Hub assembly for bicycle wheel

Abstract

The invention relates to a hub assembly for a bicycle wheel. The hub assembly includes: a driver rotatable about a first axis for mounting to a sprocket; a hub shell rotatable about a second axis parallel to the first axis for mounting to a bicycle wheel; a transmission selectively operable according to a plurality of different gear ratios and operatively connected between the driver and the hub shell; and an electric propulsion motor connected to the hub shell via a transmission.

Description

Technical Field

[0001] The present invention relates to a hub assembly for a bicycle. Background Art

[0002] Various bicycle transmission systems are known. In performance-oriented bicycles, the transmission system traditionally comprises a front derailleur and a rear derailleur for switching the gears of the transmission system. An alternative to the derailleur is formed by a gear hub, wherein the switching of the gears is achieved by a gear shifting mechanism usually located in the rear hub. A hybrid form is known, in which a gear hub torque transmission with at least two selectable gear ratios is coupled between the rear hub and the rear sprocket. Wherein the rear sprocket can be part of a sprocket cassette, each sprocket being selectable by the rear derailleur. The gear hub can replace the front derailleur in this example. The gear hub can include a planetary gear set, wherein a clutch can be used to selectively couple two rotating members of the planetary gear set, such as a planet carrier and a ring gear.

[0003] One thing that many conventional bicycle transmission systems have in common is that upshifting and downshifting are not always possible, depending on the rider's pedaling force. In some systems, the rider is required to stop pedaling, or at least stop providing torque load to the system, to allow upshifting and / or downshifting. In addition, many conventional gear hubs are relatively heavy and inefficient. Summary of the invention

[0004] The present invention is intended to provide an improved bicycle hub assembly and wheel. More generally, the present invention is intended to overcome or improve at least one disadvantage of the prior art, or at least provide an alternative process and structure that is more effective than the prior art. In any case, the present invention is at least intended to provide a useful alternative and contribution to the prior art.

[0005] According to one aspect, a hub assembly for a bicycle wheel is provided. The hub assembly includes a driver rotatable about a first axis for mounting to a sprocket. The hub assembly includes a hub shell rotatable about a second axis parallel to the first axis for mounting to a bicycle wheel. The hub shell may, for example, include a spoke flange for mounting the hub shell to a rim via a plurality of spokes. The hub assembly includes a transmission selectively operable according to a plurality of different gear ratios and operably connected between the driver and the hub shell. Thus, the driver may drive the transmission, and the transmission may thus drive the hub shell. The hub assembly includes an electric propulsion motor connected to the hub shell via the transmission. Thus, the electric propulsion motor may drive the transmission, and the transmission may thus drive the hub shell. The transmission may include a transmission input and a transmission output, wherein the driver is connected to the transmission input to drive the transmission, wherein the electric propulsion motor is connected to the transmission input to drive the transmission, and wherein the transmission output is connected to the hub shell to drive the hub shell according to one of a plurality of gear ratios. The advantage of having the electric propulsion motor as part of the wheel hub assembly is that it is possible to provide a standalone unit to propel the bicycle, for example based on the rider's muscle power and / or electricity via the electric propulsion motor. Having the electric propulsion motor drive the transmission, for example by connecting to the transmission input, allows different gear ratios to be applied to the drive torque and / or speed provided by the electric propulsion motor.

[0006] Optionally, the hub assembly comprises a hub cavity, e.g. sealed, formed by a hub shell, the hub cavity accommodating a transmission and optionally an electric propulsion motor. Optionally, the hub shell comprises an inner part accommodating the transmission and optionally the electric propulsion motor, and an outer part for mounting to a bicycle wheel, wherein the outer part is detachably mounted to the inner part. Thus, the inner part with the transmission and the electric propulsion motor can be provided as a subassembly, which can be easily mounted into the outer part. This can, for example, allow the outer part to be easily replaced with a different outer part to apply the transmission and the electric propulsion motor to different wheels. This can, for example, allow the inner part to be easily replaced with a different inner part to provide wheels with different transmissions and electric propulsion motors.

[0007] Optionally, the wheel hub assembly includes a reduction gear located between the electric propulsion motor and the transmission input.

[0008] Optionally, the hub assembly comprises a flywheel located between the drive and the transmission input. Optionally, the hub assembly comprises a flywheel located between the electric propulsion motor and the transmission input.

[0009] Optionally, the electric propulsion motor has a stator rotationally coupled to the axle of the hub assembly, and a rotor rotatably arranged relative to the stator. Optionally, wherein the electric propulsion motor is concentric with the second axis.

[0010] Optionally, the hub assembly comprises a through shaft extending through a hollow wheel axle of the hub assembly. The hollow wheel axle may be the aforementioned wheel axle.

[0011] Optionally, the transmission comprises a planetary transmission selectively operable according to a plurality of different gear ratios.

[0012] Optionally, the wheel hub assembly includes an intermediate drive portion having an input end connected to the driver and an output end connected to the planetary transmission, wherein the intermediate drive portion extends between the intermediate drive portion output end inside the wheel hub cavity and the intermediate drive portion input end outside the wheel hub cavity.

[0013] Optionally, the planetary transmission comprises a first planetary gear set selectively operable according to a first gear ratio and a second gear ratio, and has a first clutch for switching from the first gear ratio to the second gear ratio and / or vice versa.

[0014] Optionally, the sprocket is part of a sprocket cassette or a sprocket set comprising at most ten different sprockets, in particular at most eight different sprockets, more in particular at most six different sprockets, more in particular at most four different sprockets.

[0015] Optionally, the hub assembly includes an antenna for wirelessly communicating with external components, such as a controller and / or a shifter, wherein the antenna is optionally disposed within the sealed hub cavity.

[0016] Optionally, the hub assembly comprises a controller for controlling the transmission, wherein the controller is optionally also arranged for further controlling the derailleur.

[0017] Optionally, the hub assembly includes an axle, such as the aforementioned axle, which extends longitudinally along the second axis between a drive side end proximate the drive and a non-drive side end opposite the drive side; and a torque support for supporting torque from the axle to the frame of the bicycle, wherein the torque support is optionally arranged on the drive side.

[0018] According to one aspect, there is provided a wheel for a bicycle, comprising the hub assembly as described above.

[0019] According to one aspect, a bicycle is provided, comprising a wheel and / or a hub assembly as described above.

[0020] According to one aspect, a bicycle transmission is provided, comprising a hub assembly as described above, and further comprising a crank assembly including a crank, a chain ring, and a crank transmission disposed between the crank and the chain ring, and selectively operable according to a plurality of different gear ratios.

[0021] According to one aspect, a hub assembly for a bicycle wheel is provided. The hub assembly includes: a driver rotatable about a first axis for mounting to a sprocket; a hub shell rotatable about a second axis parallel to the first axis for mounting to a bicycle wheel; and a transmission selectively operable according to a plurality of different gear ratios and operably connected between the driver and the hub shell. The second axis may correspond to a wheel axis of a bicycle wheel. The first axis and the second axis may coincide. Optionally, the driver is movable between a first extreme position and a second extreme position relative to the hub shell in a direction transverse to the second axis. The first extreme position may be a concentric position in which the first axis coincides with the second axis. And the second extreme position may be an eccentric position in which the first axis is offset from the second axis. Thus, the driver may be used to tension a chain, and / or provide slack for the chain to facilitate removal of the wheel from a bicycle frame.

[0022] Optionally, the transmission includes a continuously variable transmission (CVT) that is selectively operable according to a plurality of gear ratios within a continuous range of gear ratios. The CVT may be a ratcheting CVT, for example using a flywheel or a one-way drive module. The CVT may be used to increase the number of gear ratios available to the transmission. The CVT may be similar to the CVT disclosed in co-pending patent application PCT / EP2022 / 060920, which is incorporated herein by reference in its entirety.

[0023] Optionally, the CVT is controlled to selectively operate according to a gear ratio within a finite set of predetermined gear ratios. The finite set of predetermined gear ratios is a subset of a theoretical infinite set of gear ratios defined by a continuous range of gear ratios achievable by the CVT. The CVT may be controlled to switch between gear ratios of the finite set of predetermined gear ratios, for example between a first predetermined CVT gear ratio and a second predetermined CVT gear ratio, and so on. The finite set of gear ratios may, for example, include up to 11 different gear ratios, for example up to 5 different gear ratios. Thus, the CVT may be used as a discrete transmission, i.e. with discrete gear ratios.

[0024] Optionally, the set of finite transmission ratios may be (pre)programmed by a user.Thus, the discrete transmission ratio steps of the CVT may be (pre)programmable.

[0025] Optionally, the continuously variable transmission comprises: a first drive element connected to the driver and rotatable around a first axis; a second drive element connected to the hub shell and rotatable around a second axis, the first drive element being movable relative to the second drive element in a direction transverse to the first axis and the second axis; a coupling element disposed at a constant first radius from the first axis and a variable second radius from the second axis for transmitting torque between the first drive element and the second drive element. Alternatively, the coupling element may be disposed at a constant first radius from the second axis and a variable second radius from the first axis for transmitting torque between the first drive element and the second drive element. The coupling element is used to transmit torque between the first drive element and the second drive element. The first drive element and the second drive element are movable relative to each other in a direction transverse to the first axis and the second axis for transmitting torque at different transmission ratios. By changing the relative displacement between the first drive element associated with the first axis and the second drive element associated with the second axis, a change occurs at the variable second radius at which torque is transmitted between the first drive element and the second drive element. Therefore, various transmission ratios can be obtained between the first drive element and the second drive element. Therefore, various transmission ratios can be obtained between the input end and the output end of the CVT. CVTs can be manufactured in a relatively small overall size, with relatively few components and low mass.

