Bottom bracket gear for a bicycle, bottom bracket and bicycle

Abstract

Bottom bracket gear for a bicycle, characterized by an input shaft (1) which can be connected in a rotationally fixed manner to a bottom bracket crankshaft (2), a first planetary gear set (PS1) and a second planetary gear set (PS2), wherein the input shaft (1) is connected in a rotationally fixed manner to a gear set element of the first planetary gear set (PS1) and a gear set element of the second planetary gear set (PS2), and a main gear set (HR) comprising a third planetary gear set (PS3), a fourth planetary gear set (PS4) operatively connected to the third planetary gear set (PS3), a first shaft (3), a second shaft (4), a third shaft (5) and a transmission output shaft (6), wherein another gear set element of the first planetary gear set (PS1) is rotatably connected to the first shaft (3) by means of a first shifting element (Mz) and a first freewheel (F1) and is rotatably connected to the first shaft (3) by means of a second shifting element (Ms) and a second freewheel (F2) and is rotatably connected to the second shaft (4) by means of a third shifting element (A) and a third freewheel (F3) and another gear set element of the second planetary gear set (PS2), in particular by means of a fourth switching element (E) and a fourth freewheel (F4) is rotatably connected to the third shaft (5) and by means of a fifth switching element (Bz) and a fifth freewheel (F5) is rotatably connected to the first shaft (3) and by means of a sixth switching element (Bs) and a sixth freewheel (F6) is rotatably connected to the first shaft (3) and the input shaft (1) is rotatably connected to the third shaft (5) by means of a seventh shifting element (D) and a seventh freewheel (F7) and is rotatably connected to the first shaft (3) by means of an eighth shifting element (Cz) and an eighth freewheel (F8) and is rotatably connected to the first shaft (3) by means of a ninth shifting element (Cs) and a ninth freewheel (F9).

Description

[0001] The invention relates to a bottom bracket gear for a bicycle. Furthermore, the invention relates to a bottom bracket with the bottom bracket gear according to the invention. Furthermore, the invention relates to a bicycle with the bottom bracket gear or the bottom bracket.

[0002] A variety of bicycles and pedelecs are known from the state of the art, which are usually equipped with derailleur or hub gears. Pedelecs differ from bicycles in that they have an electric motor to assist the rider. In some applications, pedelecs have a hub motor installed in the front or rear wheel. Hub motors in the front wheel have a negative impact on handling due to their high weight. In contrast, hub motors mounted in the rear wheel have so far been used with derailleur gears that are difficult to maintain and also have a negative impact on handling due to their high weight. For this reason, pedelecs have already been developed in which a countershaft transmission and an electric motor are arranged in a bottom bracket. In addition, countershaft transmissions arranged in the bottom bracket are known and can be combined with electric motors.

[0003] The disadvantage of conventional countershaft-type bottom bracket gears is their low power density and, due to the fact that only rolling power is generated, their efficiency is poor. Furthermore, the conventional bottom bracket gears exhibit constant gear steps, which are disadvantageous in terms of the driving resistance.

[0004] DE 10 2015 217 013 A1 describes a transmission arrangement for a motor vehicle for the switchable transmission of a torque from a drive shaft to an output shaft, comprising two pluralities of planetary gear sets, wherein the first plurality of planetary gear sets is connected in a rotationally fixed manner to the drive shaft and the second plurality of planetary gear sets is connected in a rotationally fixed manner to the output shaft, wherein both pluralities of planetary gear sets comprise ring gears which can be fixed independently of one another on a base and planetary gears which are mounted on a common web.

[0005] DE 10 2014 223 334 A1 describes a drive train for a bicycle, consisting of a bottom bracket shaft rotatably mounted in a bottom bracket shell, which projects beyond the bottom bracket shell on both sides and can be connected to a pedal crank there, as well as a switchable planetary gear, the gear input shaft of which is coupled to the bottom bracket shaft in a torque-transmitting manner and the gear output shaft of which is coupled to a hub shell rotatably mounted about the rear wheel axle of the pedal bike in a torque-transmitting manner, wherein the planetary gear is arranged parallel to the bottom bracket shaft in the bottom bracket shell.

