Bicycle derailleur system

Abstract

A bicycle transmission system includes a three-speed planetary transmission having a planetary gear set having three rotating members including a sun gear, a planet carrier carrying one or more planet gears, and a ring gear. A three-speed planetary transmission includes a first actuatable clutch module and a second actuatable clutch module for selectively switching between any of three different gear ratios.

Description

Technical Field

[0001] The present invention relates to a bicycle transmission system. Background Art

[0002] Conventional bicycle transmission systems may include derailleurs for switching the chain between sprockets of different sizes to selectively provide different gear ratios from the input crank to the driven wheel. An alternative to a derailleur is formed by a hub transmission, where gear shifting is achieved by a shifting mechanism inside the hub of the driven wheel. Typically, one or more planetary gear sets provide multiple selectable gear ratios for the hub transmission. For example, a hub transmission with a three-speed planetary gear set is well known. Summary of the Invention

[0003] The present invention aims to provide an improved bicycle transmission, particularly a hub transmission or a crank transmission. In a broader sense, the object of the present invention is to overcome or improve at least one of the disadvantages of the prior art, or at least provide an alternative process and structure that is more effective than the prior art. In any case, it is at least intended to provide a useful alternative and contribution to the prior art.

[0004] According to one aspect, a bicycle transmission is provided. The bicycle transmission includes a planetary transmission having three rotating members. The planetary transmission includes a first clutch module and / or a second clutch module. The first clutch module includes a first actuatable clutch in the transmission path between the planetary transmission input and the first rotating member, and a first flywheel in the transmission path between the planetary transmission input and the second rotating member. The second clutch module includes a second actuatable clutch in the transmission path between the second rotating member and the planetary transmission output, and a second flywheel in the transmission path between the first rotating member and the planetary transmission output. The third rotating member is non-rotatably fixed to a fixed bridge shaft.

[0005] Thus, a speed-increasing two-speed planetary transmission, a speed-decreasing two-speed planetary transmission, and a three-speed planetary transmission can be selectively obtained. For example, a speed-increasing two-speed planetary transmission can be obtained by including only the first clutch module. For example, a speed-decreasing two-speed planetary transmission can be obtained by including only the second clutch module. For example, a three-speed planetary transmission can be obtained by including both the first clutch module and the second clutch module.

[0006] The first clutch module can be configured to selectively be in a first state or a second state. In the first state, the first actuable clutch is closed so that torque can be transmitted from the planetary transmission input to the first rotating member through the first actuable clutch, and the first flywheel overruns; in the second state, the first actuable clutch is open so that no torque can be transmitted through the first actuable clutch, and the first flywheel transmits torque from the planetary transmission input to the second rotating member.

[0007] The second clutch module can be configured to selectively be in a third state or a fourth state. In the third state, the second actuable clutch is closed so that torque can be transmitted from the second rotating member to the planetary transmission output, and the second flywheel overruns; and in the fourth state, the second actuable clutch is open so that no torque can be transmitted through the second actuable clutch, and the second flywheel transmits torque from the first rotating member to the planetary transmission output.

[0008] With the first clutch module or the second clutch module, the transmission system can selectively operate according to two different transmission ratios. With the first clutch module and the second clutch module, the transmission system can selectively operate according to three different transmission ratios. The first clutch module and the second clutch module can be switched between their respective states, for example, by actuating the first actuable clutch and the second actuable clutch electrically respectively. The first actuable clutch and the second actuable clutch can be particularly independently actuable.

[0009] Optionally, the transmission system can include a first electric actuator arranged to actuate the first actuable clutch and a second electric actuator arranged to actuate the second actuable clutch.

[0010] The first flywheel and the second flywheel can be non-actuable passive mechanisms. The flywheel overruns when the output of the flywheel rotates faster than its input. For example, each flywheel is configured to disengage its driving input from its driven output when its driven output rotates faster than its driving input. The first flywheel overruns in the first state, thus allowing the first rotating member and the second rotating member to rotate at different speeds. The second flywheel overruns in the third state.

[0011] The first actuable clutch is arranged to selectively couple or decouple the planetary transmission input to the first rotating member having a rotational speed lower than the second rotating member. Thus, in the first state, when the first rotating member is driven via the first actuable clutch, the first flywheel overruns, while in the second state, when the second rotating member is driven via the flywheel, the first rotating member is decoupled from the planetary transmission input by the first actuable clutch.

[0012] A planetary transmission can have at most three rotating planetary gear set members. One of the rotating members is fixed to a stationary part, such as a stationary bridge shaft or a housing part. A first clutch module selectively couples the planetary transmission input to one of the non-stationary rotating members. A second clutch module selectively couples the planetary transmission output to one of the non-stationary rotating members.

[0013] The planetary gear set members, which are at most three in number, can include a sun gear, a planet carrier carrying one or more planet gears, and a ring gear. The planetary gear set members, which are at most three in number, can include a sun gear of a single diameter, a planet carrier carrying one or more planet gears, and a ring gear of a single diameter. The planetary gear set members, which are at most three in number, can include only one sun gear, only one planet carrier carrying one or more planet gears, and only one ring gear. Alternatively, the planetary gear set members, which are at most three in number, can include two sun gears and a planet carrier carrying one or more planet gears. Alternatively, the planetary gear set members, which are at most three in number, can include two ring gears and a planet carrier carrying one or more planet gears. The planetary transmission can selectively operate according to at least two, e.g., two or three, different transmission ratios between the planetary transmission input and the planetary transmission output. The first clutch module is connected or connectable to the planetary transmission input and is configured to selectively transfer torque from the planetary transmission input to the first or the second of the three rotating members. The second clutch module is connected or connectable to the planetary transmission output and is configured to selectively transfer torque from the first or the second of the three rotating members to the three-speed planetary transmission output.

[0014] A bicycle transmission system can use one clutch module, e.g., only the first clutch module or only the second clutch module, to switch between two different transmission ratios.

[0015] A bicycle transmission system can use two actuatable clutches, e.g., the first clutch module and the second clutch module, to switch between three different transmission ratios.

[0016] A transmission system including the first clutch module and the second clutch module particularly allows for a direct change from one system transmission ratio to any other system transmission ratio in one step, i.e., without passing through an intermediate system transmission ratio. For example, by correspondingly using the first actuatable clutch and the second actuatable clutch, the planetary transmission can be operable according to a first transmission ratio, a second transmission ratio, and a third transmission ratio. The planetary transmission can directly switch between any of the three transmission ratios, e.g., directly from the first transmission ratio to the second transmission ratio and vice versa, directly from the first transmission ratio to the third transmission ratio and vice versa, and directly from the second transmission ratio to the third transmission ratio and vice versa.

[0017] For example, the transmission system can be housed in the hub shell of the bicycle driven wheel and separated from the external environment by the hub shell. For example, when combined with a chainwheel case and a related derailleur for switching the chain between the chainwheels of the chainwheel case, a large transmission ratio range and a convenient transmission ratio step between successive transmission ratios can be obtained.

[0018] The first actuable clutch and the second actuable clutch can each be electrically controlled and actuated independently, for example, independently actuated between the corresponding engaged state and disengaged state. Thus, each clutch module can selectively be in one of only two states. Combined, the first clutch module and the second clutch module can selectively be in one of four states, for example, associated with: the first clutch closed and the second clutch closed; the first clutch open and the second clutch closed; the first clutch closed and the second clutch open; the first clutch open and the second clutch open.

[0019] Optionally, the first rotating member is a planet carrier carrying one or more planet gears. Optionally, the second rotating member is a ring gear. Optionally, the third rotating member is a sun gear. The first rotating member can be a planet carrier, the second rotating member can be a ring gear of a single diameter, and the third rotating member can be a sun gear of a single diameter. Thus, the first clutch module can be connected or connectable to the three-speed planetary transmission input and is configured to selectively transfer torque from the three-speed planetary transmission input to the planet carrier or the ring gear.

[0020] Optionally, one or more planet gears of the planetary transmission are stepped planet gears, the stepped planet gears including a large-radius gear portion and a small-radius gear portion that are rotationally fixed to each other. This allows a relatively large transmission ratio to be obtained with a relatively compact arrangement.

[0021] Optionally, the stepped planet gear includes, for example, two small-radius gear portions that are the same and are rotationally fixed to the large-radius gear portion on opposite sides of the large-radius gear portion. Thus, a symmetric planet gear can be obtained, which can provide effective support for the stepped planet gear. The large-radius gear portion can, for example, engage with the ring gear such that torque can be transferred from the planet carrier to the ring gear via the large-radius planet gear portion, where, for example, the two small-radius planet gear portions on opposite sides of the large-radius planet gear portion engage with corresponding sun gear portions of a single-diameter sun gear. Thus, a robust and compact arrangement can be obtained.

[0022] Optionally, the first actuatable clutch is actuatable between a coupled state associated with a first state and a decoupled state associated with a second state, and is configured to rotationally couple a three-speed planetary transmission input to a first rotating member in the coupled state and rotationally decouple the three-speed planetary transmission input from the first rotating member in the decoupled state. Thus, with the two states of the first actuatable clutch module, the three-speed planetary transmission input can be coupled to one of the rotating members of the planetary gear set of the three-speed planetary transmission. The first actuatable clutch module can be connected in series with, for example, one of the rotating members. The first actuatable clutch module can be connected in series with, for example, a planet carrier of a single diameter.

[0023] Optionally, the first clutch module includes a third flywheel in the transmission path between the planetary transmission input and the first actuatable clutch or in the transmission path between the first actuatable clutch and the first rotating member.

[0024] Optionally, the planetary transmission can operate selectively according to a unitary transmission ratio. Optionally, if the planetary transmission includes a first clutch module and a second clutch module, the planetary transmission operates according to the unitary transmission ratio when the first actuatable clutch is closed and the second actuatable clutch is open and / or when the first actuatable clutch is open and the second actuatable clutch is closed. Optionally, if the planetary transmission includes a first clutch module but not a second clutch module, the planetary transmission operates according to the unitary transmission ratio when the first actuatable clutch is closed, and the planetary transmission operates according to a non-unitary transmission ratio when the first actuatable clutch is open and vice versa. Optionally, if the planetary transmission includes a second clutch module but not a first clutch module, the planetary transmission operates according to the unitary transmission ratio when the second actuatable clutch is open, and the planetary transmission operates according to a non-unitary transmission ratio when the second actuatable clutch is closed and vice versa.

[0025] Optionally, the planetary transmission can operate selectively according to a stepped-up transmission ratio. Optionally, if the planetary transmission includes a first clutch module and a second clutch module, the planetary transmission operates according to the stepped-up transmission ratio when the first actuatable clutch is closed and the second actuatable clutch is closed. Optionally, if the planetary transmission includes a first clutch module but not a second clutch module, the planetary transmission operates according to the stepped-up transmission ratio when the first actuatable clutch is open.

[0026] Optionally, the planetary transmission can operate selectively according to a reduction gear ratio. Optionally, the increase gear ratio and the reduction gear ratio are reciprocals of each other. Optionally, if the planetary transmission includes a first clutch module and a second clutch module, when the first actuatable clutch is open and the second actuatable clutch is open, the planetary transmission operates according to the reduction gear ratio. Optionally, if the planetary transmission includes a second clutch module but does not include a first clutch module, when the first actuatable clutch is open, the planetary transmission operates according to the increase gear ratio.

[0027] Optionally, the second clutch module can be actuated between a coupled state associated with a third state and a decoupled state associated with a fourth state, and in the coupled state is configured to rotationally couple the planetary transmission output to a second rotating member, and in the decoupled state rotationally decouples the planetary transmission output from the second rotating member. Thus, with the two states of the second actuatable clutch, the planetary transmission output can be coupled to one of the rotating members of the planetary transmission. The second actuatable clutch can be connected in series with the second rotating member, for example. The second actuatable clutch can be connected in series with a ring gear of a single diameter, for example.

[0028] Optionally, the planetary transmission includes a fourth flywheel in the transmission path between the second rotating member and the second actuatable clutch or in the transmission path between the second actuatable clutch and the planetary transmission output. The third flywheel and / or the fourth flywheel allows the bicycle to roll backward and prevents the three-speed planetary transmission from locking up.

[0029] Optionally, the first actuatable clutch and the second actuatable clutch are the same. Thus, a manufacturing cost advantage can be obtained because the transmission system may only require one type of actuatable clutch, which can be mass-produced.

[0030] Optionally, the planetary transmission can operate selectively according to a unit gear ratio, an increase gear ratio, and a reduction gear ratio. The increase gear ratio and the reduction gear ratio can particularly be reciprocals of each other.

[0031] Optionally, the transmission system includes a hub shell for the driven wheel of the bicycle, such as an external hub shell, which at least partially defines a hub chamber, wherein the planetary transmission is received by the hub shell in the hub chamber.

[0032] Optionally, the transmission system further includes an internal hub shell, which is configured to be received in the hub chamber and removably coupled to, for example, the external hub shell for transferring torque from the internal hub shell to the external hub shell, for example. The planetary transmission can be housed within the internal hub shell and coupled to the internal hub shell for removal from the external hub shell, for example, together with the internal hub shell.