[0026] Optionally, the first drive element is fixed to or integrated with the driver. Thus, the driver can move relative to the hub shell in a direction transverse to the second axis, between a concentric position where the first axis coincides with the second axis and an eccentric position where the first axis is offset from the second axis.

[0027] Optionally, the second drive element is coupled or coupleable to the hub shell.

[0028] Optionally, the hub assembly includes a flywheel located between the second drive element and the hub shell. Although the CVT may include one or more flywheels to prevent the second drive element from rotationally driving the first drive element, the hub assembly may still include an additional flywheel to improve coasting efficiency, such as for performance-oriented bicycles. The hub shell may thus be prevented from driving the drive element.

[0029] Optionally, the coupling element is coupled to the second drive element in a tangential direction and is movable relative to the second drive element in a radial direction. Thus, the coupling element can move radially relative to the second axis while remaining tangentially coupled to the second drive element. Optionally, the coupling element is coupled to the first drive element in a radial direction at a first radius from the first axis and is movable relative to the first drive element in a first tangential direction. Optionally, the coupling element can be coupled to the first drive element in a second tangential direction opposite to the first tangential direction. Thus, the coupling element can be maintained at a predetermined radial distance relative to the first axis. The coupling element can, for example, be freely movable relative to the first drive member in a first tangential direction and coupled to the first drive element relative to the first drive member in a second tangential direction. Thus, the first drive element can drive the coupling element to rotate in the first tangential direction, and the first drive element can freely move relative to the coupling element in the second tangential direction. Moreover, the coupling element can drive the first drive element to rotate in the second tangential direction, and the coupling element can freely move relative to the first drive element in the first tangential direction.

[0030] Optionally, the first drive element is pivotally movable about a pivot axis extending parallel to the first axis so as to be pivotally movable relative to the second drive element in a direction transverse to the first axis.

[0031] Optionally, the first drive element comprises a first concentric guide extending concentrically around the first axis, wherein the first concentric guide is arranged for guiding movement of the coupling element along the first tangential direction. The first concentric guide may for example be a slot provided in the first drive element, the slot extending concentrically around the first axis.

[0032] Optionally, the first concentric guide and the coupling element form or include a one-way coupling to allow movement of the coupling element relative to the first concentric guide in a first tangential direction and to prevent movement of the coupling element relative to the first concentric guide in a second tangential direction. Each coupling element may, for example, include a one-way unit arranged to be wedged between the inner and outer rings of the first concentric guide when driven in the second tangential direction.

[0033] Optionally, each coupling element comprises a wedge which can be tilted about a tilting axis between a neutral position (free movement of the coupling element relative to the first concentric guide is allowed) and a wedged position (the wedge is in wedged engagement with the first concentric guide). For example, the wedge can be wedged between two turns of the first concentric guide, for example between the inner turn and the outer turn. It will be appreciated that the neutral position and the wedged position may differ only slightly, for example by a few micrometers at the extremes. In order to adopt the neutral position, it is sufficient that the wedge is no longer in wedged engagement with the first concentric guide.

[0034] Optionally, each coupling element comprises at least one roller for activating the tilting of the wedge-shaped body from the neutral position to the wedging position.

[0035] Optionally, the first end of the wedge-shaped body is provided with a converging wedge-shaped recess for cooperating with the first roller, and the second end of the wedge-shaped body opposite to the first end is provided with a diverging wedge-shaped groove for cooperating with the second roller. Here, convergence and divergence are defined as being observed from a direction away from the center of the wedge-shaped body. Relative to the flywheel direction of the wedge-shaped body, the converging wedge-shaped recess can be arranged at the front end of the wedge-shaped body, and the diverging recess can be arranged at the tail end of the wedge-shaped body. The first roller can be arranged, for example, between the inner ring of the first concentric guide and the converging wedge-shaped recess. The second roller can be arranged, for example, between the outer ring of the first concentric guide and the diverging wedge-shaped recess. Optionally, the first roller and / or the second roller are biased, for example, elastically biased, for example, biased with a spring in the wedging direction. The first roller and / or the second roller can be biased toward the converging side of the wedging recess. This provides the advantage that the wedge body is biased in the wedging state and can be released by movement in the flywheel direction.

[0036] Optionally, the second drive element comprises a first radial guide, which extends radially at least relative to the second axis, i.e. has a radial component. The first radial guide is arranged for guiding the movement of the coupling element in a radial direction and for transmitting torque in a tangential direction. The first radial guide may comprise a radially extending groove in the body of the second drive element.

[0037] Optionally, each coupling element comprises a guide wheel for running along the first radial guide.

[0038] Optionally, the coupling element is movably (eg hingedly) connected to the second drive element to allow radial movement of the coupling element relative to the second drive element.

[0039] Optionally, each wedge-shaped body is tiltable about a tilting axis between a neutral position (which allows the coupling element to move freely relative to the first concentric guide) and a wedged position (each wedge-shaped body is wedged with the first concentric guide).

[0040] Optionally, each coupling element comprises two wedges. Optionally, each wedge of the first coupling element is tiltable about a common tilt axis between a neutral position (which allows the coupling element to move freely relative to the first concentric guide) and a wedged position (each wedge is wedged with the first concentric guide).

[0041] Optionally, the guide wheel is rotatable about a common tilting axis, wherein two wedge-shaped bodies are arranged on both sides of the guide wheel.

[0042] Optionally, the transmission is arranged for pivoting the first drive element about the pivot axis between a first extreme position and a second extreme position, for example between a concentric position in which the first axis coincides with the second axis and an eccentric position in which the first axis is offset from the second axis.

[0043] Optionally, the first drive element can be pivoted about the pivot axis to a selected position within a continuous pivot range defined between a first extreme position and a second extreme position (e.g. between a concentric position and an eccentric position), wherein the continuous pivot range is symmetrical relative to a horizontal plane passing through the pivot axis.

[0044] Optionally, the first drive element forms a central cavity for allowing the shaft to extend therethrough, wherein the pivot axis is arranged in a crossover space, which is defined as the intersection of the center when the first drive element is in a first extreme position (e.g., a concentric position) and the central cavity when the first drive element is in a second extreme position (e.g., an eccentric position). Therefore, the central cavity portion is displaced with the first drive element between either end of the pivot range (i.e., the first extreme position and the second extreme position). The overlapping area between the central cavities at either end of the pivot range defines the crossover space. It should be understood that since the first drive element can be moved transversely to the first axis and the second axis, the crossover space can extend longitudinally in a direction parallel to the first axis and the second axis. Therefore, the crossover space can be substantially cylindrical, i.e., having a constant cross-section in a plane transverse to the first axis and the second axis.

[0045] Optionally, the hub assembly comprises an actuator, such as an electric actuator, for actuating the first drive element to move relative to the second drive element in a direction transverse to the second axis, wherein the actuator is arranged in the intersection space.

[0046] Optionally, the pivot axis is arranged at the rear side of the second axis relative to the expected driving direction of the bicycle. It should be understood that the expected driving direction corresponds to the forward direction in which the user intends to ride the bicycle. The first axis and the second axis may extend transversely to the expected driving direction of the bicycle. Alternatively, the pivot axis may be arranged at the front side of the second axis.

[0047] Optionally, the hub assembly comprises a sealed hub cavity formed by the hub shell.The sealed hub cavity may be, for example, sealed against debris, preferably against dust, more preferably against liquids, such as water.

[0048] Optionally, the continuously variable transmission is located outside the sealed wheel hub cavity. In an alternative configuration, the continuously variable transmission is located inside the sealed wheel hub cavity.

[0049] Optionally, the transmission comprises a planetary transmission selectively operable according to a plurality of different gear ratios.

[0050] Optionally, the transmission comprises a planetary transmission and a continuously variable transmission. Optionally, the planetary transmission and the continuously variable transmission are connected in series.

[0051] Optionally, the transmission does not include a continuously variable transmission, but only a planetary transmission. Optionally, the transmission does not include a planetary transmission, but only a continuously variable transmission.

[0052] Optionally, the planetary transmission is arranged in the sealed wheel hub cavity. For example, the transmission may include a continuously variable transmission and a planetary transmission. The continuously variable transmission may be arranged outside the sealed wheel hub cavity, while the planetary transmission may be arranged inside the sealed wheel hub cavity.

[0053] Optionally, the wheel hub assembly includes an intermediate drive section having an input end connected to the driver and an output end connected to the planetary transmission.

[0054] Optionally, the intermediate drive section extends between an intermediate drive section output end inside the sealed hub cavity and an intermediate drive section input end outside the sealed hub cavity.

[0055] Optionally, the planetary transmission comprises a first planetary gear set selectively operable according to a first gear ratio and a second gear ratio and having a first clutch for switching from the first gear ratio to the second gear ratio and / or vice versa.

[0056] Optionally, the first planetary gear set includes a sun gear, a ring gear and a planet carrier carrying the planet gears. The first clutch can be arranged to effectively couple and decouple the planet carrier and the ring gear to each other. The first clutch can be arranged to couple and / or decouple under load. The first clutch can be similar or identical to the clutch described in WO2018 / 199757A2, WO2020 / 085911A2 or WO2021 / 080431A1, which are hereby incorporated by reference in their entirety.