[0006] DE 10 2012 201 373 A1 describes a hybrid drive train for a bicycle with a hub gear system comprising a front-mounted gear set and a rear-mounted gear set formed from at least two individual planetary gear sets, wherein two power paths are provided between the transmission input and the rear-mounted gear set, each having fixed gear ratios, wherein the rear-mounted gear set comprises at least six shafts which can be connected to the power paths and to one another via various shifting elements.

[0007] JP H06 - 263 080 A describes a transmission for a bicycle which allows multi-stage gear changes by arranging a planetary gear between a carrier attached to the pedal crank and a gear housing.

[0008] DE 10 2014 101 726 A1 describes a powershift multi-speed planetary transmission for a bicycle, consisting of a three-stage base transmission and a two-stage extension transmission, which, through the combination of both transmissions, enables a total of 142 forward gears and 69 reverse gears.

[0009] DE 10 2016 207 035 A1 describes a drive arrangement of an electric bicycle with a pedal crankshaft for receiving a first torque and a transmission device which transmits the torque to a drive wheel of the vehicle via a multi-stage, switchable planetary gear, wherein the transmission ratio can be adjusted by controlled connection and release of the sun gears of the planetary stages.

[0010] The object of the invention is therefore to provide a bottom bracket gear that does not have the disadvantages mentioned above.

[0011] This object is achieved by the subject matter having the features of the independent patent claims, inter alia by a transmission which is characterized by an input shaft which is rotatably connectable to a bottom bracket crankshaft, a first planetary gear set and a second planetary gear set, wherein the input shaft is rotatably connected to a gear set element of the first planetary gear set and a gear set element of the second planetary gear set, and a main gear set which has a third planetary gear set, a fourth planetary gear set operatively connected to the third planetary gear set, a first shaft, a second shaft, a third shaft and a transmission output shaft,wherein another gear set element of the first planetary gear set is rotatably connected to the first shaft by means of a first shifting element and a first freewheel, and is rotatably connected to the first shaft by means of a second shifting element and a second freewheel, and is rotatably connected to the second shaft by means of a third shifting element and a third freewheel, and another gear set element of the second planetary gear set is rotatably connected to the third shaft, in particular by means of a fourth shifting element and a fourth freewheel, andis rotatably connected to the first shaft by means of a fifth switching element and a fifth freewheel, and is rotatably connected to the first shaft by means of a sixth switching element and a sixth freewheel, and the input shaft is rotatably connected to the third shaft by means of a seventh switching element and a seventh freewheel, and is rotatably connected to the first shaft by means of an eighth switching element and an eighth freewheel, and is rotatably connected to the first shaft by means of a ninth switching element and a ninth freewheel.

[0012] The bottom bracket gear according to the invention has the advantage of being more efficient than the countershaft gears known from the prior art due to the use of planetary gear sets. A further advantage of the bottom bracket gear according to the invention is that smaller gear steps are achieved towards higher gears.

[0013] A shaft is not exclusively understood to mean, for example, a cylindrical, rotatably mounted machine element for transmitting torque, but rather also general connecting elements that connect individual elements to one another, in particular connecting elements that connect several elements to one another in a rotationally fixed manner.

[0014] A rotationally fixed connection is defined as a connection between two elements that is designed and arranged in such a way that the two connected elements always have the same rotational speed. This is not the case, for example, if a switching element is arranged between the two connected elements and is in the open state. The rotationally fixed connection can be realized, for example, by means of a spline.

[0015] A operative connection is a connection between two elements that always exists. Elements that are constantly connected in this way always rotate with the same dependence between their speeds.

[0016] In a special design, several gears, particularly all of them, provided by the bottom bracket transmission can be shifted to at least the next gear without the need for group shifting. This eliminates the need to operate multiple shifting elements when changing gears, simplifying the entire shifting process.