[0033] Optionally, the transmission system includes an additional planetary transmission having three additional rotating members. The additional planetary transmission may also include a third clutch module and / or a fourth clutch module. The third clutch module may include a third actuatable clutch in the transmission path between the additional planetary transmission input and the additional first rotating member, and a fifth flywheel in the transmission path between the additional planetary transmission input and the additional second rotating member. The fourth clutch module may include a fourth actuatable clutch in the transmission path between the additional second rotating member and the additional planetary transmission output, and a sixth flywheel in the transmission path between the additional first rotating member and the additional planetary transmission output. The additional third rotating member may be non-rotatably fixed to the fixed bridge shaft.

[0034] Thus, with the additional planetary transmission, it is also possible to selectively obtain a speed-increasing two-speed planetary transmission, a speed-decreasing two-speed planetary transmission, and a three-speed planetary transmission. Combining the additional planetary transmission with the planetary transmission can increase the number of transmission ratios of the transmission system. The combination of the planetary transmission and the additional planetary transmission can provide, for example, a four-speed transmission system, a six-speed transmission system, and / or a nine-speed transmission system.

[0035] The transmission ratios achievable with a transmission system comprising a planetary transmission and an additional planetary transmission can be selected using the first clutch module and / or the second clutch module, and the third clutch module and / or the fourth clutch module. Each actuatable clutch of the transmission system can be actuated independently, for example using a separate electric actuator.

[0036] The third clutch module can be configured to selectively be in a fifth state or a sixth state, wherein, in the fifth state, the third actuatable clutch is closed so that torque can be transmitted from the planetary transmission input through the third actuatable clutch to the additional first rotating member, and the fifth flywheel is overspeed; in the sixth state, the third actuatable clutch is open so that no torque can be transmitted through the third actuatable clutch, and the fifth freewheel transmits torque from the additional planetary transmission input to the additional second rotating member.

[0037] The fourth clutch module can be configured to selectively be in a seventh state or an eighth state, wherein, in the seventh state, the fourth actuatable clutch is closed so that torque can be transmitted from the additional second rotating member to the additional planetary transmission output, and the sixth flywheel is overspeed; and wherein, in the eighth state, the fourth actuatable clutch is open so that no torque can be transmitted through the fourth actuatable clutch, and the sixth flywheel transmits torque from the additional first rotating member to the additional planetary transmission output.

[0038] Optionally, an additional planetary transmission is connected in series to the planetary transmission.

[0039] Optionally, the planetary transmission input is connected or connectable to the output of an additional planetary transmission. Optionally, the planetary transmission output is connected or connectable to the input of an additional planetary transmission.

[0040] Optionally, the planetary transmission is a two-speed planetary transmission and the additional planetary transmission is a three-speed planetary transmission, providing a six-speed planetary transmission system. Optionally, the planetary transmission is a two-speed planetary transmission and the additional planetary transmission is a two-speed planetary gear transmission, providing a four-speed planetary transmission system. Optionally, the planetary transmission is a three-speed planetary transmission and the additional planetary transmission is a two-speed planetary transmission, providing a six-speed planetary transmission system. Optionally, the planetary transmission is a three-speed planetary transmission and the additional planetary transmission is a three-speed planetary gear transmission, providing a nine-speed planetary transmission system.

[0041] Optionally, if the planetary transmission is a three-speed planetary transmission and the additional planetary transmission is a two-speed planetary gearbox, the three-speed planetary transmission input can be connected or connectable to the two-speed planetary transmission output. It may be desirable to have a two-speed planetary transmission at the input side of the three-speed transmission, for example to reduce the torque on the three-speed planetary transmission.

[0042] Optionally, the additional planetary transmission includes at most three additional rotating planetary gear set members. The additional planetary transmission may include an additional sun gear, an additional planet carrier carrying one or more additional planet gears, and an additional ring gear. The at most three additional planetary gear set members may include an additional sun gear of a single diameter, an additional planet carrier carrying one or more planet gears, and an additional ring gear of a single diameter. The at most three additional planetary gear set members may include only one additional sun gear, only one planet carrier carrying one or more planet gears, and only one additional ring gear. Optionally, at least one of the additional sun gear, the additional planet carrier, and the additional ring gear is rotatably fixed or fixable to a fixed part.

[0043] Optionally, the additional sun gear of the additional planetary transmission is rotatably fixed or fixable to a fixed part.

[0044] Optionally, the additional planetary gear set of the additional planetary transmission is a sunless planetary gear set having only one planet carrier carrying one or more planet gears, and two ring gears. Optionally, only one planet carrier is rotatably fixed to a fixed part.

[0045] Optionally, the additional planetary gear set of the additional planetary transmission is an acyclic planetary gear set, having only one planet carrier carrying one or more planet gears and two sun gears. Optionally, only one planet carrier is rotatably fixed to the fixed part.

[0046] Optionally, the additional sun gear, one or more additional planet gears, and the additional ring gear of the three-speed planetary transmission are respectively the same in diameter as the sun gear, planet gears, and ring gear of the two-speed planetary transmission. The rotating members of the additional planetary transmission and the planetary transmission can be the same, for example, providing manufacturing cost benefits.

[0047] Optionally, at least one of the rotating members of the additional planetary transmission is different in diameter from the corresponding rotating member in the planetary transmission.

[0048] Optionally, the third actuatable clutch module is actuatable between a coupled state associated with a third state and a decoupled state associated with a fourth state, and is configured in the coupled state to rotatably couple the two-speed planetary transmission input to the planet carrier of the additional planetary transmission, and in the decoupled state to rotatably decouple the additional planetary transmission input from the planet carrier of the two-speed planetary transmission.

[0049] Optionally, the third clutch module includes a seventh flywheel in the transmission path between the additional planetary transmission input and the third actuatable clutch or between the third actuatable clutch and the additional first rotating member.

[0050] Optionally, the fourth clutch module includes an eighth flywheel in the transmission path between the additional planetary transmission input and the fourth actuatable clutch or between the fourth actuatable clutch and the additional second rotating member.

[0051] Optionally, the third actuatable clutch is the same as the fourth actuatable clutch.

[0052] Optionally, the third actuatable clutch and the fourth actuatable clutch are the same as the first actuatable clutch and the second actuatable clutch.

[0053] Optionally, the additional planetary transmission can be selectively operated according to a unit transmission ratio. Optionally, the additional planetary transmission can be selectively operated according to a stepped-up transmission ratio. The stepped-up transmission ratio can increase the additional planetary transmission output speed by at least 1.5 times, preferably at least 2 times, for example, in the range of about 2 to 3 times, relative to the additional planetary transmission input speed. Thus, the transmission system can obtain a larger transmission ratio range, where the two-speed planetary transmission makes a substantial contribution to this range, and the three-speed planetary transmission makes a substantial contribution to the intermediate transmission ratio steps within this range.

[0054] Optionally, the speed increasing transmission ratio of the additional planetary transmission is approximately equal to the cube of the speed increasing transmission ratio of the planetary transmission, or alternatively, the speed increasing and variable transmission ratio of the additional planetary transmission is approximately equal to the cube root of the speed increasing transmission ratio of the planetary transmission. For example, a nine-speed planetary transmission can be obtained, having substantially equal step amplitudes between the nine consecutive transmission ratios. For example, the planetary transmission can provide three transmission ratios: R1, R2, and R3, where R3 is equal to the reciprocal of R1, and where R2 is equal to 1. For example, the additional planetary transmission can provide three transmission ratios: R4, R5, and R6, where R4 is equal to the cube of R1, R5 is equal to 1, and R6 is equal to the reciprocal of R4. R1 can in particular be chosen to correspond to the desired step amplitude size between consecutive transmission ratios.

[0055] Optionally, the bicycle transmission system includes a hub shell for the bicycle driven wheel, wherein the additional planetary transmission is received by the hub shell. Thus, a hub transmission can be obtained, wherein the additional planetary transmission can be shielded from the outside environment by the hub shell. The planetary transmission and the additional planetary transmission can be received by a common hub shell. For example, the planetary transmission can be received by a first chamber, while the additional planetary transmission can be received by a second chamber, the first chamber and the second chamber being at least partially defined by the hub shell. The first chamber and the second chamber can for example be part of a single hub chamber formed by the hub shell.

[0056] Optionally, the transmission system includes a continuously variable transmission (CVT) connected in series with the planetary transmission and / or the additional planetary transmission, the CVT being selectively operable according to a plurality of different transmission ratios within a continuous CVT range. The CVT can be similar to the CVT disclosed in co-pending patent application PCT / EP1022 / 060920, the entire content of which is incorporated herein by reference.

[0057] Optionally, the CVT is controlled to selectively operate according to transmission ratios within a finite set of predetermined transmission ratios. The finite set of predetermined transmission ratios is a subset of the theoretically infinite set of transmission ratios defined by the continuous transmission ratio range obtainable by the CVT. The CVT can be controlled to switch between transmission ratios within the predetermined finite set of transmission ratios, for example between a predetermined first CVT transmission ratio and a predetermined second CVT transmission ratio, etc. The finite set of transmission ratios can for example include at most eleven different transmission ratios, such as at most five different transmission ratios. Thus, the CVT can be used as a discrete transmission, i.e., having discrete transmission ratios.

[0058] Optionally, the finite set of transmission ratios can be (pre)-programmed by the user. Thus, the discrete transmission ratio step amplitudes of the CVT can be (pre)-programmably adapted.

[0059] Optionally, the CVT is releasably coupled to the planetary transmission and / or an additional planetary transmission. Optionally, the output of the CVT is connected or connectable to the input of the planetary transmission and / or an additional planetary transmission.

[0060] Optionally, the transmission system includes an offset drive and a drive. The offset drive has a set of sprockets and an endless drive member, such as a chain or belt, configured to engage a sprocket of the set of sprockets. The drive is configured to be rotationally connected to the set of sprockets, wherein the offset drive is connected in series with the planetary transmission.

[0061] Optionally, the drive is rotationally integrated with the CVT, such as integrated with the CVT input.

[0062] Optionally, a continuously variable transmission includes: a first drive element rotatable about a first axis; a second drive element 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; a coupling element disposed at a first radius constant from the first axis and a second radius variable from the second axis, or disposed at a first radius constant from the second axis and a second radius variable from the first axis, for transmitting torque between the first drive element and the second drive element. The coupling element is arranged 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, the variable second radius at which torque is transmitted between the first drive element and the second drive element is changed. Thus, various transmission ratios can be obtained between the first drive element and the second drive element. Thus, various transmission ratios can be obtained between the input and the output of the CVT. The CVT can be manufactured with a relatively small form factor, having a relatively small number of components and a small mass.

[0063] The first drive element can be connected to a drive configured to receive a set of sprockets. The second drive element can be connected to a three-speed planetary transmission, a two-speed planetary transmission, and / or a hub shell.

[0064] Optionally, the coupling element is tangentially coupled to the second drive element and can move relative to the second drive element in the 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 radially coupled to the first drive element at a first radius from the first axis and can move 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, move freely relative to the first drive member in the first tangential direction and be coupled to the first drive element in the 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 move freely relative to the coupling element in the second tangential direction. In addition, the coupling element can drive the first drive element to rotate in the second tangential direction, and the coupling element can move freely relative to the first drive element in the first tangential direction.

[0065] Optionally, the first drive element can pivotally move about a pivot axis extending parallel to the first axis to pivotally move relative to the second drive element in a direction transverse to the first axis.

[0066] Optionally, the first drive element includes a first concentric guide extending concentrically about the first axis, wherein the first concentric guide is arranged to guide the movement of the coupling element in the first tangential direction. The first concentric guide can, for example, be a groove provided in the first drive element that extends concentrically about the first axis.

[0067] Optionally, the first concentric guide and the coupling element form or include a one-way coupling for allowing the coupling element to move relative to the first concentric guide in the first tangential direction and for preventing the coupling element from moving relative to the first concentric guide in the second tangential direction. Each of the coupling elements can, for example, include a one-way unit arranged to wedge between the inner and outer tracks of the first concentric guide when driven in the second tangential direction.

[0068] Optionally, each of the coupling elements includes a wedging body that can tilt about an inclined axis between a neutral position (neutral position) and a wedging position, in the neutral position allowing the coupling element to move freely relative to the first concentric guide, and in the wedging position the wedging body engaging the first concentric guide in a wedging manner. For example, the wedging body can wedge between the two tracks of the first concentric guide, for example, between the inner and outer tracks. It will be understood that the neutral position and the wedging position can only be slightly different, for example, a few micrometers at the extreme points. To present the neutral position, it is sufficient that the wedging body no longer engages the first concentric member in a wedging manner.

[0069] Optionally, each of the coupling elements includes at least one roller for activating the tilting of the wedging body from the neutral position to the wedging position.

[0070] Optionally, the first end of the wedging body is provided with a converging wedging recess for cooperating with the first roller, and the second end of the wedging body opposite the first end is provided with a diverging wedging recess for cooperating with the second roller. Here, convergence and divergence are defined as viewed from a direction away from the center of the wedging body. Relative to the flywheel direction of the wedging body, the converging wedging recess may be provided at the front end of the wedging body, while the diverging recess may be provided at the rear end of the wedging body. The first roller may be arranged, for example, between the inner track of the first concentric guide and the converging wedging surface of the converging wedging recess. The second roller may be arranged, for example, between the outer track of the first concentric guide and the diverging wedging surface of the diverging wedging recess. Optionally, the first roller and / or the second roller is biased, for example, elastically in the wedging direction, for example, towards the converging side of the wedging recess. The advantage provided is that the wedging body is biased in the wedging state and can be released by movement in the flywheel direction.