[0057] Optionally, the first transmission ratio is a single transmission ratio and the second transmission ratio is a non-single transmission ratio, or vice versa. In a single transmission ratio, the output speed of the transmission is equal to the input speed of the transmission. In a non-single transmission ratio, the output speed of the transmission is different from the input speed of the transmission. The non-single transmission ratio can be a speed-up, i.e., an increase in speed from the input end to the output end of the transmission, or a speed-down, i.e., a decrease in speed from the input end to the output end of the transmission.

[0058] Optionally, the planetary transmission comprises a second planetary gear set which is selectively operable according to a third gear ratio and a fourth gear ratio and has a second clutch for switching from the third gear ratio to the fourth gear ratio and / or vice versa.

[0059] Optionally, the second planetary gear set is a ringless planetary gear set including a sun gear and a planet carrier carrying the planet gears, or the second planetary gear set is a sun gearless planetary gear set including a ring gear and a planet carrier carrying the planet gears.

[0060] Optionally, the third gear ratio is a single gear ratio and the fourth gear ratio is a non-single gear ratio, or vice versa.

[0061] Optionally, the second planetary gear set comprises a stepped planetary gear having a small radius portion and a large radius portion. The small radius portion and the large radius portion may have respective external teeth for meshing with the ring gear and / or the sun gear.

[0062] Optionally, the second planetary gear set is connected in series with the first planetary gear set.

[0063] Optionally, the wheel hub assembly includes an electric propulsion motor connected to the wheel hub shell. The electric propulsion motor may be arranged in the sealed wheel hub cavity.

[0064] Optionally, the electric propulsion motor is connected to the hub shell via a transmission.

[0065] Optionally, the wheel hub assembly includes a reduction gear located between the electric motor and the transmission input.

[0066] Optionally, the hub assembly includes a shaft extending longitudinally along the second axis between a drive side end proximate to the driver and a non-drive side end opposite the drive side; and a torque support for supporting torque from the shaft to the bicycle frame. Optionally, the torque support is arranged on the drive side. For example, the bicycle may not have a rear derailleur, for example.

[0067] Optionally, the torque support is configured to engage a derailleur bracket of a bicycle frame.

[0068] According to one aspect, a drive assembly is provided, comprising a first drive element connected to a sprocket; and a second drive element connectable to a hub shell, wherein the drive assembly is arranged for transmitting torque between the first drive element and the second drive element according to a selective transmission with a continuous transmission ratio range. Thus, the drive assembly can form a continuously variable transmission between the sprocket and the hub shell. The second drive element can in particular be releasably coupled to the hub shell. This allows replacing a conventional drive with the drive assembly.

[0069] Optionally, the first drive element is rotatable around a first axis and the second drive element is rotatable around a second axis, wherein the first drive element is movable relative to the second drive element in a direction transverse to the first axis and the second axis; wherein the drive assembly includes a coupling element, which is arranged at a constant first radius from the first axis and a variable second radius from the second axis, or at a constant first radius from the second axis and a variable second radius from the first axis, for transmitting torque between the first drive element and the second drive element.

[0070] Optionally, the coupling element is coupled to the second drive element in a tangential direction and is movable relative to the second drive element in a radial direction, wherein the coupling element is coupled to the first drive element in a radial direction at a first radius of the first axis and is movable relative to the first drive element in a first tangential direction, and wherein the coupling element is coupled to the first drive element in a second tangential direction opposite to the first tangential direction. It should be understood that any aspects, features and options described with respect to the hub assembly are also applicable to the driver assembly, and vice versa. It should be particularly understood that any aspects, features and options described with respect to the driver of the hub assembly are also applicable to the driver assembly, and vice versa.

[0071] According to one aspect, there is provided a wheel, in particular a bicycle wheel, comprising a hub assembly and / or a driver assembly as described herein.

[0072] According to one aspect, a bicycle is provided, comprising a wheel and / or hub assembly as described herein and / or a drive assembly as described herein.

[0073] According to one aspect, a transmission system for a bicycle is provided, comprising a hub assembly or a drive assembly as described herein, and further comprising a crank assembly, the crank assembly comprising a crank, a sprocket (e.g., a chain ring), and a crank transmission arranged between the crank and the sprocket, the crank transmission being selectively operable according to a plurality of different transmission ratios. The crank assembly may, for example, comprise an actuator for controlling the crank transmission. The controller may, for example, also control the transmission of the hub assembly.

[0074] Optionally, the crank assembly comprises an electric propulsion motor. The electric propulsion motor may drive a sprocket of the crank assembly, for example via a crank transmission.

[0075] It should be understood that any aspects, features and options described herein can be combined. It should be particularly understood that any aspects, features and options described for the hub assembly are also applicable to the drive assembly, wheel, bicycle and transmission system, and vice versa. BRIEF DESCRIPTION OF THE DRAWINGS

[0076] Embodiments of the present invention will now be described in detail with reference to the accompanying drawings, in which:

[0077] Figure 1A and Figure 1B An example of a hub assembly is shown;

[0078] Figure 2A and Figure 2B An example of a hub assembly is shown;

[0079] Figure 3A and Figure 3B An example of a continuously variable transmission is shown;

[0080] Figure 4A-4D An example of a continuously variable transmission is shown;

[0081] Figure 5A-5C An example of a hub assembly is shown;

[0082] Fig. 6A and Figure 6B An example of a hub assembly is shown;

[0083] Fig. 7A and Figure 7B An example of a hub assembly is shown;

[0084] Fig. 8A and Figure 8B An example of a hub assembly is shown;

[0085] Fig. 9A and Fig. 9B An example of a hub assembly is shown;

[0086] Fig. 10A and Fig. 10B An example of a hub assembly is shown;

[0087] Fig.11A An example of a driver assembly is shown;

[0088] Fig. 11B An example of a hub assembly is shown;

[0089] Fig.12 An example of a bicycle is shown. DETAILED DESCRIPTION

[0090] Figure 1A and Figure 1BA schematic example of a hub assembly 1000 for a bicycle wheel is shown. The hub assembly 1000 comprises a hub shell 20 for mounting to a driven wheel of a bicycle. In this example, the hub shell 20 comprises spoke flanges 21 for mounting spokes of the wheel thereto. The hub shell 20 is rotatable about a second axis A2, which here corresponds to the axis of rotation of the bicycle wheel. The hub assembly 1000 here also comprises an axle 40 extending longitudinally along the second axis A2. The axle 40 can be mounted to a frame of a bicycle.

[0091] The hub assembly 1000 further comprises a driver 10 connected to the sprocket 3. The driver 10 is rotatable about a first axis A1. The first axis A1 and the second axis A2 are parallel to each other. The first axis A1 and the second axis A2 may, for example, coincide.

[0092] The hub assembly 1000 also includes a transmission 30 operatively connected between the driver 10 and the hub shell 20. The user can drive the driver 10 (e.g., via the sprocket 3) to rotate about the first axis A1, wherein the transmission 30 transmits torque from the driver 10 to the hub shell 20, thereby driving the hub shell 20, and in turn driving the bicycle wheel to rotate about the second axis A2. The sprocket 3 can be engaged with a chain, a belt, or a universal joint, for example, to transmit torque from the crank and the front chain ring of the bicycle to the driver 10.

[0093] The transmission 30 in this example includes a continuously variable transmission (CVT) 403. The CVT is specifically a ratchet type. Figure 3A and Figure 3B Schematically shows Figure 1A and Figure 1BA plan view of a CVT 403 used in the example. The CVT 403 comprises a first drive element 410 (forming here the input end of the CVT 403) and a second drive element 420 (forming here the output end of the CVT 403). The first drive element 410 is rotatable about a first axis A1. The second drive element 420 is rotatable about a second axis A2. The torque can be transmitted from the first drive element 410 to the second drive element 420 via a coupling element 411. The coupling element 411 is arranged concentrically with respect to the first axis A1 at a constant first radius R1 from the first axis A1. The first drive element 410 and the second drive element 420 are movable relative to each other in a direction transverse to the first and second axes A1, A2, for example translatable or pivotable, for example for providing an offset between the first axis A1 and the second axis A2. The torque can be transmitted from the first drive element 410 to the second drive element 420 via the coupling element 411 at a variable second radius R2 from the second axis A2, or vice versa. Therefore, torque can be transmitted from the constant first radius R1 to the variable second radius R2. Therefore, various ratios between the first radius R1 and the second radius R2 can be obtained according to the offset between the first drive element 410 and the second drive element 420, thereby generating various transmission ratios between the first drive element 410 and the second drive element 420.

[0094] The wheel hub assembly includes an actuator 450, such as an electric actuator, for driving the first drive element 410 to move relative to the second drive element 420 in a direction transverse to the second axis A2.

[0095] Here, the first drive element 410 is associated with the driver 10, such as being integrated with the driver 10. Likewise, here, the second drive element 420 is associated with the hub shell 20, such as being integrated with the hub shell 20. It should be understood that it is also possible that the first drive element 410 is associated with the hub shell 20, such as being integrated with the hub shell 20, and the second drive element 420 is associated with the driver 10, such as being integrated with the driver 10. In this example, the driver 10 can be moved relative to the hub shell 20 in a direction transverse to the first and second axes A1, A2, thereby changing the transmission ratio of the CVT 403 acting between the driver 10 and the hub shell 20. Figure 1A The drive 10 is shown, here integrated with a first drive element 410 of a CVT 403, in a concentric position relative to the hub shell 20, here integrated with a second drive element 420 of the CVT 403. In the concentric position, the first axis A1 coincides with the second axis A2. In the concentric position, the CVT 403 operates according to a single transmission ratio (i.e., a 1:1 ratio). The drive 10 can be adapted from Figure 1A The concentric position shown is moved to Figure 1BThe eccentric position shown relative to the hub shell 20. In the eccentric position, the first axis A1 is offset from the second axis A2. In the eccentric position, the CVT 403 operates according to a non-single transmission ratio (particularly a step-up ratio).