[0017] A gear is shiftable without a range shift if, when shifting from an initial gear to another gear, only a single power path between two elements is interrupted and a single other power path is established between two elements. The power path can be interrupted by opening a single shifting element and / or by the driven element of the two elements connected to the freewheel being put into an overrunning state with respect to the driving element. This means that the locking effect of the freewheel is canceled and the two elements rotate at different speeds. The power path can be established by closing a single shifting element and / or by the two elements of the freewheel that are in the overrunning state being put into a locked state, so that both elements of the freewheel rotate at the same speed.

[0018] The first shifting element and the first freewheel can be arranged such that they are part of a first power path between the other gear set element of the first planetary gear set and the first shaft. The first power path is realized when the first shifting element is closed and the first freewheel locks. The second shifting element and the second freewheel can be arranged such that they are part of a second power path between the other gear set element of the first planetary gear set and the first shaft. The second power path is realized when the second shifting element is closed and the second freewheel locks. The second power path can run parallel to the first power path, in particular in some areas. Furthermore, the second freewheel acts in the opposite direction to the first freewheel.This means that the second freewheel locks in a direction of rotation that is opposite to the direction of rotation in which the first freewheel locks.

[0019] The fifth shifting element and the fifth freewheel can be arranged such that they are part of a third power path between the other gear set element of the second planetary gear set and the first shaft. The third power path is realized when the fifth shifting element is closed and the fifth freewheel locks. The sixth shifting element and the sixth freewheel can be arranged such that they are part of a fourth power path between the other gear set element of the second planetary gear set and the first shaft. The fourth power path is realized when the sixth shifting element is closed and the sixth freewheel locks. The third power path can run parallel to the fourth power path, in particular in some areas. Furthermore, the fifth freewheel acts in an opposite direction to the sixth freewheel.This means that the fifth freewheel locks in a direction that is opposite to the direction in which the sixth freewheel locks.

[0020] The eighth switching element and the eighth freewheel can be arranged such that they are part of a fifth power path between the input shaft and the first shaft. The fifth power path is realized when the eighth switching element is closed and the eighth freewheel locks. The ninth switching element and the ninth freewheel can be arranged such that they are part of a sixth power path between the input shaft and the first shaft. The sixth power path is realized when the ninth switching element is closed and the ninth freewheel locks. The fifth power path can run parallel to the sixth power path, in particular in some areas. The eighth freewheel acts in the opposite direction to the ninth freewheel, so that the eighth freewheel locks in a direction that is opposite to the direction in which the ninth freewheel locks.

[0021] Furthermore, the seventh shifting element and the seventh freewheel can be part of a seventh power path, and / or the third shifting element and the third freewheel can be part of an eighth power path. The fourth shifting element and the fourth freewheel can be part of a ninth power path. The aforementioned freewheels can be connected downstream of the respective assigned shifting element in terms of drive technology.

[0022] In a special design, the first planetary gear set and / or the second planetary gear set can provide a high-speed gear ratio. High-speed gear ratio occurs when the gear ratio of the planetary gear set is less than 1.

[0023] The gear set element of the first planetary gear set can be a carrier, and the other gear set element of the first planetary gear set can be a ring gear. The sun gear of the first planetary gear set can be non-rotatably connected to a housing. The housing can be a bottom bracket gear housing, which is fixedly arranged during operation of the bottom bracket gear. Alternatively, the housing can be part of the bottom bracket shell.

[0024] To implement at least one gear of the bottom bracket transmission, the ring gear of the first planetary gear set can be rotationally fixedly connected to the first shaft either by means of the first shifting element and the first freewheel, or by means of the second shifting element and the second freewheel. Alternatively or additionally, the ring gear of the first planetary gear set can be rotationally fixedly connected to the second shaft by means of the third shifting element and the third freewheel.

[0025] The gear set element of the second planetary gear set can be a carrier, and the other gear set element of the second planetary gear set can be a ring gear. A sun gear of the second planetary gear set can be non-rotatably connected to the housing, such as the bottom bracket gear housing or the bottom bracket shell.