[0071] Optionally, the second drive element includes a first radial guide that extends at least radially relative to the second axis, i.e., has a radial component. The first radial guide is arranged to guide the movement of the coupling element in the radial direction and for transmitting torque in the tangential direction. The first radial guide may include a radially extending groove in the body of the second drive element.

[0072] Optionally, each of the coupling elements includes a guide wheel for traveling along the first radial guide.

[0073] Optionally, the coupling element is movably, such as hingedly, connected to the second drive element to allow radial movement of the coupling element relative to the second drive element.

[0074] Optionally, each wedging body can tilt between a neutral position and a wedging position about a tilting axis, in the neutral position allowing free movement of the coupling element relative to the first concentric guide, and in the wedging position each wedging body engaging the first concentric guide in a wedging manner.

[0075] Optionally, each of the coupling elements includes two wedging bodies. Optionally, each wedging body of the first coupling element can tilt between a neutral position and a wedging position about a common tilting axis, in the neutral position allowing free movement of the coupling element relative to the first concentric guide, and in the wedging position each wedging body engaging the first concentric guide in a wedging manner.

[0076] Optionally, the guide wheel can rotate about a common tilting axis, with the two wedging bodies arranged on both sides of the guide wheel.

[0077] Optionally, the transmission is arranged to pivot a first drive element about a pivot axis between a first extreme position and a second extreme position, e.g., 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.

[0078] Optionally, the first drive element is pivotable about the pivot axis to a selected position that defines a continuous pivot range between the first extreme position and the second extreme position, e.g., between the concentric position and the eccentric position, wherein the continuous pivot range is symmetric with respect to a horizontal plane passing through the pivot axis.

[0079] Optionally, the transmission system includes, e.g., a fixed axle shaft having a first axle shaft portion and a second axle shaft portion, wherein a CVT is associated with the first axle shaft portion and a three-speed planetary transmission is associated with the second axle shaft portion, and wherein the first axle shaft portion and the second axle shaft portion are removably connected to each other.

[0080] Optionally, any actuatable clutch described herein is arranged to couple and / or decouple under load. For example, each actuatable clutch described herein is arranged to couple and / or decouple under load. For example, any clutch described herein can be a form-closed clutch.

[0081] Optionally, the first actuatable clutch and the second actuatable clutch are form-closed clutches configured to transmit torque in both rotational directions.

[0082] For any one or each actuatable clutch, optionally, it can accommodate an actuatable clutch having a clutch input portion and a clutch output portion, the actuatable clutch including:

[0083] A first unit that can be connected to the clutch input portion, the first unit including at least one first abutting surface;

[0084] A second unit that can be connected to the clutch output portion, which includes at least one second abutting surface arranged to selectively engage the first abutting surface, the first abutting surface and the second abutting surface being adapted to each other to allow disengagement under load, preferably in both directions;

[0085] The third unit, which includes at least one retaining member, is arranged to be selectively in a first mode or a second mode relative to the second unit. In the first mode, at least one retaining member locks at least one second abutting surface to rotatably couple the second unit to the first unit, for example, in two directions, and in the second mode, releases at least one second abutting surface to decouple the second unit from the first unit. A transmission including such an actuatable clutch module can be manufactured in a small form factor suitable for integration in a two-wheeled bicycle.

[0086] Optionally, the actuatable clutch includes an actuator for moving the third unit relative to the second rotatable unit from a first position to a second position or from the second position to the first position.

[0087] Optionally, the third unit includes at least one actuating member arranged to move the third unit relative to the second rotatable unit from a first position to a second position or from the second position to the first position.

[0088] Optionally, the actuatable clutch further includes a fourth unit that includes a selector arranged to be selectively in a gripping mode or a non-gripping mode;

[0089] The selector in the gripping mode is arranged to grip at least one actuating member to rotate the third rotatable unit relative to the second rotatable unit from a first position to a second position or from the second position to the first position;

[0090] The selector in the non-gripping mode is arranged not to engage at least one actuating member. Optionally, the actuatable clutch module includes a first rotatable unit connectable to an input; a second rotatable unit connectable to an output; a third rotatable unit arranged to co-rotate with the second rotatable unit, the third rotatable unit being arranged to be selectively in a first rotational position or a second rotational position relative to the second rotatable unit, wherein the module is arranged to selectively rotatably couple the second rotatable unit to the first rotatable unit in the first rotational position and decouple the second rotatable unit from the first rotatable unit in the second rotational position; wherein the module is arranged to temporarily change the rotational speed of the third rotatable unit relative to the second rotatable unit to rotate from the first position to the second position or from the second position to the first position.

[0091] Optionally, the actuatable clutch module further includes a fourth unit including a selector arranged to selectively be in a gripping mode or a non-gripping mode; the selector in the gripping mode is arranged to grip at least one actuating member to rotate the third rotatable unit relative to the second rotatable unit from a first position to a second position or from the second position to the first position; the selector in the non-gripping mode is arranged to not engage at least one actuating member.

[0092] Any actuatable clutch module may be or, for example, be similar or identical to the clutches described in WO1018 / 199757A2, WO1020 / 085911A2 or WO1021 / 080431A1, the entire contents of which are incorporated herein by reference. For example, each actuatable clutch module may be or, for example, be similar or identical to the clutches described in WO1018 / 199757A2, WO1020 / 085911A2 or WO1021 / 080431A1.

[0093] According to one aspect, a modular bicycle transmission system is provided. The modular bicycle transmission includes a housing that defines a first chamber and a second chamber. The first chamber selectively houses a replaceable first transmission module or a replaceable first bridging element. The second chamber selectively houses a replaceable second transmission module or a replaceable second bridging element. Thus, by selecting appropriate replaceable transmission modules and / or replaceable bridging elements, various different settings can be obtained. When the first chamber or the second chamber does not house a transmission module, the chamber can house or not house a bridging element, but rather bridge the space of the chamber. The replaceable bridging element can transmit torque across the chamber in which the replaceable bridging element is disposed. The modular transmission system can include, for example, a first replaceable transmission module in the first chamber, wherein a second replaceable bridging element is housed in the second chamber to transmit torque from the first replaceable transmission module across the second chamber, for example, to an output of the modular transmission module. The first chamber can be associated with an input of the modular transmission system, and the second chamber can be associated with an output of the modular transmission system. The first chamber can be associated with an output of the modular transmission system, and the second chamber can be associated with an input of the modular transmission system. The replaceable first transmission module can have an input that can be connected to an input of the modular transmission system, and an output that can be connected to the replaceable second transmission module or the replaceable second bridging element. The replaceable first bridging element can have an input that can be connected to an input of the modular transmission system, and an output that can be connected to the replaceable second transmission module or the replaceable second bridging element. The replaceable second transmission module can have an output that can be connected to an output of the modular transmission system, and an input that can be connected to the replaceable first transmission module or the replaceable first bridging element. The replaceable second bridging element can have an output that can be connected to an output of the modular transmission system, and an input that can be connected to the replaceable first transmission module or the replaceable first bridging element. The housing of the modular transmission system can be particularly formed by a hub shell of a bicycle driven wheel.

[0094] For example, when the second chamber houses the second replaceable transmission module, the first chamber can house the first replaceable transmission module. For example, when the second chamber houses the second replaceable transmission module, the first chamber can house the first bridging element. For example, when the second chamber houses the second bridging element, the first chamber can house the first replaceable transmission module. For example, when the second chamber can house the second bridging element, the first chamber can house the first bridging element.

[0095] Optionally, the replaceable first transmission module includes a planetary transmission, such as the planetary transmission described herein or an additional planetary transmission described herein. Optionally, the replaceable second transmission module includes a planetary transmission, such as the planetary transmission described herein or an additional planetary transmission described herein.

[0096] Optionally, the replaceable first transmission module includes a three-speed planetary transmission or a two-speed planetary transmission. It should be understood that the three-speed planetary transmission or the two-speed planetary transmission can be the transmissions described herein.

[0097] Optionally, the replaceable second transmission module includes a three-speed planetary transmission or a two-speed planetary transmission. It should be understood that the three-speed planetary transmission or the two-speed planetary transmission can be the transmissions described herein.

[0098] Optionally, the first chamber houses a three-speed planetary transmission and the second chamber houses a second bridging element; or

[0099] The first chamber houses a first bridging element and the second chamber houses a three-speed planetary transmission; or

[0100] The first chamber houses a two-speed planetary transmission and the second chamber houses a second bridging element; or

[0101] The first chamber houses a first bridging element and the second chamber houses a two-speed planetary transmission; or

[0102] The first chamber houses a three-speed planetary transmission and the second chamber houses another one of the three-speed planetary transmissions; or

[0103] The first chamber houses a two-speed planetary transmission and the second chamber houses another one of the two-speed planetary transmissions; or

[0104] The first chamber houses a three-speed planetary transmission and the second chamber houses a two-speed planetary transmission; or

[0105] The first chamber houses a two-speed planetary transmission and the second chamber houses a three-speed planetary transmission; or

[0106] The first chamber houses a first bridging element and the second chamber houses a second bridging element.

[0107] Optionally, a CVT, such as the CVT described herein, is housed in the first chamber and / or the second chamber. For example, optionally, the first chamber houses a three-speed planetary transmission and the second chamber houses a CVT; or

[0108] The first chamber houses a CVT and the second chamber houses a three-speed planetary transmission; or

[0109] The first chamber houses a two-speed planetary transmission and the second chamber houses a CVT; or

[0110] The first chamber houses a CVT, and the second chamber houses a two-speed planetary transmission; or

[0111] The first chamber houses a first bridging element, and the second chamber houses a CVT; or

[0112] The first chamber houses a CVT, and the second chamber houses a second bridging element.

[0113] Optionally, the bicycle transmission system includes an electric propulsion motor for propelling or at least assisting in propelling the bicycle, wherein the electric propulsion motor is housed by the first chamber and / or the second chamber. For example, optionally, the first chamber houses a three-speed planetary transmission, and the second chamber houses the electric propulsion motor;

[0114] The first chamber houses the electric propulsion motor, and the second chamber houses a three-speed planetary transmission; or

[0115] The first chamber houses a two-speed planetary transmission, and the second chamber houses the electric propulsion motor; or

[0116] The first chamber houses the electric propulsion motor, and the second chamber houses a two-speed planetary transmission; or

[0117] The first chamber houses a first bridging element, and the second chamber houses the electric propulsion motor; or

[0118] The first chamber houses the electric propulsion motor, and the second chamber houses a second bridging element.

[0119] Optionally, the bicycle transmission system includes a generator configured to convert the power of one or more moving parts of the bicycle transmission system into electrical power. The generator can be housed by the first chamber and / or the second chamber. The generator can be separated from the electric propulsion motor. Alternatively, the generator can be integrated with the electric propulsion motor. The electrical power generated by the generator can be used to power one or more electric actuators, such as one or more electric shift actuators for shifting the gears of a three-speed planetary transmission and / or a two-speed planetary transmission.

[0120] Optionally, the housing is formed by a hub shell of a driven wheel of the bicycle. Optionally, the housing is formed by a crank transmission housing.

[0121] Optionally, the modular transmission system includes a replaceable drive module configured to be mounted to a set of sprockets, wherein the replaceable drive module is disposed external to the first and second chambers and is releasably connected to the replaceable first transmission module and / or the replaceable second transmission module. Thus, the modular transmission system can be selectively expanded using the drive module. The drive module can carry a set of sprockets, i.e., one or more sprockets, for engaging an endless drive member such as a chain or belt. A desired drive to be connected to the first replaceable transmission module and / or the second replaceable transmission module can be selected, e.g., a drive arranged to carry a desired number of sprockets. By adding a drive module, the range and / or number of transmission ratios obtainable using the modular transmission system can thus be increased.

[0122] Optionally, the drive module includes a continuously variable transmission (CVT) as described herein. For example, the drive module can include a drive for mounting to the set of sprockets. The drive can rotate about a first axis, and the housing of the modular transmission system can rotate about a second axis parallel to the first axis. Optionally, a first drive element of the CVT is connected to the drive and is rotatable about the first axis, and a second drive element of the CVT is connected to the housing and is rotatable about the second axis.

[0123] Optionally, the modular transmission system includes an antenna module having an antenna for receiving wireless transmission signals, wherein the antenna is disposed external to the housing. The antenna can be configured, for example, to receive wireless shift signals to effect gear changes using the modular transmission system. The position of the antenna external to the housing enables substantially unobstructed reception of wirelessly transmitted signals. Alternatively, the antenna can be housed by the housing, e.g., housed in the first and / or second chamber. In this case, the housing can include an antenna window to improve reception of the antenna. For example, the antenna window is more permeable to wireless transmission signals compared to other portions of the housing around or near the antenna window. For example, the housing can be made substantially of metal, while the antenna window is made of a non-metallic material.

[0124] Optionally, the antenna module includes a wired connection path extending from the antenna to a connector location within the first and / or second chamber for connection to an actuator of the replaceable first transmission module and / or the replaceable second transmission module. The antenna module can include, for example, a printed circuit board (PCB) forming the wired connection path from the antenna to the connector location.

[0125] Optionally, the modular transmission system includes a fixed axle, and a hub shell is rotatably disposed about the fixed axle, and wherein the antenna module is fixed or fixable to the fixed axle such that the antenna is disposed axially between the hub shell and one end of the fixed axle.

[0126] Optionally, the wired connection path extends in a radial direction between the bridge shaft and the bearing.