[0096] Although CVT 403 may include one or more flywheels to allow for coasting, hub assembly 1000 may include, for example, additional flywheels 23 to improve coasting efficiency.

[0097] Figure 2A and Figure 2B Similar to Figure 1A and Figure 1B , but differs in that more than one sprocket 3 is included, in this example three sprockets 3.1-3.3 of different sizes are included. Figure 2A , 2B In the example of CVT 403, sprockets 3.1-3.3, driver 10 and first drive element 410 are integrated. The additional sprockets increase the available transmission ratio range. A derailleur may be provided to switch the chain from one sprocket to another. Figure 1A and Figure 1B In the example of FIG. 1 , the derailleur may be omitted.

[0098] Special References Figure 3A and Figure 3B , the coupling element 411 is movable in a tangential direction relative to the first drive element 410. The first drive element 410 in this example includes a first concentric guide 412, which extends concentrically around the first axis A1 with a first radius R1. The tangential movement of the coupling element 411 around the first axis A1 is guided by the concentric guide 412. The concentric guide 412 prohibits radial movement of the coupling element 411 relative to the first axis A1 to maintain a constant first radius R1 of the coupling element 411 from the first axis A1. Therefore, the coupling element is radially coupled to the first drive element 410 relative to the first axis A1.

[0099] The coupling element 411 may be tangentially coupled to the first drive element 410 relative to the first axis A1. To this end, in this example, the coupling element 411 and the first concentric guide 412 form or include a one-way coupling. The one-way coupling is arranged to allow tangential movement of the coupling element 411 relative to the first concentric guide 412 in one direction, and to prevent tangential movement of the coupling element 411 relative to the first concentric guide 412 in another opposite direction. Therefore, the first drive element 410 can drive the coupling element 411 to rotate around the first axis A1 in one direction, while allowing the coupling element 411 to freely rotate relative to the first drive element 410 in another direction.

[0100] Furthermore, the coupling element 411 is movable relative to the second drive element 420 in a radial direction relative to the second axis A2. In a tangential direction relative to the second axis A2, the coupling element 411 is coupled to the second drive element 420. The second drive element 420 particularly comprises radial guides 413, such as radial grooves, which extend radially relative to the second axis A2. Here, the radial guides 413 are evenly and angularly spaced from each other. The coupling element 411 is guided by the radial guides 413 in a radial direction relative to the second axis A2.

[0101] In this example, the CVT 403 includes four coupling elements 411 associated with four corresponding radial guides 413, but it should be understood that the CVT 403 can include other numbers other than four radial guides 413, such as 3, 5, 6, 7, 8, 12, 16. Similarly, the CVT 403 can include other numbers other than four coupling elements 411, such as 3, 5, 6, 7, 8, 12, 16.

[0102] By moving the first drive element 410 relative to the second drive element 420 in a direction perpendicular to the first and second axes A1, A2, the distance between the first and second axes A1, A2 can be changed. Therefore, the radius of the transmitted torque can be changed.

[0103] exist Figure 3A and Figure 3B In the example of , torque is transmitted from the first drive element 410 to the second drive element 420 . Figure 3A and Figure 3B Two relative angular positions of the first drive element 410 and the second drive element 420 are shown, with the same offset between the first axis A1 and the second axis A2. If the first drive element 410 is driven in rotation about the first axis A1 in a driving direction (e.g., counterclockwise in this case), the coupling elements 411 are entrained in the rotation of the first drive element 410, so that torque can be transmitted from the first drive element 410 to the second drive element 420. If the first drive element 410 is driven in the driving direction, all coupling elements 411 are forced to move with the first drive element 410 at a circumferential speed that is at least equal to the circumferential speed of the first concentric guide 412. If the first drive element 410 is driven in the driving direction, at least some of the coupling elements 411 can move at a circumferential speed that is higher than the circumferential speed of the first concentric guide 412. If the first drive element 410 is rotationally driven about the first axis A1 in a non-driving direction opposite to the driving direction (e.g., clockwise in this example), idling of the coupling element 411 is allowed, so that no torque is transmitted from the first drive element 410 to the second drive element 420. In the driving direction of the first drive element 410, at least one coupling element 411 transmits torque by being tangentially coupled to the first drive element 410.

[0104] Specifically, at a certain point in time, only one coupling element 411 transmits torque from the first drive element 410 to the second drive element 420 by tangentially coupling to the first drive element 410. Only one coupling element 411 is radially coupled to the first drive element 410 through the concentric guide 412, and is tangentially coupled to the second drive element 420 through the radial guide 413. The coupling element with the smallest second radius from the second axis A2 among the coupling elements 411 transmits torque. The coupling element is tangentially coupled to the first drive element 410, specifically, through unidirectional coupling of the coupling element 411 and the concentric guide 412. The coupling element that transmits torque has the lowest tangential speed among the coupling elements 411. The other coupling elements have a larger second radius R2 from the second axis A2, and therefore have a larger tangential speed, surpass the concentric guide 412 in the tangential direction, and therefore do not transmit torque.

[0105] The second radius R2 of the second axis A2 for transmitting torque can be changed by an offset of the first and second axes A1 , A2 .

[0106] Figure 3B The situation where the minimum second radius R2 is the same for coupling elements 411A and 411 B is shown. This situation constitutes the intersection point where coupling element 411A has just started to transmit torque and coupling element 411B has just stopped transmitting torque.

[0107] The CVT 403 can be programmed to operate at any ratio within a continuous CVT ratio range. In this example, the CVT 403 can operate at any ratio within a continuous range of 1 to about 1.7, such as 1 to about 1.5. However, other ranges are contemplated. The CVT 403 can be controlled to selectively operate at a preprogrammed set of two, three, four, five or more different ratios within the range.

[0108] The first drive element 410 can be pivoted between a concentric position in which the first and second axes A1, A2 coincide and an eccentric position in which the first and second axes A1, A2 are offset. The first drive element 410 can be pivoted about a pivot axis 426. The pivot axis can be arranged at a fixed distance from the second axis A2.

[0109] Figure 4A-4D A cross-sectional view of the hub assembly 1000 in a plane transverse to the second axis A2 is schematically shown, and in particular a cross-sectional view of the movable first drive element 410 of the CVT 403 relative to the second axis A2. The hub assembly 1000 is shown to include a shaft 40 extending along the second axis A2. The force F may be as follows Figure 4A-4D, thereby generating a torque about the first axis A1. In this example, the torque drives the first drive element 410 in a clockwise rotational direction. The force F may be applied by a chain or belt engaged with the sprocket 3, for example, the sprocket 3 is fixedly mounted on the first drive element 410. In this example, the direction of the force F shown corresponds to the intended driving direction of the bicycle.

[0110] exist Figure 4A-4D In the example of FIG. 4 , the first drive element 410 can pivot about a pivot axis 426 . Figure 4A and Figure 4C The first drive element 410 is shown in a concentric position, wherein the first and second axes A1 , A2 are aligned. In the concentric position, the torque transmission from the first drive element 410 to the second drive element 420 is performed according to a single gear ratio. Figure 4B and Figure 4D The first drive element 410 is shown in an eccentric end position, wherein the first axis A1 is offset from the second axis A2. The first drive element 410 can be selectively positioned at any position within a continuous pivot range of positions 428, which is defined by Figure 4A and Figure 4C The concentric position shown is Figure 4B and 4D The continuous pivot range is indicated by the double arrow 428. In this example, the pivot axis 426 is offset from a plane 431 passing through the second axis A2, which extends parallel to the intended drive direction. Figure 4A-4D In the example of the embodiment of the present invention, the pivot axis 426 is located below the plane 431, but it should be understood that the pivot axis 426 can also be located above the plane 431. It should also be understood that the pivot axis 426 can alternatively be located in the plane 431. In this example, the continuous pivot range 428 is symmetrical with respect to a plane 429 passing through the pivot axis 426, which plane 429 extends parallel to the intended driving direction. The plane 429 is actually a horizontal plane.

[0111] exist Figure 4A and Figure 4B In the example of , the pivot axis 426 is located in front of the first axis A1 relative to the intended driving direction. Therefore, in this example, the first drive element 410 is pivoted from the concentric position to the eccentric position in a direction substantially opposite to the direction of the torque caused by the force F on the first drive element 410. Figure 4C and Figure 4D In the example of FIG. 4 , the pivot axis 426 is located behind the first axis A1 relative to the intended drive direction. Therefore, in this example, the first drive element 410 pivots from a concentric position to an eccentric position, the direction of which substantially corresponds to the direction of the torque caused by the force F on the first drive element 410 .