[0026] To implement at least one gear of the bottom bracket transmission, the ring gear of the second planetary gear set can be rotationally fixedly connected to the third shaft by means of the fourth shifting element and the fourth freewheel. Alternatively or additionally, the ring gear of the second planetary gear set can be rotationally fixedly connected to the first shaft by means of the fifth shifting element and the fifth freewheel, or to the first shaft by means of the sixth shifting element and the sixth freewheel.

[0027] Furthermore, to implement at least one gear, the input shaft can be non-rotatably connected to the third shaft by means of the seventh shifting element and the seventh freewheel. Alternatively or additionally, the input shaft can be non-rotatably connected to the first shaft by means of the eighth shifting element and the eighth freewheel, or to the first shaft by means of the ninth shifting element and the ninth freewheel.

[0028] The second shaft can be connected in a rotationally fixed manner to the housing, in particular the bottom bracket housing or the bottom bracket gear housing, by means of a tenth freewheel.

[0029] In a special design, the main gearset can be formed from a two-web, four-shaft gearset. A two-web, four-shaft gearset is a planetary gear train consisting of two individual planetary gearsets, in this case the third and fourth planetary gearsets, in which four of its gearset elements are freely accessible to other gear elements. The two individual planetary gearsets are kinematically connected to each other via exactly two shafts. In each gear of a two-web, four-shaft gearset, two of the gearshift elements connected to the gearset elements of the two-web, four-shaft gearset must be closed. To graphically represent the kinematics of the transmission, a speed diagram of the transmission is usually used, for example the Kutzbach diagram known from gear theory.

[0030] The speed diagram plots the speed ratios of the individual shafts vertically. The horizontal distances between the shafts result from the gear ratios between the shafts, so that the speed ratios and torque ratios of the shafts belonging to a specific operating point can be connected by a straight line. The gear ratios between the shafts result from the stationary gear ratios of the planetary gear sets involved.

[0031] The stationary gear ratio defines the speed ratio between the sun gear and the ring gear of a planetary gear set when the carrier is fixed. Since the direction of rotation between the sun gear and the ring gear is reversed when the carrier is fixed, the stationary gear ratio always assumes a negative value for a negative gear set.

[0032] The first, third, transmission output shaft, and second shaft are characterized in that the speeds of these shafts increase, decrease, or are equal to one another in the sequence mentioned. In other words, the speed of the first shaft is less than or equal to the speed of the third shaft. The speed of the third shaft is in turn less than or equal to the speed of the transmission output shaft. The speed of the transmission output shaft is less than or equal to the speed of the second shaft. This sequence is also reversible, so that the second shaft has the highest speed, while the first shaft assumes a speed that is less than or equal to the speed of the second shaft. There is always a linear relationship between the speeds of all four shafts.

[0033] The two-carrier four-shaft gear set can be designed as a Simpson gear set. In this case, a sun gear of the third planetary gear set is non-rotatably connected to the first shaft, and a carrier of the third planetary gear set is non-rotatably connected to the transmission output shaft. A ring gear of the third planetary gear set is non-rotatably connected to the second shaft, and a sun gear of the fourth planetary gear set is non-rotatably connected to the first shaft. A carrier of the fourth planetary gear set is non-rotatably connected to the third shaft, and a ring gear of the fourth planetary gear set is non-rotatably connected to the transmission output shaft.

[0034] Alternatively, the main gear set can be designed as a Ravigneaux gear set. In this case, the sun gear of the third planetary gear set is non-rotatably connected to the second shaft, and the carrier of the third planetary gear set is non-rotatably connected to the third shaft. The ring gear of the third planetary gear set is non-rotatably connected to the transmission output shaft, and the sun gear of the fourth planetary gear set is non-rotatably connected to the first shaft. The carrier of the fourth planetary gear set is non-rotatably connected to the third shaft, and the ring gear of the fourth planetary gear set is non-rotatably connected to the transmission output shaft. The fourth planetary gear set is equipped with a single planet (minus planetary gear set), while the third planetary gear set is equipped with a double planet (plus planetary gear set).