[0127] The antenna module described herein may be part of the bicycle transmission system described herein, but it should be understood that the antenna module may also be used in other bicycle transmission systems. Thus, in one aspect, there is provided an antenna module such as that described herein. The antenna module includes an antenna for receiving wireless transmission signals. The antenna module may include a wired connection path extending from the antenna to a connection location for connecting an actuator such as an electric actuator, such as a shift actuator. The antenna module may be arranged to be mounted to a wheel bridge shaft around which a hub shell is rotatably arranged such that the antenna is arranged outside the hub shell and the connection location is arranged inside the hub shell. In use, the antenna may be arranged between the hub shell and a dropout of the bicycle frame in the axial direction of the bridge shaft.

[0128] According to one aspect, there is provided a nine-speed planetary bicycle transmission system including a first three-speed planetary transmission that can be selectively operated according to three different first gear ratios and a second three-speed planetary transmission that can be selectively operated according to three different second gear ratios, wherein the first three-speed planetary transmission and the second three-speed planetary transmission are connected in series with each other. It should be understood that the three-speed planetary transmission may be the transmission described herein.

[0129] Optionally, the first gear ratio includes a unity gear ratio, and / or wherein the second gear ratio includes a unity gear ratio.

[0130] Optionally, the first gear ratio includes a speed increasing gear ratio and a speed decreasing gear ratio, and / or wherein the second gear ratio includes a speed decreasing gear ratio and a speed increasing gear ratio.

[0131] Optionally, one of the first gear ratios is a non-unity gear ratio that is approximately equal to the cube of one of the second gear ratios, or one of the first gear ratios is a non-unity gear ratio that is approximately equal to the cube root of one of the second gear ratios.

[0132] Optionally, the first three-speed planetary transmission includes a first clutch module and a second clutch module, and the first clutch module and the second clutch module are cooperatively configured to selectively operate the first three-speed planetary transmission according to three different first gear ratios; and the second three-speed planetary transmission includes a third clutch module and a fourth clutch module, and the third clutch module and the fourth clutch module are cooperatively configured to selectively operate the second three-speed planetary transmission according to three different second gear ratios.

[0133] Optionally, the first three-speed planetary transmission has three first rotating members, the second three-speed planetary transmission has three second rotating members, and the third of the first rotating members and the third of the second rotating members are non-rotatably fixed to a fixed part. Among them, the first clutch module includes a first actuatable clutch in the transmission path between the input of the first three-speed planetary transmission and the first of the first rotating members, and a first flywheel in the transmission path between the input of the first three-speed planetary transmission and the second of the first rotating members; the second clutch module includes a second actuatable clutch in the transmission path between the second of the first rotating members and the output of the first three-speed planetary transmission, and a second flywheel in the transmission path between the first of the first rotating members and the output of the first three-speed planetary transmission; the third clutch module includes a third actuatable clutch in the transmission path between the input of the second three-speed planetary transmission and the first of the second rotating members, and a fifth flywheel in the transmission path between the input of the second three-speed planetary transmission and the second of the second rotating members; the fourth clutch module includes a fourth actuatable clutch in the transmission path between the second of the second rotating members and the output of the second three-speed planetary transmission, and a sixth flywheel in the transmission path between the first of the second rotating members and the output of the second three-speed planetary transmission.

[0134] Optionally, the nine-speed planetary bicycle transmission includes: a third flywheel in the transmission path between the input of the first three-speed planetary transmission and the first actuatable clutch or in the transmission path between the first actuatable clutch and the first of the first rotating members; a fourth flywheel in the transmission path between the second of the first rotating members and the second actuatable clutch or in the transmission path between the second actuatable clutch and the output of the first three-speed planetary transmission; a seventh flywheel in the transmission path between the input of the second three-speed planetary transmission and the third actuatable clutch or in the transmission path between the third actuatable clutch and the first of the second rotating members; and / or an eighth flywheel in the transmission path between the input of the second three-speed planetary transmission and the fourth actuatable clutch or in the transmission path between the fourth actuatable clutch and the second of the second rotating members.

[0135] Optionally, the nine-speed planetary bicycle transmission includes a hub for the driven wheel of the bicycle, wherein the first three-speed planetary transmission and the second three-speed planetary transmission are accommodated by the hub.

[0136] According to one aspect, a six-speed planetary bicycle transmission system is provided, which includes a three-speed planetary transmission that can selectively operate according to three different first gear ratios and a two-speed planetary transmission that can selectively operate according to two different second gear ratios, wherein the three-speed planetary transmission and the two-speed planetary transmission are connected in series with each other. It should be understood that the three-speed planetary transmission or the two-speed planetary transmission can be the transmissions as described herein.

[0137] Optionally, the first gear ratio includes a unit gear ratio, and / or wherein the second gear ratio includes a unit gear ratio.

[0138] Optionally, the first gear ratio includes a speed-increasing gear ratio and a speed-decreasing gear ratio, and / or wherein the second gear ratio includes a speed-decreasing gear ratio and a speed-increasing gear ratio.

[0139] Optionally, the speed-increasing gear ratio in the second gear ratio increases the two-speed planetary transmission output speed by at least twice relative to the two-speed planetary transmission input speed.

[0140] Optionally, the speed-increasing gear ratio of the second gear ratio is approximately equal to the cube of the speed-increasing ratio of the first gear ratio.

[0141] Optionally, the three-speed planetary transmission includes a first clutch module and a second clutch module, and the first clutch module and the second clutch module are cooperatively configured to selectively operate the three-speed planetary transmission according to three different first gear ratios; and the two-speed planetary transmission includes a third clutch module, and the third clutch module is configured to selectively operate the two-speed planetary transmission according to two different second gear ratios.

[0142] Optionally, the three-speed planetary transmission has three first rotating members, the two-speed planetary transmission has three second rotating members, and the third of the first rotating members and the third of the second rotating members are non-rotatably fixed to a fixed part, wherein the first clutch module includes a first actuatable clutch in the transmission path between the three-speed planetary transmission input and the first of the first rotating members, and a first flywheel in the transmission path between the three-speed planetary transmission input and the second of the first rotating members; the second clutch module includes a second actuatable clutch in the transmission path between the second of the first rotating members and the six-speed planetary transmission output, and a second flywheel in the transmission path between the first of the first rotating members and the six-speed planetary transmission output; the third clutch module includes a third actuatable clutch in the transmission path between the two-speed planetary transmission input and the first of the second rotating members, and a fifth flywheel in the transmission path between the two-speed planetary transmission input and the second of the second rotating members.

[0143] Optionally, the six-speed planetary bicycle transmission includes a third flywheel that is in the transmission path between the three-speed planetary transmission input and the first actuatable clutch or in the transmission path between the first actuatable clutch and the first first rotating member; a fourth flywheel that is in the transmission path between the second first rotating member and the second actuatable clutch or in the transmission path between the second actuatable clutch and the three-speed planetary transmission output; a seventh flywheel that is in the transmission path between the two-speed planetary transmission input and the third actuatable clutch or in the transmission path between the third actuatable clutch and the first second rotating member.

[0144] Optionally, the six-speed planetary bicycle transmission includes a hub for the driven wheel of the bicycle, wherein the three-speed planetary transmission and the two-speed planetary transmission are received by the hub.

[0145] According to another aspect, there is provided a bicycle including a transmission system as described herein. It should be understood that the bicycle encompasses similar human-powered vehicles, particularly pedal-powered vehicles such as tricycles, quadricycles, and the like. The transmission system may be implemented as a hub transmission of the bicycle and / or a crank transmission of the bicycle.

[0146] According to one aspect, there is provided an electric vehicle, such as a light electric vehicle, for example an electric bicycle or a scooter. The electric vehicle includes an electric propulsion motor with a maximum output power of 10 kW, preferably a maximum of 4 kW; the electric propulsion motor is arranged to drive the driven wheels of the vehicle, wherein the bicycle transmission system as described herein is arranged in the transmission path between the electric propulsion motor and the driven wheels.

[0147] It should be understood that any of the aspects, features, and options described herein may be combined. It will be particularly understood that any aspect, feature, and option described for the bicycle transmission system equally applies to the modular bicycle transmission system, and vice versa. BRIEF DESCRIPTION OF THE DRAWINGS

[0148] Embodiments of the present invention will now be described in detail with reference to the drawings, in which:

[0149] FIGS. 1-15 illustrate schematic examples of a bicycle transmission system; and

[0150] FIG. 16 illustrates a bicycle. DETAILED DESCRIPTION

[0151] Figures 1A - 1C Schematic examples of the planetary transmission 1000 are shown. Each planetary transmission 1000 includes a planetary gear set 100 having three rotating members, such as a sun gear, a planet carrier carrying one or more planet gears, and a ring gear. Figure 1A andFigure 1B An example of a two-speed planetary transmission 1000 is shown. Figure 1C An example of a three-speed planetary transmission is shown.

[0152] Figure 1A A two-speed planetary transmission 1000 is shown, which includes a first clutch module that includes a first actuatable clutch C1 and a first flywheel 11. The first clutch module is arranged on the input side of the planetary gear set 100. The first actuatable clutch C1 is arranged here between the planetary transmission input 101 and the first rotating member, here the planet carrier. The first flywheel is arranged in a parallel transmission path between the planetary transmission input 101 and the second rotating member, here the ring gear. The second rotating member, here the ring gear, is connected or integrated with the planetary transmission output 102. The first clutch module here also includes an optional third flywheel 13. The third flywheel 13 is arranged in series with the first actuatable clutch, here on the input side of the clutch 13.

[0153] When the first actuatable clutch is closed, i.e., in the engaged state, torque can be transmitted from the input 101 to the first rotating member, here the planet carrier, via the clutch C1. The first rotating member, here the planet carrier, transmits the torque to the second rotating member, here the ring gear, according to a predetermined transmission ratio. Here, the transmission ratio is a speed-increasing transmission ratio. Thus, when the first clutch C1 is closed, the first flywheel 11 can rotate at an overspeed. When the clutch C1 is open, i.e., in the disengaged state, no torque can be transmitted from the input 101 to the first rotating member via the first clutch C1. Instead, when the first clutch C1 is open, torque can be transmitted from the input 101 to the second rotating member, here the ring gear, via the first flywheel 11. Thus, Figure 1A the exemplary planetary transmission can operate selectively according to a unitary transmission ratio and a speed-increasing transmission ratio. By actuating the first clutch C1, i.e., opening and closing the first clutch C1, the transmission system 1000 can be controlled to operate according to the unitary transmission ratio or the speed-increasing transmission ratio.

[0154] Figure 1BA two-speed planetary transmission 1000 is shown, which includes a second clutch module that includes a second actuatable clutch C2 and a second flywheel 12. The second clutch module is arranged on the output side of the planetary gear set 100. The second actuatable clutch C2 is arranged here between the planetary transmission output 102 and a second rotating member, here the ring gear. The second flywheel 12 is arranged in a parallel transmission path between the planetary transmission output 102 and a first rotating member, here the planet carrier. The second clutch module here also includes an optional fourth flywheel 14. The fourth flywheel 14 is arranged in series with the second actuatable clutch C2, here on the input side of the clutch 14.

[0155] When the second actuatable clutch C2 is closed, i.e., in the engaged state, torque can be transmitted from the input 101 via the second rotating member, here the ring gear, and via the clutch C2 to the output 102. The second rotating member, here the ring gear, also drives the first rotating member, here the planet carrier, to rotate according to a predetermined transmission ratio. Here, the transmission ratio is a speed-increasing transmission ratio. Therefore, when the first clutch C1 is closed, the second flywheel 12 can rotate at an overspeed. When the second clutch C2 is open, i.e., in the disengaged state, no torque can be transmitted via the second clutch C2. Instead, when the second clutch C2 is open, torque can be transmitted from the input 101 via the planetary gear set 100 and via the second flywheel 12 to the output 102. Therefore, Figure 1B the exemplary planetary transmission can be selectively operated according to a unit transmission ratio and a reduction transmission ratio. By actuating the second clutch C2, i.e., opening and closing the second clutch C1, the transmission system 1000 can be controlled to operate according to the unit transmission ratio or the reduction transmission ratio.

[0156] Figure 1C A transmission system 1000 is shown, including Figure 1A and 1B the first clutch module and the second clutch module shown in Figure 1C The exemplary planetary transmission can be selectively operated according to three different transmission ratios, here a reduction transmission ratio, a unit transmission ratio, and a speed-increasing transmission ratio. The speed-increasing transmission ratio and the reduction transmission ratio can be reciprocals of each other.

[0157] Figures 2A - 2B An example of a bicycle transmission system 1000 as shown in Figure 1C is shown, further including a biasing drive 300. The biasing drive includes an annular drive member such as a chain, a belt, or a cardan joint, which engages with a front chain wheel connected to a crank and a rear sprocket connected to a driven wheel. The biasing drive 300 optionally includes a derailleur for switching the annular drive member between sprockets and / or chain wheels of different sizes. InFigure 2A In the example of, the offset drive 300 is arranged at the input side of the planetary transmission. Thus, the planetary transmission can form a hub transmission. In Figure 2B In the example of, the offset drive 300 is arranged at the output side of the planetary transmission. Thus, the planetary transmission can form a crank transmission.