[0112] The first drive element 410 forms a central cavity 435, here a circular central cavity, for allowing the shaft 40 to extend therethrough. The intersection space 436 is defined as the intersection of the central cavity 435 when the first drive element 410 is in a concentric position and the central cavity 435 when the first drive element is in an eccentric position. Figure 4B and Figure 4D , the circular central cavity 435 here can be moved between a concentric position and an eccentric end position. The overlapping area between the central cavities 435 at both ends of the pivot range defines a crossover space 436. It should be understood that since the first drive element 410 can move transversely to the first and second axes A1, A2, the crossover space 436 can extend parallel to the first and second axes A1, A2. Therefore, the crossover space 436 can be generally cylindrical, that is, it has a constant cross-section in a plane transverse to the first and second axes. The hub assembly includes an actuator 450, such as an electric actuator, for actuating the first drive element 410 to move relative to the second drive element 420 in a direction transverse to the second axis A2. The actuator 450 is located in the crossover space 436 in this example. The actuator 450 is particularly arranged here to pivot the first drive element 410 around the pivot axis 426. In this example, the actuator 450 is coupled to the shaft 40 to support torque thereon.

[0113] Figure 5A , Figure 5B and Figure 5C An example of a wheel hub assembly 1000 is shown, which includes Figure 1A , Figure 1B , Figure 2A and Figure 2B The CVT 403 is similar to the CVT 403 shown in FIG. Figure 5B In the example of FIG. 1 , the assembly 1000 comprises two sprockets 3.1 and 3.3, which here have 34 and 14 teeth respectively, instead of Figure 2B The three sprockets shown in the example. The assembly 1000 comprises in this example another transmission, here a planetary transmission including a first planetary gear set 100. The CVT 403 is connected in series to the first planetary gear set 100. The planetary gear set 100 can increase the gear range that can be obtained by the hub assembly 1000. The first planetary gear set 100 is arranged in a sealed hub cavity 19 formed by the hub shell 10. The sealed hub cavity 19 can be sealed against debris, preferably against dust, and more preferably against liquids, such as water. The CVT 403 is arranged here outside the sealed hub cavity 19. An intermediate drive section 300 connects the CVT 403 with the first planetary gear set 100. The intermediate drive section 300 extends between an input end connected to the CVT 403 and an output end connected to the first planetary gear set 100, wherein the input end is outside the sealed hub cavity 19 and the output end is inside the sealed hub cavity 19.

[0114] The first planetary gear set 100 comprises in this example a sun gear 101, a planet carrier 102 carrying planetary gears 103, and a ring gear 104. The intermediate drive part 300 is connected to the ring gear 104 at its output end. Therefore, the ring gear 104 forms the input end of the first planetary gear set 100 in this example. The output end of the first planetary gear set 100 is formed by the planet carrier 102 connected to the hub shell 10. The planetary gear set 100 can be operated according to two different gear ratios in this example, including a single gear ratio and a non-single gear ratio, such as a reduction ratio. The clutch 105 is arranged to switch between the two gear ratios of the planetary gear set 100. An electromechanical actuator 106 can be provided to operate the clutch 105. The clutch 105 can be particularly arranged to switch between a coupled state and a decoupled state under load. The clutch 105 may be, for example, a clutch as described in WO2018 / 199757A2, WO2020 / 085911A2 or WO2021 / 080431A1, all of which are incorporated herein by reference. The first planetary gear set 100 may operate in a single transmission ratio in the coupled state of the clutch 105, thereby effectively coupling the ring gear 104 rotationally to the planet carrier 102. The sun gear 101 may idle around the shaft 40 via the flywheel 107. The first planetary gear set 100 may operate in a non-single transmission ratio, for example, in the disengaged state of the clutch 105, the reduction ratio is less than 1. In the disengaged state, the ring gear 104 and the planet carrier 102 may rotate at different speeds around the second axis A2. In the disengaged state, the sun gear 101 is coupled to the shaft 40 via the flywheel 107.

[0115] Specifically, if Figure 5A The hub assembly 1000 shown includes a single sprocket, CVT 403 and first planetary gear set 100, which can provide a complete set with six different gears for a bicycle, for example. The front derailleur can be omitted. Table 1 shows Figure 5A Examples of achievable gear ratios of the hub assembly 1000 are shown, where R_1 represents the gear ratio of the first planetary gear set 100 and R_CVT represents the gear ratio of the CVT 403 .

[0116] Table 1

[0117] R_1 R_CVT System transmission ratio Stepover 0.63 1.00 0.63 0.63 1.17 0.74 1.17 0.63 1.36 0.86 1.16 1.00 1.00 1.00 1.16 1.00 1.18 1.18 1.18 1.00 1.39 1.39 1.18

[0118] Thus a six-speed transmission is obtained. Table 2 shows the Figure 5A Another example of gear ratios that may be achieved with hub assembly 1000 is shown for achieving a five speed transmission.

[0119] Table 2

[0120] R_1 R_CVT System transmission ratio Stepover 0.63 1.00 0.63 0.63 1.28 0.81 1.29 1.00 1.00 1.00 1.23 1.00 1.20 1.20 1.20 1.00 1.39 1.39 1.16

[0121] The CVT 403 can be pre-programmed to switch between different gear ratios within its continuous gear ratio range (as shown in the table above). Alternatively, the CVT can sweep its continuous gear ratio range, providing a smooth change of gear ratio between the steps of the first planetary gear set 100.

[0122] Tables 3 and 4 show Figure 5B Two examples of gear ratios achievable with hub assembly 1000 are shown in FIG.

[0123] Table 3

[0124]

[0125] Table 4

[0126] Thus, 12-speed and 16-speed gear ratios are available, respectively. Figure 5B An example includes two sprockets, one with 34 teeth and the other with 14 teeth. The change from sprocket 3.1 (here with 34 teeth) to sprocket 3.3 (here with 14 teeth) increases the system ratio range available for hub assembly 1000 by 2.43 times. A derailleur can be used to switch a chain or belt between sprockets.

[0127] Table 5 shows the Figure 5C An example of the gear ratios achieved with a hub assembly 1000 is shown having three sprockets, specifically a 34-tooth sprocket, a 24-tooth sprocket, and a 14-tooth sprocket.

[0128] Table 5

[0129]

[0130] Thus, a 16-speed transmission is obtained, with a step size of approximately 12% between successive gear ratios. Figure 5B Compared to the exemplary hub assembly 1000 of FIG. 1 , the additional 24-tooth sprocket provides an intermediate step in the relatively large step between the 14-tooth and 34-tooth sprockets. This facilitates chain shifting between the sprockets.

[0131] Table 6 provides another approach that can be performed similar to Figure 5A-5C An example of a gear ratio obtained with the example hub assembly 1000 includes a 24-tooth sprocket and a 14-tooth sprocket.

[0132] Table 6

[0133] It should be understood that the ratios in the above table are given by way of example only and other ratios are also contemplated.

[0134] Apart from Figure 5B and Figure 5C In addition to the two or three speed sprocket cassette ratios shown, the system ratio range available to the hub assembly 1000 may be increased by providing another transmission, such as a second planetary gear set 200 connected in series with the first planetary gear set 100 . Fig. 6A and Figure 6B An example of such a hub assembly 1000 is shown. Fig. 6A and Figure 6B An example of a hub assembly 1000 is shown, in which the planetary transmission includes a second planetary gear set 200 in addition to the first planetary gear set 100. The second planetary gear set 200 is connected in series with the first planetary gear set 100. In this example, the output of the second planetary gear set 200 is connected to the input of the first planetary gear set 100. It is understood that the order can be reversed, that is, the output of the first planetary gear set 100 is connected to the input of the second planetary gear set 200. The first and second planetary gear sets 100, 200 are arranged in a sealed hub cavity 19. In this example, the hub assembly 1000 does not include a CVT 403. Fig. 9A and Fig. 9B An example of a hub assembly 1000 is shown, which is similar to Fig. 6A and Figure 6B The hub assembly 1000 shown in FIG. 1 also includes a CVT 403 .

[0135] exist Fig. 6A , 6B In the example of FIG. 1 , the second planetary gear set 200 is a sunless planetary gear set 200, including a planet carrier 202 carrying planetary gears 203 and a ring gear 204. The second planetary gear set 200 does not include a sun gear. Alternatively, the second planetary gear set 200 may be ringless, including a planet carrier 202 carrying planetary gears 203 and a sun gear 201, but not including a ring gear.

[0136] The planet carrier 202 is fixedly mounted on the shaft 40. The planet gear 203 is a stepped planet gear 203 having two rotationally coupled parts of different radius. Here, the small radius part of the stepped planet gear 203 is connected to the ring gear 204 of the second planetary gear set 200, while the large radius part of the stepped planet gear 203 is connected to the ring gear 104 of the first planetary gear set 100. Therefore, here, the second planetary gear set 200 provides a non-single gear ratio, in particular, an overdrive gear ratio. The second planetary gear set 200 also provides a single gear ratio.

[0137] The second planetary gear set 200 comprises a clutch 205, which is arranged for switching between two gear ratios of the second planetary gear set 200. The clutch 205 may be similar or identical to the clutch 105 of the first planetary gear set 100. An electromechanical actuator 206 may be provided to operate the clutch 205. As with the clutch 105, the clutch 205 may be particularly arranged for switching between a coupled state and a decoupled state under load. The clutch 205 is arranged to effectively rotationally couple the driver 10 and / or the intermediate drive part 300 coupled to the driver 10 to the ring gear 204 of the second planetary gear set 200. The driver 10 and / or the intermediate drive part 300 are coupled to the ring gear 104 of the first planetary gear set via a flywheel 207. In the coupled state of the clutch 205, the driver 10 and / or the intermediate drive part 300 and the ring gear 204 are rotationally coupled, resulting in an overspeed of the flywheel 207 when the rotation of the driver 10 about the first axis A1 is transmitted to the ring gear 104 via the stepped planetary gear 202. In the disengaged state of the clutch 205, torque is transmitted from the driver 10 and / or the intermediate drive part 300 to the ring gear 104 through the flywheel 207. In the disengaged state of the clutch 205, the flywheel 207 allows sliding to prevent the hub shell 20 from driving the driver 10 when the user does not apply torque to the driver 10.