[0035] A minus gear set describes a planetary gear set with a carrier on which the planet gears are rotatably mounted, with a sun gear and with a ring gear, wherein the toothing of at least one of the planet gears meshes with the toothing of the sun gear as well as with the toothing of the ring gear, whereby the ring gear and the sun gear rotate in opposite directions of rotation when the sun gear rotates with the carrier stationary.

[0036] A positive planetary gear set differs from the negative planetary gear set just described in that the positive planetary gear set has inner and outer planetary gears that are rotatably mounted on the carrier. The teeth of the inner planetary gears mesh with the teeth of the sun gear and the teeth of the outer planetary gears. The teeth of the outer planetary gears also mesh with the teeth of the ring gear. This means that when the carrier is stationary, the ring gear and the sun gear rotate in the same direction.

[0037] Alternatively, the main gear set can be designed as a CR-CR gear set. In this case, the sun gear of the third planetary gear set is non-rotatably connected to the second shaft, and the carrier of the third planetary gear set is non-rotatably connected to the transmission output shaft. The ring gear of the third planetary gear set is non-rotatably connected to the third shaft, and the sun gear of the fourth planetary gear set is non-rotatably connected to the first shaft. The carrier of the fourth planetary gear set is non-rotatably connected to the third shaft, and the ring gear of the fourth planetary gear set is non-rotatably connected to the transmission output shaft.

[0038] Alternatively, the main gear set can be designed as an SR-CC gear set. In this case, the sun gear of the third planetary gear set is non-rotatably connected to the first shaft, and the carrier of the third planetary gear set is non-rotatably connected to the transmission output shaft. The ring gear of the third planetary gear set is non-rotatably connected to the second shaft, and the sun gear of the fourth planetary gear set is non-rotatably connected to the second shaft. The carrier of the fourth planetary gear set is non-rotatably connected to the transmission output shaft, and the ring gear of the fourth planetary gear set is non-rotatably connected to the third shaft.

[0039] In a particular embodiment, the first planetary gear set can have at least one, in particular several, stepped planets. Furthermore, the second planetary gear set can have at least one, in particular several, stepped planets. The stepped planets of the first planetary gear set are supported by the carrier of the first planetary gear set, and / or the stepped planets of the second planetary gear set are supported by the carrier of the second planetary gear set. The stepped planets can improve space efficiency.

[0040] A bottom bracket transmission that has an electric motor operatively connected to the transmission output shaft or the input shaft is particularly advantageous. The electric motor can easily assist the rider during riding. The electric motor can be operatively connected to the output shaft or input shaft by means of a pre-transmission gear and / or a traction device, such as a chain or a toothed belt, and / or gearing. In particular, the output shaft and / or input shaft can have gearing, in particular a chainring, that is operatively connected to the electric motor. The electric motor can be arranged axially parallel to the bottom bracket crankshaft. Furthermore, the electric motor can be arranged in or on the down tube of the bottom bracket.

[0041] Alternatively, the transmission can, in particular, have two electric motors. One electric motor can be operatively connected to the output shaft, and another electric motor can be operatively connected to the input shaft. The operative connection can be implemented in the manner described above. As a result, the provision of two electric motors enables power shifting. In particular, boosting and recuperation can be achieved via the electric motors. A reduction in pedaling torque by the rider during gear shifting and the associated drop in torque at the wheel can be compensated for by the electric motor.

[0042] The electrical machine consists of at least a rotationally fixed stator and a rotatably mounted rotor and is designed to convert electrical energy into mechanical energy in the form of speed and torque in motor operation, and to convert mechanical energy into electrical energy in the form of current and voltage in generator operation.