[0158] Figures 3A - 3C An example of a bicycle transmission system 1000 is schematically shown, which system includes a three-speed planetary transmission 100. The three-speed planetary transmission has three rotating members, namely a sun gear 103, a planet carrier 104 and a ring gear 106. The planet carrier 104 carries one or more planet gears 105. The three-speed planetary transmission particularly has only one sun gear 103 of a single diameter, only one planet carrier 104 and only one ring gear 106 of a single radius. In this example, only one sun gear 103 is permanently rotationally fixed to the fixed bridge shaft 40. By means of a first actuable clutch C1 and a second actuable clutch C2, the three-speed planetary transmission can be selectively operated according to three different transmission ratios between the three-speed planetary transmission input 101 and the three-speed planetary transmission output 102.

[0159] The first clutch module is associated with the three-speed planetary transmission input 101 and is configured to selectively transfer torque from the three-speed planetary transmission input 101 to one of the rotating members. Here, the first actuable clutch C1 is connected between the three-speed planetary transmission input 101 and the planet carrier 104. In the engaged state of the first actuable clutch C1, the first actuable clutch transfers torque from the planetary transmission input to the planet carrier 104; while in the disengaged state of the first actuable clutch C1, the first actuable clutch C1 disengages the planetary transmission input from the planet carrier 104.

[0160] The three-speed planetary transmission further includes a first flywheel 11 connected between the planetary transmission input and the ring gear 106. When the first actuable clutch is in the engaged state, the first flywheel 11 overspeeds such that the ring gear 106 can rotate faster than the planet carrier 104. When the first actuable clutch C1 is in the disengaged state, the first flywheel 11 transfers torque from the planetary transmission input to the ring gear 106.

[0161] The second clutch module is associated with the output 102 of the three-speed planetary transmission and is configured to selectively transfer torque from one of the three rotating members to the output 102 of the three-speed planetary transmission. Here, the second actuable clutch C2 is connected between the ring gear 106 and the output 102 of the three-speed planetary transmission. In the disengaged state of the second actuable clutch C2, the second actuable clutch C2 transfers torque from the ring gear 106 to the planetary transmission output; while in the disengaged state of the second actuating clutch C2, the second actuable clutch C2 disengages the ring gear 106 from the output of the planetary transmission.

[0162] In this example, the second actuable clutch C2 is the same as the first actuable clutch C1.

[0163] The three-speed planetary transmission further includes a second flywheel 12 connected between the planet carrier 104 and the output 102 of the planetary transmission. When the second actuable clutch C2 is in the engaged state, the second flywheel 12 overspeed, such that the ring gear 106 can rotate faster than the planet carrier 104. When the first actuable clutch C1 is in the disengaged state, the flywheel transfers torque from the planet carrier 104 to the output 102 of the planetary transmission.

[0164] Figures 3A - 3C It is shown that the transmission system 1000 further includes a bias drive 300, such as a chain drive, a universal drive, or a belt drive. The bias drive 300 can provide a transmission ratio from the crank of a bicycle driven by a user to the rear sprocket 3, for example, a non-unit transmission ratio. In this instance, the rear sprocket 3 is connected to the input 101 of the three-speed planetary transmission via a drive 41 here. The rear sprocket 3 can be part of a set of sprockets 3. In Figures 3A - 3C the example, the transmission system 1000 includes only one sprocket 3, but it should be understood that a set of multiple different-sized sprockets 3 can be provided. For example, a conventional derailleur can be used to select any desired sprocket 3, such as by switching the chain, belt, or universal joint.

[0165] In this example, the output 102 of the three-speed planetary transmission is coupled to the hub shell 25 of the bicycle driven wheel. The hub shell 25 is provided with a spoke flange 28 for attaching the spokes of the driven wheel. The hub shell 25 can also be coupled to a brake disc 29. The hub shell 25 at least partially defines a chamber here. The hub shell 25 particularly at least partially defines a first chamber 110 and a second chamber 120. In this example, the first chamber 110 and the second chamber 120 are part of a single chamber. In Figure 3BIn the example, the three-speed planetary transmission is arranged in the first chamber 110. The second chamber 120 houses the second bridging element 72. In this example, the three-speed planetary transmission output 102 is coupled to the hub shell 25 of the bicycle driven wheel. The hub shell 25 is provided with a spoke flange 28 for attaching the spokes of the driven wheel. The hub shell 25 may also be coupled to the brake disc 29. The hub shell 25 at least partially defines a chamber herein. The hub shell 25 particularly at least partially defines the first chamber 110 and the second chamber 120. In this example, the first chamber 110 and the second chamber 120 are part of a single chamber. In Figure 3B In the example, the three-speed planetary transmission is arranged in the first chamber 110. The second chamber 120 houses the second bridging element 72. Here, the second bridging element 72 transfers torque from the three-speed planetary transmission output 102 to the hub shell 25. Here, the second bridging element 72 bridges the second chamber 120 to transfer torque across the second chamber. In Figure 3C In the example, the three-speed planetary transmission is arranged in the second chamber 120. The first chamber 110 houses the first bridging element 71. Here, the first bridging element 71 transfers torque from the drive 41 to the three-speed planetary transmission input 101. Here, the first bridging element 71 bridges the first chamber 110 to transfer torque across the first chamber.

[0166] In this example, the three-speed planetary transmission includes a third flywheel 13 between the three-speed planetary transmission input 101 and the first actuable clutch C1. Alternatively, the third flywheel 13 may be arranged between the first actuable clutch C1 and the planet carrier 104. In this example, the three-speed planetary transmission further includes a fourth flywheel 14 arranged between the ring gear 106 and the second actuable clutch C2. Alternatively, the fourth flywheel 14 may be arranged between the ring gear 106 and the three-speed planetary transmission output 102. When the bicycle rolls backward, the third flywheel 13 and / or the fourth flywheel 14 prevent the three-speed planetary transmission from locking.

[0167] It should be understood that the flywheel as described herein is configured to disengage its drive input from its driven output when the driven output rotates faster than the drive input.

[0168] In this example, the first actuable clutch C1 and the second actuable clutch C2 can be electrically actuated between their respective engaged states and disengaged states. So far, the bicycle transmission system 1000 includes an antenna module 60, and the antenna module 60 includes an antenna 61 for receiving a wirelessly transmitted shift signal. The shift signal can be received, for example, from a shifter unit through which a user can command the transmission system 1000 to shift gears. The antenna module 60 here further includes a wired connection path 62 between the antenna 61 and the connection locations for connecting each clutch of the transmission system 1000. The clutches can be actuated according to the received shift signal. The clutches can be controlled according to the received shift signal to obtain a suitable transmission ratio for a three-speed planetary transmission.

[0169] The antenna module 60 is arranged here to be fixed to the fixed bridge shaft 40. In this example, the antenna 61 is arranged outside the hub chamber, where the wired connection extends from the antenna 61 to the clutches within the hub chamber. The antenna module 60 is arranged in the axial direction between the drive 41 and the end portion of the bridge shaft 40 in this example, and the bridge shaft 40 is to be mounted to the drop out of the bicycle frame. Thus, in use, in this example, the antenna 61 is arranged in the axial direction between the bicycle frame drop out and the drive 41.

[0170] The antenna 61 can alternatively be arranged within the hub chamber. To allow wireless signals, such as electromagnetic signals such as radio waves, to reach the antenna 61 with at least sufficient power to be correctly received by the antenna 61, the hub shell 25 can be at least partially permeable to the wireless signals, particularly the portion of the hub shell 25 surrounding the antenna 61 can be permeable to the wireless signals. For example, a portion of the hub shell 25 can form a window that is more permeable to the wireless signals than other portions of the hub shell 25 surrounding or adjacent to the window. In particular, when the hub shell 25 is at least partially permeable to the wireless signals, another portion of the hub shell 25 can include an electromagnetic shielding material, such as metal. Such an electromagnetic shielding material can be used to provide strength and / or stiffness to the hub shell 25 and may be more suitable for providing the strength and / or stiffness compared to materials that are more permeable to electromagnetic radiation.

[0171] For the exemplary planetary transmission system 1000 as Figures 3A - 3C shown in, by using the first actuable clutch C1 and the second actuable clutch C2, the exemplary transmission ratios shown in Table 1 below can be obtained.

[0172]

[0173] Here, the first transmission ratio and the third transmission ratio are reciprocals of each other.

[0174] Figures 4A - 4Cshows another example of a three-speed planetary transmission, similar to Figures 3A - 3C the example shown. Here, the planetary gear 105 is a stepped planetary gear 105. The stepped planetary gear 105 includes a large-radius portion and a small-radius portion. Here, the small-radius portion meshes with the sun gear 103, while the large-radius portion meshes with the gear 106. Each planetary gear 105 particularly includes two small-radius portions arranged on both sides of the large-radius portion to obtain a substantially symmetric planetary gear 105. Here, the single-diameter sun gear 103 is divided into two sun gear portions. The small-radius gear portions mesh with the respective sun gear portions of the single-diameter sun gear 103. Thus, the sun gear portions can provide symmetric support for the planetary gear 2105. In this example, the sun gear 103 is fixed to the fixed bridge shaft 40.

[0175] Figures 5A - 5C shows an example of a bicycle transmission system 1000 including a two-speed planetary transmission, similar to Figure 1A that described. In Figure 5B the example, the two-speed planetary transmission is arranged in the first hub shell chamber 110. The second hub shell chamber 120 houses the second bridging element 72, which bridges the second chamber 120 to transmit torque from the output portion 102 of the two-speed planetary transmission to the hub shell 25. In Figure 5C the example, the two-speed planetary transmission is arranged in the second chamber 120. The first chamber 110 houses the first bridging element 71, which bridges the first chamber 110 to transmit torque from the driver 41 to the input portion 101 of the two-speed planetary transmission. In Figure 5A the example, a second rotating member, here the ring gear 106, is directly connected to the hub shell 25. Thus, the second bridging element 72 may not be required here.

[0176] Figures 6A - 6C shows an example of a bicycle transmission system 1000 having a two-speed planetary transmission, similar to Figures 5A - 5C the example. Here, the two-speed planetary gear transmission includes a single-diameter sun gear 103, a planet carrier 104 carrying only one or more planetary gears 105, and a single-diameter ring gear 106. Each planetary gear 105 is here a stepped planetary gear, including a large-radius portion and a small-radius portion. Here, the small-radius portion meshes with the sun gear 103, while the large-radius portion meshes with the gear 106. Each planetary gear 105 particularly includes two small-radius portions arranged on both sides of the large-radius portion to obtain a substantially symmetric planetary gear 105. Here, the single-diameter sun gear 103 is divided into two sun gear portions. The small-radius gear portions mesh with the respective sun gear portions of the single-diameter sun gear 103. Thus, the sun gear portions can provide symmetric support for the planetary gear 105. In this example, the sun gear 103 is fixed to the fixed bridge shaft 40.

[0177] Figures 7A - 7C illustrates an example of a bicycle transmission system 1000 having a two-speed planetary transmission similar to the example of Figure 1B Here, the planetary transmission includes a second clutch module instead of a first clutch module. In this example, the planetary gear set includes a stepped planetary gear 105 and a single split sun gear 103, similar to the example of Figures 4A - 4C In the example of Figure 7B In the example of Figure 7C the two-speed planetary transmission is arranged in the first hub housing chamber 110, while the second hub housing chamber 120 houses a second bridging element 72, which bridges the second chamber 120 to transfer torque from the output of the two-speed planetary transmission 102 to the hub housing 25. In the example of

[0178] Figures 8A - 8B An example of a bicycle transmission system 1000 including a two-speed planetary transmission is schematically illustrated. In this example, the two-speed planetary transmission is a sunless planetary transmission, including a planet carrier 104 carrying one or more planetary gears 105, and a ring gear 106, here two ring gears 106a, 106b. Thus, in this example, the planetary gear set of the two-speed planetary transmission does not have a sun gear. In an alternative example, the planetary gear set of the two-speed planetary transmission can be ringless, which includes a planet carrier 104 carrying one or more planetary gears 105, and a sun gear 103, such as two sun gears, and does not include a ring gear.

[0179] In this example, the planet carrier 104 is fixedly mounted to the axle shaft 40. In this example, each planetary gear 105 is a stepped planetary gear having two gear portions with different radii rotatably coupled. Here, the small-radius portion of the stepped planetary gear 105 meshes with the first ring gear 106a, such as the input ring gear 106a, while the large-radius portion of the stepped planetary gear 105 meshes with the second ring gear 106b, such as the output ring gear 106b. Thus, in this example, the two-speed planetary gear transmission provides a non-unit transmission ratio, here a speed-increasing transmission ratio. The two-speed planetary transmission also provides a unit transmission ratio. A third actuatable clutch C3 is capable of switching between the two transmission ratios of the two-speed planetary transmission.

[0180] In Figures 8A - 8BIn an example, the transmission system includes an inner hub shell 26. The inner hub shell 26 is removably received in the hub shell chamber and is releasably coupled to the hub shell 25. The planetary transmission is housed by the inner hub shell 26. Thus, the planetary transmission can be removed from the hub shell 25 together with the inner hub shell 26. The inner hub shell 26 can be fixed or fixable to the driver 41. The hub shell 25 forms an outer hub shell here, which is provided with a spoke flange 28 for connection to the spokes of the drive wheel. It should be understood that the transmission systems of other examples can similarly include the inner hub shell 26.