[0138] The hub assembly 1000 may include an axially movable sprocket cassette instead of a derailleur. Fig. 6A The example of FIG. 1 shows an example in which the sprocket boxes (here three) 3.1-3.3 can be moved axially relative to the driver 10. Thus, a bicycle without a derailleur can be obtained.

[0139] Fig. 6A and Figure 6B Two corresponding positions of the planetary transmission on the shaft 40 are shown. Fig. 6A In the example of , the planetary transmission including the first planetary gear set 100 and the second planetary gear set 200 is axially spaced apart from the sprocket box 3.1-3.3. Figure 6B In the example of , the planetary transmission is arranged partially below the sprocket box 3.1-3.3. Figure 6B In the example shown, the planetary transmission and the sprocket box 3.1-3.3 partially overlap in the axial direction.

[0140] Fig. 7A and Figure 7B The examples are similar to Fig. 6A and Figure 6B The example shown in . Fig. 7A , Figure 7B The second planetary gear set 200 includes a reduction gear ratio instead of Fig. 6A , Figure 6BTherefore, here, the small radius portion of the stepped planetary gear 203 is connected to the ring gear 104 of the first planetary gear set 100, and the large radius portion of the stepped planetary gear 203 is connected to the ring gear 204 of the second planetary gear set 200. Fig. 7A and Figure 7B In the example of , the clutch 205 is arranged to couple and decouple the ring gear 204 with the ring gear 104. Here, in the coupled state, the ring gears 104, 204 are rotationally coupled to each other, thereby providing a single gear ratio for the second planetary gear set 200. In the decoupled state, the ring gears 104, 204 are rotationally decoupled, thereby allowing relative rotation therebetween. In the decoupled state, torque is transmitted from the ring gear 204 to the ring gear 104 via the stepped planetary gears 203, thereby providing a non-single, here reduced gear ratio for the second planetary gear set 200. In this example, the flywheel 207 is arranged between the planet carrier 202 and the shaft 40. In the coupled state of the clutch 205, the flywheel 207 is overspeeded to allow the planet carrier 202 to rotate around the shaft 40. In the decoupled state of the clutch 205, the flywheel 207 rotationally couples the planet carrier 202 to the shaft 40. The flywheel 207 is allowed to coast in the disengaged state of the clutch 205 to prevent the hub shell 20 from driving the driver 10 when the user does not apply torque to the driver 10 .

[0141] Fig. 8A and Figure 8B A schematic example of a hub assembly 1000 is shown. The hub assembly 1000 comprises a hub shell 20 for mounting to a driven wheel of a bicycle. In this example, the hub shell 20 comprises spoke flanges 21 for mounting spokes of the wheel thereto. The hub shell 20 is rotatable about a second axis A2, which here corresponds to the axis of rotation of the bicycle wheel. The hub assembly 1000 here also comprises an axle 40 extending longitudinally along the second axis A2. The axle 40 can be mounted to a frame of a bicycle.

[0142] The hub assembly 1000 further comprises a drive 10 connected to a sprocket 3 or a plurality of sprockets, such as a sprocket box. The sprocket may be part of a sprocket box or a sprocket set, comprising up to ten different sprockets, in particular up to eight different sprockets, more particularly up to six different sprockets, more particularly up to four different sprockets. The drive 10 is rotatable about a first axis A1. The first axis A1 and the second axis A2 are parallel to each other. The first axis A1 and the second axis A2 may, for example, coincide.

[0143] The hub assembly 1000 also includes a transmission 30 operatively connected between the driver 10 and the hub shell 20. The user can drive the driver 10 (e.g., via the sprocket 3) to rotate about the first axis A1, wherein the transmission 30 transmits torque from the driver 10 to the hub shell 20, thereby driving the hub shell 20 and in turn driving the bicycle wheel to rotate about the second axis A2. The sprocket 3 can be engaged with a chain, belt, or universal joint, for example, to transmit torque from the crank and front chain ring of the bicycle to the driver 10.

[0144] The transmission 30 in this example can be selectively operated according to a plurality of different gear ratios. Thus, torque can be transmitted from the driver 10 to the hub shell 20, thereby driving the hub shell 20 to rotate according to a selected one of a plurality of gear ratios, thereby driving the bicycle wheel to rotate. The transmission 30 is preferably electrically driven. An actuator 30A can also be included in the hub shell 20. The actuator can communicate with the controller and / or the shifter by wire or wirelessly. The hub assembly may include an antenna, for example, arranged in the hub shell 20.

[0145] In this example, the wheel hub assembly also includes an electric propulsion motor 50. The electric propulsion motor 50 is configured to propel or assist in propulsing the bicycle. Here, the electric propulsion motor 50 is coupled or can be coupled to the hub shell 20 via the transmission 30. In this example, the transmission 30 includes a transmission input 30i and a transmission output 30o. Here, the drive 10 is connected to the transmission input 30i to drive the transmission 30. Optionally, the drive 10 can be connected to the transmission input 30i to drive the transmission 30 via a flywheel (e.g., flywheel 10F). Here, the electric propulsion motor 50 is connected to the transmission input 30i to drive the transmission. Optionally, the electric propulsion motor 50 can be connected to the transmission input 30i to drive the transmission 30 via a flywheel (e.g., flywheel 50F). The transmission output 30o is connected to the hub shell 20 for driving the hub shell according to one of a plurality of gear ratios. Here, the transmission 30 and the electric propulsion motor 50 are arranged in a hub cavity formed by the hub shell 20, such as a sealed hub cavity 19. A power line may be provided from outside the hub cavity 19 to the electric propulsion motor 50 to provide power. The electric propulsion motor 50 may have a stator rotationally coupled to the shaft 40, and a rotor rotatably arranged relative to the stator. The electric propulsion motor 50 in this example is concentric with the second axis A2.

[0146] exist Figure 8BIn the example of , the hub shell 20 includes an inner part 20i, which accommodates the transmission 30 and the electric propulsion motor 50 in this example, and an outer part 20o for mounting on the bicycle wheel. In this example, the outer part 20o of the hub shell 20 includes a spoke flange 21 for mounting the spokes of the wheel thereon. The outer part 20o is detachably mounted to the inner part 20i. For example, the outer part 20o is radially supported by one or more radial supports of the inner part 20i. The outer part 20o can be rotationally coupled relative to the inner part 20i, for example, by a spline connection. The outer part 20o can be axially fixed relative to the inner part 20i, for example, by an axial stop. The outer part 20o can be fixed to the inner part 20i, for example by a thread, for example by a (single) nut. Therefore, the inner part 20i with the transmission 30 and the electric propulsion motor 50 can be arranged as a subassembly that can be easily mounted in the outer part 20o. This can, for example, allow the outer part 20o to be easily exchanged with a different outer part to apply the transmission and the electric propulsion motor to different wheels. This may, for example, allow the inner portion 20i to be easily exchanged with a different inner portion to provide a wheel with a different transmission and electric propulsion motor. It should be understood that the inner portion 20i and the outer portion 20o may also be applied to the other wheel hub assembly examples shown herein.

[0147] exist Figure 8B In the example of the embodiment, the shaft 40 is a hollow wheel shaft. In this example, a through shaft 40T is provided, which extends through the hollow wheel shaft 40, so as to facilitate the hub assembly 100 to be mounted on the frame of the bicycle. It should be understood that the through shaft can also be applied to other examples of the hub assembly shown in this article.

[0148] Fig. 9A and Fig. 9B An example of a hub assembly 1000 is shown, which is similar to Fig. 8A , Figure 8B The example shown in , and similar to Fig. 7A , Figure 7B The example shown in , and also includes an electric propulsion motor 50. The electric propulsion motor 50 is configured to propel or assist in propulsing the bicycle. Here, the electric propulsion motor 50 is coupled or can be coupled to the input end of the planetary transmission, in particular to the second planetary gear set 200. Fig. 8A In the example of FIG. 5 , the electric propulsion motor 50 is directly coupled to the ring gear 204 , while Figure 8B In the example of FIG. 5 , the electric propulsion motor 50 is coupled to the ring gear 204 via the reduction gear 51. It can be understood that in Fig. 8A and Figure 8BIn the example of , a reduction in speed between the electric propulsion motor 50 and the hub shell 20 may also be applied. Here, the electric propulsion motor 50 is arranged in a sealed hub cavity 19 formed by the hub shell 20. A power line may be provided to the electric propulsion motor 50 from outside the sealed hub cavity 19 to provide power. The electric propulsion motor 50 may have a stator rotationally coupled to the shaft 40, and a rotor rotatably arranged relative to the stator.

[0149] Fig. 10A and Fig. 10B An example of a wheel hub assembly 1000 is shown, including Figure 1A , Figure 1B and Figure 2A , Figure 2B The CVT 403 shown, and including Fig. 6A , Figure 6B and Fig. 7A , Figure 7B The planetary transmission of the first planetary gear set 100 and the second planetary gear set 200 is shown. Fig. 10A , Fig. 10B The hub assembly 1000 shown is Figure 5A , Figure 5B and Figure 5C The example of is similar, but also includes a second planetary gear set 200 . Fig. 9A The second planetary gear set 200 of the example is Fig. 6A , Figure 6B The second planetary gear set 200 is shown similar. Fig. 10B The second planetary gear set 200 of the example is Fig. 7A , Figure 7B The second planetary gear set 200 is similar. The planetary transmission is arranged in the sealed hub cavity 19 formed by the hub shell 20, and the CVT 403 is arranged outside the sealed hub cavity 19. Fig. 9A and Fig. 9B The assembly 1000 shown in FIG. 1 comprises a single sprocket 3 . 1 , but it will be appreciated that a plurality of sprockets may also be used.

