a clutch is mounted between the gear and the drive member.

3. The bicycle derailleur according to claim 2, wherein, The clutch includes at least one spring finger, wherein the gear includes at least one recess, wherein the spring finger is biased to engage with the recess when the chain pulley rotates in the first rotational direction, and wherein the spring finger is biased to disengage from the recess when the chain pulley rotates in the second rotational direction.

4. A bicycle derailleur, the bicycle derailleur comprising: A base component that can be mounted to a bicycle frame; A cage assembly, the cage assembly being movably coupled to the base member; as well as A generator system, the generator system being coupled to the cage assembly and being movable together with the cage assembly, wherein the generator system includes a generator and a generator drive system, wherein the generator drive system includes a chain pulley, the chain pulley being rotatable about a first rotation axis; At least a first pulley and a second pulley, the first pulley and the second pulley being rotatable about a second rotation axis and a third rotation axis, respectively; and a belt engaging with the first pulley and the second pulley, wherein the pulley ratio of the first pulley and the second pulley is greater than 1.

5. The bicycle derailleur of claim 4, further comprising a belt tensioner coupled to the cage assembly and operable to adjust the tension of the belt.

6. The bicycle derailleur according to claim 4, wherein, The generator drive system further includes: a first spur gear fixed to the chain pulley and rotatable together with the chain pulley about a first rotation axis; a first pinion meshing with the first spur gear and rotatable about a fourth rotation axis spaced apart from the first rotation axis; a second spur gear fixed to the first pinion and rotatable together with the first pinion about the fourth rotation axis; and a second pinion meshing with the second spur gear and rotatable about a second rotation axis spaced apart from the fourth rotation axis, wherein the first pulley is fixed to the second pinion and rotatable together with the second pinion about the fourth rotation axis.

7. The bicycle derailleur according to claim 6, wherein, The generator includes a rotor fixed to the second pulley and capable of rotating together with the second pulley about the third axis of rotation.

8. The bicycle derailleur of claim 6, further comprising an energy storage device coupled to and movable with the cage assembly, wherein energy generated by the generator is stored in the energy storage device.

9. The bicycle derailleur according to claim 8, wherein, The energy storage device includes at least one capacitor.

10. The bicycle derailleur of claim 8, further comprising a motor coupled to and movable with the cage assembly, wherein the motor is electrically coupled to and powered by the energy storage device.

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