[0181] Figures 9A - 9B An example of a bicycle transmission system 1000 is schematically shown, which system includes two planetary transmissions connected in series with each other. Here, the transmission system includes a three-speed planetary transmission and a two-speed planetary transmission. Thus, a six-speed planetary transmission system can be obtained. The two-speed planetary transmission and the three-speed planetary transmission are respectively received by a common hub shell 25 in a first chamber 110 and a second chamber 120. In this example, the output of the two-speed planetary transmission is connected to the input of the three-speed planetary transmission. However, it should be understood that the two-speed planetary transmission can alternatively be arranged on the output side of the three-speed planetary transmission.

[0182] Here, the planetary gear set 100A of the two-speed planetary transmission corresponds to the planetary gear set of the two-speed planetary gear transmission as shown and described in Figures 4A - 4C and Figures 7A - 7C shown and described. The planetary gear set 100B of the three-speed planetary transmission corresponds to the planetary gear set of the three-speed planetary gear set also as shown and described in Figures 3A - 3C shown and described.

[0183] The two-speed planetary transmission includes a first clutch module, which has a first actuatable clutch C1, a first flywheel 11, and a third flywheel 13. The three-speed planetary transmission includes a third clutch module, which has a third actuatable clutch C3, a fifth flywheel 15, and an optional seventh flywheel 17. The third clutch module is similar to the first clutch module described herein. The three-speed planetary transmission further includes a fourth clutch module, which includes a fourth actuatable clutch C4, a sixth flywheel 16, and an optional eighth flywheel 18. The fourth clutch module is similar to the second clutch module described herein.

[0184] Here, the two-speed planetary transmission can be selectively operated according to the unit transmission ratio and the speed-increasing transmission ratio. Thus, in this example, by arranging the two-speed planetary transmission on the input side of the three-speed planetary transmission, the torque load on the three-speed planetary transmission can be minimized. Figures 9A - 9BThe transmission system 1000 can operate selectively according to six different transmission ratios. Thus, a six-speed transmission operated only by three clutches can be obtained, namely, a first actuatable clutch C1, a third actuatable clutch C3, and a fourth actuatable clutch C4. The first actuatable clutch C1, the third actuatable clutch C3, and the fourth actuatable clutch C4 are identical to each other here. In addition, the first actuatable clutch C1, the third actuatable clutch C3, and the fourth actuatable clutch C4 are connected in series with each other.

[0185] Figures 10A - 10B Another example of a bicycle transmission system 1000 is schematically shown, which includes a two-speed planetary transmission connected in series with a three-speed planetary transmission. The two-speed planetary transmission and the three-speed planetary transmission are respectively received by a hub shell 25 in a first chamber 110 and a second chamber 120. Here, the planetary gear set 100A of the two-speed planetary transmission is sun-gearless and corresponds to the planetary gear set of the two-speed planetary gear transmission as Figures 8A - 8C shown and described. The planetary gear set 100B of the three-speed planetary transmission corresponds to the planetary gear of the three-speed planetary gear set as Figures 3A - 3C shown and described.

[0186] Figures 9A - 9B and Figures 10A - 10B The six different transmission ratios of the exemplary six-speed bicycle transmission system 1000 of

[0187]

[0188] Figures 11A - 11B and

[0189] can be selectively obtained by means of the first actuatable clutch C1, the third actuatable clutch C3, and the fourth actuatable clutch C4. For example, the three transmission ratios of the three-speed planetary transmission can be 0.76, 1.00, and 1.32, and the two transmission ratios of the two-speed planetary transmission can be 1.00 and 2.31. Table 2 shows the exemplary six-speed transmission system 1000 that can be obtained, where the six transmission ratios can be selected using the first actuatable clutch C1, the third actuatable clutch C3, and the fourth actuatable clutch C4. An example of a bicycle transmission system 1000 is schematically shown, which includes two three-speed planetary transmissions connected in series with each other. Thus, a nine-speed transmission system 1000 can be obtained.

[0189] The first of the two three-speed planetary transmissions includes a first clutch module having a first actuatable clutch C1, a first flywheel 11, and an optional third flywheel 13; and a second clutch module having a second actuatable clutch C2, a second flywheel 12, and an optional fourth flywheel 14. The second of the three-speed planetary transmissions includes a third clutch module having a third actuatable clutch C3, a fifth flywheel 15, and an optional seventh flywheel 17; and a fourth clutch module having a fourth actuatable clutch C4, a sixth flywheel 16, and an optional eighth flywheel 18. The third clutch module is similar to the first clutch module described herein. The fourth clutch module is similar to the second clutch module described herein.

[0190] Any one of the nine gear ratios of the nine-speed transmission system 1000 can be selected using only four clutches C1, C2, C3, C4. The four clutches here are identical to each other. Thus, the transmission system 1000 of this example includes four actuatable clutches C1, C2, C3, C4 in series. Here, all clutches C1 - C4 are independently actuatable. Thus, the system can change directly from one gear ratio to any other system gear ratio without passing through intermediate gear ratios. For example, the transmission system can change directly from the maximum gear ratio among the nine gear ratios here to the minimum gear ratio among the nine gear ratios here without passing through any intermediate gear ratios between the minimum and maximum gear ratios.

[0191] The gear ratios of the respective planetary gear sets of the two three-speed planetary transmissions can be selected such that the overdrive ratio of one of the three-speed planetary transmissions is approximately equal to the cube of the overdrive ratio of the other three-speed planetary transmission. For example, the three-speed planetary transmission housed in the first chamber provides three gear ratios: R1, R2, and R3, where R3 = 1 / R1, and where R2 = 1.00. For example, the additional planetary transmission can provide three gear ratios: R4, R5, and R6, where R4 = (R1)^3, R5 = 1.00, R6 = 1 / R4. R1 can in particular be selected as a suitable step between consecutive gear ratios. If R1 is selected, for example, as 1.14, specifying a 14% step, then R3, R4, and R6 are calculated as R3 = 0.88, R4 = 1.48, and R6 = 0.67. Using clutches C1 - C4, the exemplary nine gear ratios shown in Table 3 can be obtained accordingly.

[0192]

[0193]

[0194] Tables 4 - 6 show the use of Figures 11A - 11BMore examples of the transmission ratios obtainable with a nine-speed planetary transmission. Using the first actuatable clutch C1 and the second actuatable clutch C2, the first of the three-speed planetary transmissions can be selectively operated in accordance with the transmission ratios R1, R2, and R3. Using the third actuatable clutch C3 and the fourth actuatable clutch C4, the second of the three-speed planetary transmissions can be selectively operated in accordance with the transmission ratios R4, R5, and R6.

[0195]

[0196]

[0197] By omitting only the second clutch module from the Figures 11A - 11B example, a six-speed transmission can be obtained. Table 7 gives examples of the transmission ratios obtained using such a six-speed transmission. Note that Table 7 corresponds to the lower part of Table 4, i.e., the gear positions 1-6 of Table 7 correspond to the gear positions 4-9 of Table 3.

[0198]

[0199] Figures 12A - 12B An example of a bicycle transmission system 1000 is schematically shown, which includes two two-speed planetary transmissions connected in series with each other. Thus, a four-speed transmission system 1000 can be obtained. In this example, the planetary gear sets of the two-speed planetary transmissions are similar to each other and correspond to the exemplary planetary gear sets of the two-speed planetary transmission system 1000 as Figures 6A - 6C shown. However, it should be understood that any of the two-speed planetary transmissions in this example can be replaced by another two-speed planetary transmission, for example, as shown in FIGS. 5-8.

[0200] Figures 13A - 13BAn example of a bicycle transmission system 1000 including a continuously variable transmission (CVT) 403 is schematically shown. The CVT 403 is here in particular a ratchet type. The CVT 403 includes a first driving element 410 and a second driving element 402. Here, the first driving element forms the input part of the CVT 403, and the second driving element forms the output part of the CVT 403. The first driving element 410 is rotatable about a first axis A1. The second driving element 402 is rotatable about a second axis A2. Torque can be transmitted from the first driving element 410 to the second driving element 402 by means of a first coupling element 411. The coupling element 411 is arranged concentrically with respect to the first axis A1 and maintains a constant first radius with respect to the first axis A1. The first driving element 410 and the second driving element 402 can move relative to each other in a direction transverse to the first axis A1 and the second axis A2, for example, can be translated or pivoted, for example, to provide a deviation between the first axis A1 and the second axis A2. By means of the coupling element 411, torque can be transmitted from the first driving element 410 to the second driving element 402 at a variable second radius R2 from the second axis 406, and vice versa. Therefore, torque can be transmitted from a constant first radius to a variable second radius. Therefore, depending on the deviation between the first driving element 410 and the second driving element 402, various ratios between the first radius and the second radius can be obtained, resulting in various transmission ratios between the first driving element 310 and the second driving element 402.

[0201] Here, the first driving element 410 is associated with the driver 41, for example, integrated with the driver 41. In addition, here, the second driving element 402 can be connected to the hub shell 25, for example, via a three-speed planetary transmission and / or a two-speed planetary transmission 100. It should be understood that the first driving element 410 may also be connected to the hub shell 25, for example, via a three-speed planetary transmission and / or a two-speed planetary transmission 100, and the second driving element 402 is associated with the driver 41, for example, integrated with the driver 41. In this example, the driver 41 can move relative to the hub shell 25 in a direction transverse to the first axis A1 and the second axis A2 to change the transmission ratio of the CVT 403.

[0202] Figure 13B The driver 41 is shown, here integrated with the first driving element 410 of the CVT 403 and in a concentric position with respect to the second driving element 402 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 unit transmission ratio, that is, a transmission ratio of 1:1. The driver 41 can move from the concentric position to an eccentric position, in which the first axis A1 deviates from the second axis A2. In the eccentric position, the CVT 403 operates according to a non-unit transmission ratio, in particular a speed increasing ratio.

[0203] In Figures 13A - 13B the example of, the transmission system includes a three-speed planetary transmission as described herein. The three-speed planetary transmission is housed in a hub housing 25, which in this example is located in the second chamber 120. The first chamber 110 here includes a first bridging element 71. The output of the CVT 403 is connected to the first bridging element 71 in this example, and the first bridging element is in turn connected to the three-speed planetary transmission input. Although the CVT 403 may include one or more flywheels that allow coasting, an additional flywheel may be provided between the output of the CVT 403 and the first chamber 110 to improve coasting efficiency.

[0204] Figures 14A - 14B Another example of a bicycle transmission system 1000 is schematically shown, where, in addition to Figures 13A - 13B the example shown, the transmission system 1000 includes a three-speed planetary transmission connected in series to a two-speed planetary transmission. Here, the two-speed planetary transmission is housed in the first chamber 110. Thus, the transmission system 1000 of this example is similar to Figures 9A - 9B the example of, where Figures 14A - 14B the example of also includes a CVT 403.

[0205] The CVT 403 can operate according to a predetermined discrete transmission ratio. In combination with one or more transmissions in the first chamber and / or the second chamber, the bicycle transmission system can operate according to any desired number of discrete transmission ratios. The number and step size of the bicycle transmission ratios can be predetermined or defined and / or modified by the user, for example using an application running on a mobile device such as a smartphone.

[0206] As Figures 14A - 14B shown, the exemplary bicycle transmission system 1000 has been configured to operate according to the twelve-speed transmission system 1000 shown in Table 8. In this example, the three-speed planetary transmission can operate according to transmission ratios of 0.76, 1.00, and 1.32, while the two-speed planetary transmission can operate according to transmission ratios of 1.00 and 2.31.

[0207]

[0208]

[0209] For the exemplary twelve-speed transmission system of Table 8, the CVT 403 operates according to a subset of predefined transmission ratios within a continuous range of transmission ratios. Here, the CVT 403 operates according to only two transmission ratios, namely the unity transmission ratio, i.e., 1.00, and the overdrive ratio 1.15. Thus, compared with Figures 9A - 9BCompared with the example in Table 2, the CVT 403 provides an intermediate gear ratio step between the six gear ratios obtained from the three-speed planetary gearbox and the two-speed planetary gearbox 100 in series arrangement in this example.

[0210] Similarly, Table 9 shows another example of the gear ratios that can be obtained using the bicycle transmission system 1000 as shown in Figures 10A - 10B In this example, the three-speed planetary gearbox can operate according to gear ratios of 0.76, 1.00, and 1.32, while the two-speed planetary gearbox can operate according to gear ratios of 1.00 and 2.31.

[0211]

[0212]

[0213] Using the example in Table 9, an eighteen-speed transmission system 1000 can be obtained, in which the CVT 403 operates according to a subset of pre-defined gear ratios within a continuous gear ratio range, switching between three different gear ratios here, namely the unit gear ratio, i.e., 1.00, and two overdrive gear ratios of 1.10 and 1.20.

[0214] Similarly, Table 10 shows a twenty-four-speed transmission system 1000 that can be obtained using the bicycle transmission system 1000 as shown in Figures 10A - 10B In this example, the CVT 403 operates according to four different gear ratios. In this example, the three-speed planetary gearbox can operate according to gear ratios of 0.76, 1.00, and 1.32, while the two-speed planetary gearbox can operate according to gear ratios of 1.00 and 2.31.

[0215]

[0216]

[0217] Therefore, through the transmission system 1000 including the CVT 403, such as the transmission system shown in Figures 14A - 14B various customizable sets of system gear ratios can be obtained. For example, as shown in Figures 14A - 14B the twelve-speed in Table 8, the eighteen-speed in Table 9, and the twenty-four-speed in Table 10 can all be obtained using the same transmission system 1000.