[0150] Fig.11A A drive assembly 1001 is shown comprising a first drive element 410 and a second drive element 420 as described herein. The first drive element 410 is connected to the sprocket 3, while the second drive element 420 is releasably connected to the hub shell 20. Here, the drive assembly 1001 comprises a first shaft portion 41 . Fig. 11B Shows Fig.11AThe driver assembly 1001 is connected to the hub shell 20 to form the hub assembly 1000 as described herein. Here, the hub shell 20 is associated with the second shaft portion 42. The first shaft portion 41 and the second shaft portion 42 can be releasably coupled to each other to form the shaft 40. Therefore, when the wheel and the hub shell 20 are removed, the driver assembly 1001 can remain coupled to the bicycle frame, thereby facilitating the replacement of the wheel.

[0151] Fig.12 Bicycle 10000 is shown. Bicycle 10000 includes a frame 10002 having a front fork 10005 and a rear fork 10007, and front and rear wheels 10011, 10013 located in the front fork and rear fork, respectively. Bicycle 10000 also includes cranks 10017 and a front sprocket 10019. Bicycle includes hub assembly 1000 as described herein. Bicycle 10000 also includes sprockets 3, wherein a chain 10023 passes through the front sprocket 10019 and the rear sprocket 10021. Bicycle here has no derailleur.

[0152] The concise and general description of certain aspects described above is now summarized into numbered embodiments.

[0153] Embodiment 1. A hub assembly for a bicycle wheel, comprising:

[0154] a driver rotatable about a first axis for mounting to the sprocket;

[0155] a hub shell rotatable about a second axis parallel to the first axis for mounting to a bicycle wheel;

[0156] A transmission is selectively operable according to a plurality of different gear ratios and is operatively connected between the driver and the hub shell.

[0157] Embodiment 2. The wheel hub assembly of embodiment 1, wherein the transmission comprises a continuously variable transmission selectively operable according to a plurality of gear ratios within a continuous gear ratio range.

[0158] Embodiment 3. The hub assembly of embodiment 2, wherein the continuously variable transmission is a ratchet type having a flywheel or a one-way drive element.

[0159] Embodiment 4. The wheel hub assembly of embodiment 2 or 3, wherein the continuously variable transmission is arranged to change the transmission ratio under load.

[0160] Embodiment 5. The wheel hub assembly of any one of embodiments 2-4, wherein the continuously variable transmission comprises

[0161] a first drive element connected to the driver and rotatable about a first axis;

[0162] a second drive element connected to the hub shell and rotatable about a second axis, the first drive element being movable relative to the second drive element in a direction transverse to the first axis and the second axis;

[0163] The coupling element is arranged at a constant first radius from the first axis and a variable second radius from the second axis, or at a constant first radius from the second axis and a variable second radius from the first axis, for transmitting torque between the first drive element and the second drive element.

[0164] Embodiment 6. The hub assembly of embodiment 5, wherein the first drive element is fixed to or integrated with the driver.

[0165] Embodiment 7. The hub assembly of embodiment 5 or 6, wherein the second drive element is coupled or coupleable to the hub shell.

[0166] Example 8. The hub assembly of any one of Examples 5-7, comprising a shaft having a first shaft portion and a second shaft portion, wherein the first drive element is arranged to rotate around the first shaft portion, and the hub shell is arranged to rotate around the second shaft portion, wherein the first shaft portion and the second shaft portion are detachably connected to each other.

[0167] Embodiment 9. The wheel hub assembly of embodiment 8, wherein the first shaft portion is arranged to be fixed to a frame of a bicycle, in particular to a lower fork of the bicycle frame, more specifically to a right lower fork of the bicycle frame.

[0168] Embodiment 10. The hub assembly of any one of embodiments 5-9, comprising a flywheel located between the second drive element and the hub shell.

[0169] Embodiment 11. The hub assembly according to any one of embodiments 5-10, wherein the coupling element is coupled to the second drive element in a tangential direction and is movable relative to the second drive element in a radial direction,

[0170] wherein the coupling element is coupled to the first drive element in a radial direction at a first radius from the first axis and is movable relative to the first drive element in a first tangential direction, and wherein the coupling element is coupled to the first drive element in a second tangential direction opposite to the first tangential direction.

[0171] Embodiment 12. The wheel hub assembly of any one of embodiments 5-11, wherein the first drive element is pivotally movable about a pivot axis extending parallel to the first axis for pivotally movable between a first extreme position and a second extreme position in a direction transverse to the first axis relative to the second drive element.

[0172] Embodiment 13. The wheel hub assembly of embodiment 12, wherein the first extreme position is a concentric position where the first axis coincides with the second axis, and wherein the second extreme position is an eccentric position where the first axis is offset from the second axis.

[0173] Embodiment 14. The hub assembly of embodiment 12 or 13, wherein the first drive element is pivotable about the pivot axis to a selective position within a continuous pivot range, for example defined between a first extreme position and a second extreme position, wherein the continuous pivot range is symmetrical relative to a horizontal plane passing through the pivot axis.

[0174] Embodiment 15. The hub assembly of any one of embodiments 12-14, wherein the pivot axis is arranged trailingly of the second axis relative to an intended driving direction of the bicycle.

[0175] Embodiment 16. A wheel hub assembly according to any one of embodiments 12-15, wherein the first drive element forms a central cavity for allowing the shaft to extend therethrough, wherein the pivot axis is arranged in a crossover space, which is defined as the intersection of the central cavity when the first drive element is in a first extreme position and the central cavity when the first drive element is in a second extreme position.

[0176] Embodiment 17. The wheel hub assembly of embodiment 16, wherein the wheel hub assembly includes an actuator for actuating movement of the first drive element relative to the second drive element in a direction transverse to the second axis, wherein the actuator is arranged in the intersection space.

[0177] Embodiment 18. The wheel hub assembly of any of Embodiments 1-17, comprising a sealed hub cavity formed by a hub shell.

[0178] Example 19. The hub assembly of Example 18, at least as defined by Example 2, wherein the continuously variable transmission is located outside of the sealed hub cavity.

[0179] Embodiment 20. The wheel hub assembly of any of Embodiments 1-19, wherein the transmission comprises a planetary transmission selectively operable according to a plurality of different gear ratios.

[0180] Embodiment 21. The hub assembly of embodiment 20, at least as defined by embodiment 2, wherein the planetary transmission is connected in series to the continuously variable transmission.

[0181] Example 22. The hub assembly of Example 20 or 21, at least dependent on Example 18, wherein the planetary transmission is arranged in a sealed hub cavity.

[0182] Embodiment 23. The wheel hub assembly of any of Embodiments 20-22, comprising an intermediate drive portion having an input end connected to the driver and an output end connected to the planetary transmission.

[0183] Embodiment 24. The wheel hub assembly of embodiment 23, wherein the intermediate drive portion extends between an intermediate drive portion output end inside the sealed wheel hub cavity and an intermediate drive portion input end outside the sealed wheel hub cavity.

[0184] Example 25. A hub assembly of any one of Examples 20-24, wherein the planetary transmission includes a first planetary gear set that is selectively operable according to a first gear ratio and a second gear ratio, and has a first clutch for switching from the first gear ratio to the second gear ratio and / or vice versa.

[0185] Example 26. The hub assembly of Example 25, wherein the first planetary gear set includes a sun gear, a ring gear, and a planet carrier carrying the planetary gears.

[0186] Embodiment 27. The hub assembly of embodiment 25 or 26, wherein the first gear ratio is a single gear ratio and the second gear ratio is a non-single gear ratio, or vice versa.

[0187] Example 28. A hub assembly of any one of Examples 20-27, wherein the planetary transmission includes a second planetary gear set that is selectively operable according to a third gear ratio and a fourth gear ratio, and has a second clutch for switching from the third gear ratio to the fourth gear ratio and / or vice versa.

[0188] Example 29. The hub assembly of Example 28, wherein the second planetary gear set is a ringless planetary gear set including a sun gear and a planet carrier carrying the planetary gears, or wherein the second planetary gear set is a sunless planetary gear set including a ring gear and a planet carrier carrying the planetary gears.

[0189] Embodiment 30. The hub assembly of embodiment 28 or 29, wherein the third gear ratio is a single gear ratio and the fourth gear ratio is a non-single gear ratio, or vice versa.

[0190] Embodiment 31. The hub assembly of any one of Embodiments 28-30, wherein the second planetary gear set includes a stepped planetary gear having a small radius portion and a large radius portion.

[0191] Embodiment 32. The hub assembly of any one of Embodiments 28-31, wherein the second planetary gear set is connected in series with the first planetary gear set.

[0192] Embodiment 33. The wheel hub assembly of embodiment 18 or any one of embodiments 19-32, at least dependent on embodiment 18, includes an electric propulsion motor connected to the hub shell, and the electric propulsion motor is arranged in the sealed hub cavity.

[0193] Example 34. The wheel hub assembly of Example 33, wherein the electric propulsion motor is connected to the hub shell via a transmission.

[0194] Example 35. The hub assembly of Example 33 includes a reduction gear located between the motor and the transmission input end.

[0195] Example 36. The hub assembly of any one of Examples 1-35, wherein the sprocket is part of a sprocket box or a sprocket set, the sprocket box or the sprocket set comprising up to ten different sprockets, in particular up to eight different sprockets, more in particular up to six different sprockets, more in particular up to four different sprockets.

[0196] Embodiment 37. The wheel hub assembly of any of embodiments 1-36, wherein the sprocket is movable in an axial direction relative to the driver, and wherein the wheel hub assembly comprises an actuator for actuating the sprocket in the axial direction.

[0197] Embodiment 38. The wheel hub assembly of any one of embodiments 1-37, comprising a battery and a wired connection between the battery and an actuator of a transmission, particularly a continuously variable transmission.

[0198] Embodiment 39. The wheel hub assembly of any of Embodiments 1-38, comprising an antenna for wirelessly communicating with external components (eg, a controller and / or a shifter), wherein the antenna is optionally disposed within a sealed wheel hub cavity.

[0199] Embodiment 40. The hub assembly of Embodiment 39, as dependent upon at least Embodiment 8 or 9, wherein the antenna is associated with (eg, coupled to) the first shaft portion.

[0200] Embodiment 41. The hub assembly of any of embodiments 1-40, comprising a generator for generating electricity, the generator being particularly operably disposed between the shaft or shaft portion and a component of the assembly rotatable relative to the shaft or shaft portion.

[0201] Embodiment 42. The hub assembly of embodiment 41, wherein the generator is arranged in a sealed hub cavity.

[0202] Example 43. The wheel hub assembly of any one of Examples 1-42, comprising a controller for controlling the transmission.

[0203] Example 44. The wheel hub assembly of Example 43, comprising a wired connection between the controller and the transmission.

[0204] Example 45. The hub assembly of Example 44 is at least subordinate to Example 2 and Example 20, wherein the controller is arranged to control the continuously variable transmission and the planetary transmission.

[0205] Example 46. The hub assembly of Example 45, wherein the controller is arranged to further control the derailleur.

[0206] Example 47. A wheel hub assembly according to any one of Examples 1-46, comprising a shaft extending longitudinally along a second axis between a drive side end proximate to the drive and a non-drive side end opposite to the drive side; and a torque support for supporting torque from the shaft to a bicycle frame, wherein the torque support is optionally arranged on the drive side.

[0207] Embodiment 48. The hub assembly of Embodiment 47, wherein the torque support is configured to engage a derailleur bracket of a bicycle frame.

[0208] Embodiment 49. The hub assembly of Embodiment 48, wherein the torque support is integrated with the derailleur bracket.

[0209] Embodiment 50. A drive assembly for a bicycle wheel, comprising:

[0210] a first drive element connected to the sprocket and rotatable about a first axis;

[0211] a second drive element connectable to the hub shell and rotatable about a second axis, the first drive element being movable relative to the second drive element in a direction transverse to the first axis and the second axis;

[0212] A coupling element disposed at a constant first radius from the first axis and a variable second radius from the second axis, or at a constant first radius from the second axis and a variable second radius from the first axis, is used to transmit torque between the first drive element and the second drive element.

[0213] Embodiment 51. The drive assembly of embodiment 50, wherein the coupling element is coupled to the second drive element in a tangential direction and is movable relative to the second drive element in a radial direction,

[0214] wherein the coupling element is coupled to the first drive element in a radial direction at a first radius from the first axis and is movable relative to the first drive element in a first tangential direction, and wherein the coupling element is coupled to the first drive element in a second tangential direction opposite to the first tangential direction.

[0215] Embodiment 52. A bicycle wheel comprising the hub assembly according to any one of embodiments 1-49 and / or the driver assembly of embodiments 50 or 51.

[0216] Embodiment 53. A bicycle comprising a wheel according to embodiment 52, and / or a hub assembly according to any one of embodiments 1-49 and / or a drive assembly according to embodiment 50 or 51.

[0217] Example 54. A transmission system for a bicycle, comprising a hub assembly according to any one of Examples 1-49 or a drive assembly according to Example 50 or 51, and further comprising a crank assembly, the crank assembly comprising a crank, a sprocket and a crank transmission arranged between the crank and the sprocket, which can be selectively operated according to multiple different gear ratios.

[0218] Example 55. The drive system of Example 54, wherein the crank assembly includes an electric propulsion motor.

[0219] The present invention is described herein with reference to specific examples of embodiments of the invention. However, it will be apparent that various modifications and changes may be made therein without departing from the essence of the invention. For the sake of clarity and concise description, features are described herein as being part of the same or separate embodiments, however, alternative embodiments having combinations of all or part of the features described in these separate embodiments are also contemplated.

[0220] However, other modifications, changes and alternatives are possible.Accordingly, the specification, drawings and examples are to be regarded as illustrative rather than restrictive.

[0221] For clarity and simplicity of description, features are described herein as being part of the same or separate embodiments, but it is to be understood that the scope of the present invention may include embodiments having a combination of all or part of the described features.

[0222] In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of other features or steps than those listed in a claim. Furthermore, the words "a" and "an" shall not be construed as being limited to "only one", but are used to mean "at least one", and do not exclude a plurality. Just because certain measures are recited in mutually different claims does not indicate that a combination of these measures cannot be used to advantage.

Claims

1. A hub assembly for a bicycle wheel, comprising: a driver rotatable about a first axis for mounting to the sprocket; a hub shell rotatable about a second axis parallel to the first axis for mounting to the bicycle wheel; a transmission selectively operable according to a plurality of different gear ratios and operatively connected between the driver and the hub shell; An electric propulsion motor is connected to the hub shell via the transmission.

2. The wheel hub assembly according to claim 1, wherein: The transmission comprises a transmission input and a transmission output, wherein the drive is connected to the transmission input to drive the transmission, wherein the electric propulsion motor is connected to the transmission input to drive the transmission, and wherein the transmission output is connected to the hub shell to drive the hub shell according to one of the plurality of gear ratios.

3. A wheel hub assembly according to claim 1 or 2, comprising a sealed hub cavity formed by the hub shell, the hub cavity accommodating the transmission and optionally the electric propulsion motor.

4. The wheel hub assembly according to any one of claims 1 to 3, wherein: The hub shell comprises an inner portion accommodating the transmission and optionally the electric propulsion motor, and an outer portion for mounting to the bicycle wheel, wherein the outer portion is detachably mounted to the inner portion.

5. A wheel hub assembly according to any one of claims 1 to 4, comprising a reduction gear between the electric propulsion motor and the transmission input.

6. A wheel hub assembly according to any one of claims 1 to 5, comprising a flywheel located between the driver and the transmission input.

7. A wheel hub assembly according to any one of claims 1 to 6, comprising a flywheel located between the electric propulsion motor and the transmission input.

8. The wheel hub assembly according to any one of claims 1 to 7, wherein: The electric propulsion motor has a stator rotationally coupled to the axle of the hub assembly, and a rotor rotatably arranged relative to the stator.

9. The wheel hub assembly according to any one of claims 1 to 8, wherein: The electric propulsion motor is concentric with the second axis.

10. A wheel hub assembly according to any one of claims 1 to 9, comprising a through shaft extending through a hollow axle of the wheel hub assembly.

11. The wheel hub assembly according to any one of claims 1 to 10, wherein: The transmission includes a planetary transmission selectively operable according to a plurality of different gear ratios.

12. The wheel hub assembly of claim 11, comprising an intermediate drive section having an input end connected to the driver and an output end connected to the planetary transmission, wherein: The intermediate drive section extends between an intermediate drive section output end inside the wheel hub cavity and an intermediate drive section input end outside the wheel hub cavity.

13. The wheel hub assembly according to any one of claims 11 to 12, wherein: The planetary transmission includes a first planetary gear set selectively operable according to a first gear ratio and a second gear ratio, and has a first clutch for switching from the first gear ratio to the second gear ratio and / or vice versa.

14. The wheel hub assembly according to any one of claims 1 to 13, wherein: The sprocket is part of a sprocket cassette or a sprocket set comprising at most ten different sprockets, in particular at most eight different sprockets, more particularly at most six different sprockets, more particularly at most four different sprockets.

15. A wheel hub assembly according to any one of claims 1 to 14, comprising an antenna for wireless communication with external components, such as a controller and / or a shifter, wherein: The antenna is optionally disposed within a sealed hub cavity.

16. A wheel hub assembly according to any one of claims 1 to 15, comprising a controller for controlling the transmission, wherein: The controller is optionally also arranged to further control the derailleur.

17. A hub assembly according to any one of claims 1 to 16, comprising a shaft extending longitudinally along the second axis between a drive side end proximate the driver and a non-drive side end opposite the drive side; and a torque support for supporting torque from the shaft to a frame of the bicycle, wherein The torque support may optionally be arranged on the drive side.

18. A wheel for a bicycle, comprising a hub assembly according to any one of claims 1 to 17.

19. Bicycle comprising a wheel according to claim 18 and / or a hub assembly according to any one of claims 1 to 17.

20. A transmission system for a bicycle, comprising a hub assembly according to any one of claims 1 to 19, and further comprising a crank assembly, the crank assembly comprising a crank, a chain ring and a crank transmission arranged between the crank and the chain ring, the crank transmission being selectively operable according to a plurality of different gear ratios.

Images