[0218] Figures 15A - 15BFIG. 0 schematically shows an example electric propulsion motor module 50 of a bicycle transmission system 1000 including the electric propulsion motor module 50. The electric propulsion motor module 50 includes a motor 51 configured to propel or at least assist in propelling a bicycle. Here, the electric propulsion motor module 50 is housed in a first chamber 110, but it should be understood that the propulsion motor module 50 may alternatively be housed in a second chamber 120, or both the first chamber 110 and the second chamber 110 may house the or a propulsion motor module 50. Here, the electric propulsion motor module 50 is coupled or couplable to a two-speed planetary transmission input 101, but it should be understood that the electric propulsion module may be combined with any other planetary transmission and / or CVT 403 described herein. In this example, the electric propulsion motor module 50 includes a reduction gear 52 between the electric propulsion motor 51 and the two-speed planetary transmission input 101. The electric propulsion motor 51 is also configured herein to function as a generator for converting mechanical energy into electrical energy, such as for powering a clutch actuator for an actuatable clutch. Alternatively, the transmission system 1000 may include a dedicated generator, such as instead of or in addition to the electric propulsion motor 51.

[0219] In the examples of FIGS. 4-8, the transmission system includes a set of multiple sprockets 3, such as a cassette. It should be understood that multiple sprockets may also be used in other examples. In the examples of FIGS. 3, 9-14, the transmission system includes a set of single sprockets 3. It should be understood that a set of single sprockets may also be used in other examples. In Figure 13B and Figure 14B the examples of, the transmission system includes a CVT 403. It should be understood that a CVT may also be used in other examples.

[0220] In Figure 3B , 3C , 9B, 9B, 11B, 13B, and 14B, a three-speed planetary transmission is housed in a hub shell having a first chamber and a second chamber. It should be understood that the three-speed planetary transmission may also be housed in a hub shell having a single chamber, solely for the three-speed planetary transmission. Alternatively, the three-speed planetary transmission may be housed within a drive body attachable to the hub shell. The three-speed planetary transmission housed in a hub shell having a single chamber or housed in a drive body may be used in combination with a single sprocket, multiple sprockets, or a CVT.

[0221] Figure 16AA bicycle 10000 is shown. The bicycle 10000 includes a frame 10002 having a front fork 10005 and a rear fork 10007, and a front wheel 10011 and a rear wheel 10013 located in the front fork and the rear fork respectively. The bicycle 10000 further includes a crank 10017 and a front chainring 10019. The bicycle 10000 includes a transmission system 1000 which is implemented as a hub transmission in this example. The bicycle 10000 also includes a set of sprockets 3, and a chain 10023 passes over the front chainring 10019 and one of the sprockets 3. The bicycle herein includes a derailleur 10024. Alternatively, the bicycle may be without a derailleur.

[0222] Figure 16B A hub assembly is schematically shown, here the rear wheel 10013 of the bicycle 10000, wherein the transmission system 1000 is arranged between a left fork portion 5 and a right fork portion 6 of the rear fork 100017 of the bicycle frame 10002. The transmission system 1000 herein includes an antenna module 60, wherein an antenna 61 is arranged in the axial direction between the drive side fork portion, here the right fork portion 6 and the hub shell 25, more specifically, between the drive side fork portion and the driver 41.

[0223] The drawings show various examples of a bicycle transmission system 1000, in particular a modular bicycle transmission, where various features, elements and modules can be combined, including CVTs, bridging elements and propulsion motors / generators etc., and it is understood that other combinations can also be envisaged.

[0224] Herein, the present invention has been described with reference to specific examples of embodiments of the present invention. However, it is obvious that various modifications and changes can be made therein without departing from the essence of the present invention. For the purpose of clear and concise description, the features are described herein as part of the same or different embodiments, however, alternative embodiments having combinations of all or some of the features described in these different embodiments are also envisaged.

[0225] However, other modifications, variations and alternatives are also possible. Therefore, the description, the drawings and the examples should be regarded in an illustrative sense rather than in a limiting sense.

[0226] In the claims, any reference signs in parentheses shall not be construed as limiting the claims. The word "comprising" does not exclude the presence of other features or steps than those listed in the claims. Furthermore, the words "a" and "an" shall not be construed as limited to "only one", but are used to mean "at least one", and do not exclude a plurality. The mere fact that certain means are recited in mutually different claims does not indicate that a combination of these means cannot be used to advantage.

Claims

1. A bicycle transmission system, comprising: A planetary transmission having three rotating members, wherein a third of the rotating members is non-rotatably fixed to a fixed part; Wherein the planetary transmission further comprises a first clutch module and / or a second clutch module; The first clutch module includes a first actuable clutch in a transmission path between an input of the planetary transmission and a first of the rotating members, and a first flywheel in a transmission path between the input of the planetary transmission and a second of the rotating members, and The second clutch module includes a second actuable clutch in a transmission path between the second of the rotating members and an output of the planetary transmission, and a second flywheel in a transmission path between the first of the rotating members and the output of the planetary transmission.

2. The transmission system according to claim 1, wherein, The third of the rotating members is a sun gear.

3. The transmission system according to claim 1 or 2, characterized in that, The first of the rotating members is a planet carrier carrying one or more planet gears, and the second of the rotating members is a ring gear.

4. The transmission system according to any one of the preceding claims, characterized in that, The first actuable clutch and the second actuable clutch are the same.

5. The transmission system according to any one of the preceding claims, characterized in that, The first actuable clutch and the second actuable clutch are form-closed clutches configured to transmit torque in two rotational directions.

6. The transmission system according to any one of the preceding claims, characterized in that, Including a first electric actuator arranged to actuate the first actuable clutch, and a second electric actuator arranged to actuate the second actuable clutch.

7. The transmission system according to any one of the preceding claims, characterized in that, The first actuable clutch and the second actuable clutch are independently actuable.

8. The transmission system according to any one of the preceding claims, characterized in that, The first clutch module includes a third flywheel in a transmission path between the input of the planetary transmission and the first actuable clutch or in a transmission path between the first actuable clutch and the first of the rotating members.

9. The transmission system according to any one of the preceding claims, characterized in that, The second clutch module includes a fourth flywheel in a transmission path between the second of the rotating members and the second actuable clutch or in a transmission path between the second actuable clutch and the output of the planetary transmission.

10. The transmission system according to any one of the preceding claims, characterized in that, The planetary transmission can be selectively operated according to a unit transmission ratio.

11. The transmission system according to any one of the preceding claims, characterized in that, Each of the first actuable clutch and the second actuable clutch is configured to couple and decouple under load.

12. The transmission system according to any one of the preceding claims, characterized in that, Each of the first actuable clutch and / or the second actuable clutch has respective clutch input and output portions, and includes: A first rotatable unit that can be connected to the input portion and includes at least one first abutting surface; A second rotatable unit that can be connected to the output portion and includes at least one second abutting surface, the second abutting surface being arranged to selectively engage the first abutting surface, the first abutting surface and the second abutting surface being adapted to each other to allow disengagement under load; A third rotatable unit, the third rotatable unit including at least one retaining member, the third rotatable unit being arranged to be selectively in a first position or a second position relative to the second rotatable unit, wherein in the first position, the at least one retaining member locks the at least one second abutting surface into engagement with the at least one first abutting surface to rotatably couple the second rotatable unit to the first rotatable unit, and releases the at least one second abutting surface in the second position to disengage the at least one first abutting surface, thereby decoupling the second rotatable unit from the first rotatable unit.

13. The transmission system according to claim 12, wherein Each actuatable clutch includes an actuator for rotating the third rotatable unit and / or the second rotatable unit from the first position to the second position, and / or from the second position to the first position, wherein optionally, the actuator can be triggered from outside the clutch system, such as via a control unit.

14. The transmission system according to claim 12 or 13, characterized in that, The third rotatable unit includes at least one actuating member, at least one of the actuating members being arranged to move the third rotatable unit relative to the second rotatable unit from a first position to a second position or from a second position to a first position.

15. The transmission system according to claim 14, characterized in that, Each actuatable clutch includes a fourth unit, the fourth unit including a selector arranged to be selectively in a gripping mode or a non-gripping mode. The selector in the gripping mode is arranged to grip at least one actuating member to rotate the third rotatable unit relative to the second rotatable unit from the first position to the second position or from the second position to the first position. The selector in the non-gripping mode is arranged to not engage at least one actuating member.

16. The transmission system according to any one of claims 12-15, characterized in that, The first clutch input is connected to the planetary transmission input, and the first clutch output is connected to the first of the rotating members; and / or wherein the second clutch input is connected to the second of the rotating members, and the second clutch output is connected to the planetary transmission output.

17. The transmission system according to any one of the preceding claims dependent on claim 3, characterized in that, The one or more planetary gears are stepped planetary gears and include a large-radius gear portion and a small-radius gear portion that are rotationally fixed to each other.

18. The transmission system according to claim 17, wherein, The stepped planetary gear includes two, for example identical, small-radius gear portions that are rotatably fixed to the large-diameter gear portion on opposite sides of the large-radius gear portion.

19. The transmission system according to any one of the preceding claims, characterized in that, The planetary transmission can operate selectively according to a speed-increasing transmission ratio.

20. The transmission system according to claim 19, wherein The planetary transmission can also operate selectively according to a speed-decreasing transmission ratio, wherein the speed-increasing transmission ratio and the speed-decreasing transmission ratio are reciprocals of each other.

21. The transmission system according to any one of the preceding claims, characterized in that, Including a hub housing for a driven wheel of a bicycle, the hub housing at least partially defining a hub chamber, wherein the planetary transmission is received in the hub chamber by the hub housing.

22. The transmission system according to claim 21, wherein, It further includes an inner hub housing configured to be received in the hub chamber and removably coupled to the hub housing for transferring torque from the inner hub housing to the hub housing, wherein the planetary transmission is accommodated within the inner hub housing and coupled to the inner hub housing for being removable from the hub housing together with the inner hub housing.

23. The transmission system according to any one of the preceding claims, characterized in that, It includes an additional planetary transmission having three additional rotating members, wherein the third of the additional rotating members is non-rotatably fixed to the fixed bridge shaft. Wherein the additional planetary transmission includes a third clutch module and / or a fourth clutch module; The third clutch module includes a third actuatable clutch in the transmission path between the additional planetary transmission input and the first of the additional rotating members, and a fifth flywheel in the transmission path between the additional planetary transmission input and the second of the additional rotating members. The fourth clutch module includes a fourth actuatable clutch in the transmission path between the second of the additional rotating members and the additional planetary transmission output, and a sixth flywheel in the transmission path between the first of the additional rotating members and the additional planetary transmission output.

24. The transmission system according to claim 23, characterized in that, The planetary transmission output is connected or connectable to the additional planetary transmission input.

25. The transmission system according to claim 23 or 24, characterized in that, The third of the additional rotating members is a sun gear.

26. The transmission system according to any one of claims 23-25, characterized in that, The first of the additional rotating members is an additional planet carrier carrying one or more additional planet gears, and the second of the additional rotating members is an additional ring gear.

27. The transmission system according to claim 26, wherein, The one or more additional planet gears are stepped additional planet gears, and the additional planet gears include a large-radius gear portion and a small-radius gear portion that are rotationally fixed to each other.

28. The transmission system according to claim 27, wherein The stepped additional planet gears include two, for example, identical, small-radius additional gear portions that are rotatably fixed to the large-radius gear portion on opposite sides of the large-radius gear portion.

29. The transmission system according to any one of claims 23-28, characterized in that, The diameter of at least one rotating member of the additional planetary transmission is different from the diameter of the corresponding rotating member in the planetary transmission.

30. The transmission system according to any one of claims 23-29, characterized in that, The third clutch module includes a seventh flywheel in the transmission path between the additional planetary transmission input and the third actuatable clutch or in the transmission path between the third actuatable clutch and the first of the additional rotating members.

31. The transmission system according to any one of claims 23-30, characterized in that, The fourth clutch module includes an eighth flywheel in the transmission path between the additional planetary transmission input and the fourth actuatable clutch or in the transmission path between the fourth actuatable clutch and the second of the additional rotating members.

32. The transmission system according to any one of claims 23-31, characterized in that, The third actuatable clutch is the same as the fourth actuatable clutch.

33. The transmission system according to any one of claims 23-32, characterized in that, The first actuatable clutch, the second actuatable clutch, the third actuatable clutch and the fourth actuatable clutch are the same as each other.

34. The transmission system according to any one of claims 23-33, characterized in that, The additional planetary transmission can be selectively operated according to a unit transmission ratio.

35. The transmission system according to any one of claims 23 - 34, characterized in that, The additional planetary transmission can be selectively operated according to a speed-up transmission ratio.

36. The transmission system according to claim 35, characterized in that, The speed increasing transmission ratio increases the output speed of the additional planetary transmission by at least 1.5 times, preferably at least 2 times, relative to the input speed of the additional planetary transmission.

37. The transmission system according to claim 35 or 36, characterized in that, The speed increasing transmission ratio of the additional planetary transmission is approximately equal to the cube of the speed increasing transmission ratio of the planetary transmission, or alternatively, the speed increasing transmission ratio of the additional planetary transmission is approximately equal to the cube root of the speed increasing transmission ratio of the planetary transmission.

38. The transmission system according to any one of claims 23 - 37, which depends on claim 18, is characterized in that, The additional planetary transmission is received by the hub housing.

39. The transmission system according to any one of the preceding claims, characterized in that, Comprising a continuously variable transmission (CVT) connected in series with the planetary transmission, the continuously variable transmission being operable selectively at a plurality of different transmission ratios within a continuous continuously variable transmission range.

40. The transmission system according to claim 39, wherein The continuously variable transmission is releasably coupled to the planetary transmission.

41. The transmission system according to claim 39 or 40, characterized in that, The continuously variable transmission output is connected or connectable to the planetary transmission input.

42. The transmission system according to any one of the preceding claims, characterized in that, Comprising a biasing drive and a drive, the biasing drive having a set of sprockets and an endless drive member, such as a chain or belt, the endless drive member configured to engage a sprocket of the set of sprockets, the drive configured to be rotationally connected to the set of sprockets, wherein the biasing drive is connected in series with the planetary transmission.

43. When the transmission system according to claim 42 is dependent on claim 35, 36 or 37, it is characterized in that, The drive is rotationally integrated with the continuously variable transmission, such as rotationally integrated with the continuously variable transmission input.

44. The transmission according to any one of claims 39 - 43, characterized in that, The continuously variable transmission includes a first drive element that is rotatable about a first axis; a second drive element that is 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; a coupling element disposed at a first radius that is constant from the first axis and a second radius that is variable from the second axis, or at a first radius that is constant from the second axis and a second radius that is variable from the first axis, for transmitting torque between the first drive element and the second drive element.

45. The transmission system according to claim 44, wherein, Comprising a bridge shaft having a first bridge shaft portion and a second bridge shaft portion, wherein the continuously variable transmission is associated with the first bridge shaft portion and the planetary transmission is associated with the second bridge shaft portion, wherein the first bridge shaft portion and the second bridge shaft portion are removably connected to each other.

46. The transmission system according to claim 44 or 45, characterized in that, The coupling element is connected 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 connected 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 connectable to the first drive element in a second tangential direction opposite to the first tangential direction.

47. A modular bicycle transmission system, comprising a housing defining a first chamber and a second chamber, Among them, the first chamber selectively receiving a replaceable first transmission module or a replaceable first bridging element; and wherein the second chamber selectively receives a replaceable second transmission module or a replaceable second bridging element.

48. The modular transmission system according to claim 47, characterized in that, The replaceable first transmission module includes a two-speed planetary transmission, such as the two-speed planetary transmission according to any one of claims 1-22, or a three-speed planetary transmission, such as the three-speed planetary transmission according to any one of claims 1-22.

49. The modular transmission system according to claim 47 or 48, characterized in that, The replaceable second transmission module includes a two-speed planetary transmission, such as the two-speed planetary transmission according to any one of claims 1-22, or a three-speed planetary transmission, such as the three-speed planetary transmission according to any one of claims 1-22.

50. The variable modular transmission system according to any one of claims 47-49, wherein: The first chamber houses the three-speed planetary transmission, and the second chamber houses the second bridging element; or The first chamber houses the first bridging element, and the second chamber houses the three-speed planetary transmission; or The first chamber houses the two-speed planetary transmission, and the second chamber houses the second bridging element; or The first chamber houses the first bridging element, and the second chamber houses the two-speed planetary transmission; or The first chamber houses the three-speed planetary transmission, and the second chamber houses the other of the three-speed planetary transmissions; or The first chamber houses the two-speed planetary transmission, and the second chamber houses the other of the two-speed planetary transmissions; or The first chamber houses the three-speed planetary transmission, and the second chamber houses the two-speed planetary transmission; or The first chamber houses the two-speed planetary transmission, and the second chamber houses the three-speed planetary transmission; or The first chamber houses the first bridging element, and the second chamber houses the second bridging element.

51. The modular transmission system according to any one of claims 47 - 50, characterized in that, The housing is formed by a hub shell for a driven wheel of a bicycle.

52. The modular transmission system according to any one of claims 47 - 51, characterized in that, It includes a replaceable drive module configured to be mounted to a set of sprockets, wherein the replaceable drive module is arranged outside the first chamber and the second chamber and is releasably connected to the replaceable three-speed transmission module and / or the replaceable two-speed transmission module.

53. The modular transmission system according to claim 52, wherein The drive module includes a continuously variable transmission according to any one of claims 39-46.

54. The transmission system according to any one of the preceding claims, characterized in that, It includes an antenna module having an antenna for receiving a wireless transmission signal, wherein the antenna is arranged outside the housing.

55. The transmission system according to claim 54, characterized in that, The antenna module is rotationally fixed to the fixed part.

56. The modular transmission system according to claim 55 or 54, when dependent on any one of claims 47 - 53, is characterized in that, The antenna module includes a wired connection path extending from the antenna to a connector position inside the first chamber and / or the second chamber for connecting to an actuator of the replaceable first transmission module and / or the replaceable second transmission module.

57. When the modular transmission system according to any one of claims 54 - 56 depends on claim 51, it is characterized in that, It includes a fixed axle, the hub shell is rotationally arranged around the fixed axle, and wherein the antenna module is fixed to the fixed axle such that the antenna is arranged between the hub shell and one end of the fixed axle in the axial direction of the axle.

58. A nine-speed planetary bicycle transmission system includes a first three-speed planetary transmission that can selectively operate according to three different first transmission ratios and a second three-speed planetary transmission that can selectively operate according to three different second transmission ratios, wherein, The first three-speed planetary transmission and the second three-speed planetary transmission are connected in series with each other.

59. The nine-speed planetary bicycle transmission system according to claim 58, characterized in that, The first transmission ratio includes a unit transmission ratio, and / or wherein the second transmission ratio includes a unit transmission ratio.

60. The nine-speed planetary bicycle transmission system according to claim 58 or 59, characterized in that, The first transmission ratio includes a speed increasing transmission ratio and a speed decreasing transmission ratio, and / or wherein, the second transmission ratio includes a speed decreasing transmission ratio and a speed increasing transmission ratio.

61. The nine-speed planetary bicycle transmission system according to any one of claims 58-60, characterized in that, One of the first transmission ratios is a non-unit transmission ratio approximately equal to the cube of one of the second transmission ratios, or one of the first transmission ratios is a non-unit transmission ratio approximately equal to the cube root of one of the second transmission ratios.

62. The nine-speed planetary bicycle transmission system according to any one of claims 58-61, characterized in that, The first three-speed planetary transmission includes a first clutch module and a second clutch module, and the first clutch module and the second clutch module cooperate to be configured to selectively operate the first three-speed planetary transmission according to the three different first transmission ratios; and the second three-speed planetary transmission includes a third clutch module and a fourth clutch module, and the third clutch module and the fourth clutch module cooperate to be configured to selectively operate the second three-speed planetary transmission according to the three different second transmission ratios.

63. The nine-speed planetary bicycle transmission system according to claim 62, characterized in that, The first three-speed planetary transmission has three first rotating members, the second three-speed planetary transmission has three second rotating members, and the third one of the first rotating members and the third one of the second rotating members are non-rotatably fixed to a fixed part. Wherein, the first clutch module includes a first actuatable clutch in a transmission path between the input of the first three-speed planetary transmission and the first of the first rotating members, and a first flywheel in a transmission path between the input of the first three-speed planetary transmission and the second of the first rotating members. The second clutch module includes a second actuatable clutch in a transmission path between the second of the first rotating members and the output of the first three-speed planetary transmission, and a second flywheel in a transmission path between the first of the first rotating members and the output of the first three-speed planetary transmission. The third clutch module includes a third actuatable clutch in a transmission path between the input of the second three-speed planetary transmission and the first of the second rotating members, and a fifth flywheel in a transmission path between the input of the second three-speed planetary transmission and the second of the second rotating members. The fourth clutch module includes a fourth actuatable clutch in a transmission path between the second of the second rotating members and the output of the second three-speed planetary transmission, and a sixth flywheel in a transmission path between the first of the second rotating members and the output of the second three-speed planetary transmission.

64. The nine-speed planetary bicycle transmission system according to claim 63, comprising: A third flywheel, the third flywheel being in a transmission path between the input of the first three-speed planetary transmission and the first actuatable clutch, or in a transmission path between the first actuatable clutch and the first of the first rotating members; A fourth flywheel, the fourth flywheel being in a transmission path between the second of the first rotating members and the second actuatable clutch, or in a transmission path between the second actuatable clutch and the output of the first three-speed planetary transmission; A seventh flywheel, the seventh flywheel being in the transmission path between the input of the second three-speed planetary transmission and the third actuatable clutch or in the transmission path between the third actuatable clutch and the first of the second rotating members; and / or An eighth flywheel, the eighth flywheel being in the transmission path between the input of the second three-speed planetary transmission and the fourth actuatable clutch or in the transmission path between the fourth actuatable clutch and the second of the second rotating members.

65. A nine-speed planetary bicycle transmission system according to any one of claims 58-64, including a hub shell for a bicycle driven wheel, characterized in that, The first three-speed planetary transmission and the second three-speed planetary transmission are accommodated by the hub shell.

66. The nine-speed planetary bicycle transmission system according to any one of claims 58-65, characterized in that, The first three-speed planetary transmission includes a bicycle transmission system according to any one of claims 1-46, and the second three-speed planetary transmission includes a bicycle transmission system according to any one of claims 1-46.

67. A six-speed planetary bicycle transmission system includes a three-speed planetary transmission that can selectively operate according to three different first transmission ratios and a two-speed planetary transmission that can selectively operate according to two different second transmission ratios, characterized in that, The three-speed planetary transmission and the two-speed planetary transmission are connected in series with each other.

68. The six-speed planetary bicycle transmission system according to claim 67, wherein, The first transmission ratio includes a unit transmission ratio, and / or wherein the second transmission ratio includes a unit transmission ratio.

69. The six-speed planetary bicycle transmission system according to claim 67 or 68, characterized in that, The first transmission ratio includes a speed-increasing transmission ratio and a speed-reducing transmission ratio, and / or wherein the second transmission ratio includes a speed-reducing transmission ratio or a speed-increasing transmission ratio.

70. The six-speed planetary bicycle transmission system according to any one of claims 67-69, characterized in that, The speed-increasing transmission ratio of the second transmission ratio increases the two-speed planetary transmission output speed by at least twice relative to the two-speed planetary transmission input speed.

71. The six-speed planetary bicycle transmission system according to any one of claims 67-70, characterized in that, The speed-increasing transmission ratio of the second transmission ratio is approximately equal to the cube of the speed-increasing ratio of the first transmission ratio.

72. The six-speed planetary bicycle transmission system according to any one of claims 67-71, characterized in that, The three-speed planetary transmission includes a first clutch module and a second clutch module, the first clutch module being cooperatively configured with the second clutch assembly to selectively operate the three-speed planetary transmission according to the three different first transmission ratios; and the two-speed planetary transmission includes a third clutch module, the third clutch module being configured to selectively operate the two-speed planetary transmission according to two different second transmission ratios.

73. The six-speed planetary bicycle transmission system according to claim 72, characterized in that, The three-speed planetary transmission has three first rotating members, the two-speed planetary transmission has three second rotating members, and the third of the first rotating members and the third of the second rotating members are non-rotatably fixed to a fixed part, wherein the first clutch module includes a first actuatable clutch in the transmission path between the input of the three-speed planetary transmission and the first of the first rotating members, and a first flywheel in the transmission path between the input of the three-speed planetary transmission and the second of the first rotating members, the second clutch module includes a second actuatable clutch in the transmission path between the second of the first rotating members and the output of the six-speed planetary transmission, and a second flywheel in the transmission path between the first of the first rotating members and the output of the six-speed planetary transmission, the third clutch module includes a third actuatable clutch in the transmission path between the input of the two-speed planetary transmission and the first of the second rotating members, and a fifth flywheel in the transmission path between the input of the two-speed planetary transmission and the second of the second rotating members.

74. The six-speed planetary bicycle transmission system according to claim 73, comprising: A third flywheel, the third flywheel being in the transmission path between the three-speed planetary transmission input portion and the first actuatable clutch, or in the transmission path between the first actuatable clutch and the first of the first rotating members; A fourth flywheel, the fourth flywheel being in the transmission path between the second of the first rotating members and the second actuatable clutch, or in the transmission path between the second actuatable clutch and the three-speed planetary transmission output portion; A seventh flywheel, the seventh flywheel being in the transmission path between the two-speed planetary transmission input portion and the third actuatable clutch, or in the transmission path between the third actuatable clutch and the first of the second rotating members.

75. A six-speed planetary bicycle transmission system according to any one of claims 67-74, including a hub shell for a driven wheel of a bicycle, characterized in that, The three-speed planetary transmission and the two-speed planetary transmission are received by the hub shell.

76. The six-speed planetary bicycle transmission system according to any one of claims 67-75, characterized in that, The three-speed planetary transmission comprises a bicycle transmission system according to any one of claims 1-46, and the two-speed planetary transmission comprises a bicycle transmission system according to any one of claims 1-46.

77. A bicycle, comprising a transmission or a transmission system according to any one of the preceding claims.

78. An electric vehicle, comprising an electric propulsion motor with a maximum output power of 10 kW, preferably a maximum of 4 kW; the electric propulsion motor is arranged to drive the driven wheels of the vehicle, wherein, A bicycle transmission system according to any one of claims 1-76 is arranged in the transmission path between the electric propulsion motor and the driven wheel.

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