[0043] The bottom bracket gear can have, in particular, exactly nine shifting elements and, in particular, exactly ten freewheels to realize, in particular, exactly 15 gears. Alternatively, the bottom bracket gear can have at least 11, in particular exactly 11, gears. Regardless of whether the bottom bracket gear has 11 or 15 gears, each of the gears can be shiftable at least to the next gear without the need for a group shift. In particular, one of the 15 gears mentioned below can be optionally implemented in the bottom bracket gear. The shifting elements can each be designed as a claw shifting element.

[0044] A first gear can be realized in which the eighth shifting element is closed and the tenth freewheel locks, wherein the third shifting element, the seventh shifting element, the fourth shifting element, the first shifting element and the fifth shifting element are open and the ninth shifting element, the second shifting element and the sixth shifting element are open or closed. Furthermore, a second gear can be realized in which the first shifting element is closed and the tenth freewheel locks, wherein the third shifting element, the seventh shifting element, the fourth shifting element, the ninth shifting element and the fifth shifting element are open and the second shifting element and the sixth shifting element are open or closed and the eighth shifting element is closed, wherein the eighth freewheel locks. Thus, no power is transmitted from the input shaft to the first shaft by means of the eighth shifting element and the eighth freewheel.

[0045] The bottom bracket transmission can also implement a third gear, in which the fifth shifting element is closed and the tenth freewheel is locked, with the third shifting element, the seventh shifting element, the fourth shifting element, the ninth shifting element, and the second shifting element being open, and the eighth shifting element and the sixth shifting element being open or closed, and the first shifting element being closed, with the first freewheel being freewheeling. Thus, no power is transmitted from the ring gear of the first planetary gear set to the first shaft by means of the first shifting element and the first freewheel.

[0046] Furthermore, a fourth gear can be realized in which the seventh shift element is closed and the tenth freewheel is locked, the third shift element, the fourth shift element, the ninth shift element, the second shift element, and the sixth shift element are open, and the eighth shift element and the first shift element are closed or open, and the fifth shift element is closed, with the fifth freewheel freewheeling. Thus, no power is transmitted from the ring gear of the second planetary gear set to the first shaft by means of the fifth shift element and the fifth freewheel.

[0047] Furthermore, a fifth gear can be realized in which the seventh and sixth shift elements are closed, the third, fourth, second, and ninth shift elements are open, and the eighth, first, and fifth shift elements are open or closed, while the tenth freewheel rotates freely. Thus, the second shaft is no longer supported on the housing by the freewheel, but can rotate freely. This means that the freewheel rotates freely.

[0048] Furthermore, a sixth gear can be realized in which the seventh shifting element and the second shifting element are closed, the third shifting element, the fourth shifting element, the ninth shifting element, and the fifth shifting element are open, and the eighth shifting element and the first shifting element are closed or open, and the tenth freewheel is freewheeling and the sixth shifting element is closed, with the sixth freewheel freewheeling. Thus, no power is transmitted from the ring gear of the second planetary gear set to the first shaft by means of the sixth shifting element and the sixth freewheel.

[0049] In the bottom bracket transmission, a seventh gear can be realized in which the seventh shifting element and the ninth shifting element are closed, the third shifting element, the fourth shifting element, the first shifting element, and the fifth shifting element are open, and the eighth shifting element and the sixth shifting element are closed or open, and the tenth freewheel is freewheeling and the second shifting element is closed, with the second freewheel freewheeling. Thus, no power is transmitted from the ring gear of the second planetary gear set to the first shaft by means of the second shifting element and the second freewheel.

[0050] Furthermore, an eighth gear can be realized in which the third shift element and the seventh shift element are closed, the fourth shift element, the eighth shift element, the first shift element, and the fifth shift element are open, and the second shift element and the sixth shift element are closed or open, the tenth freewheel is freewheeling, and the ninth shift element is closed, with the ninth freewheel freewheeling. Thus, no power is transferred from the input shaft to the first shaft by means of the ninth shift element and the ninth freewheel.

[0051] Furthermore, a ninth gear can be realized in which the third shift element and the eighth shift element are closed, the fourth shift element, the first shift element, and the fifth shift element are open, and the ninth shift element, the second shift element, and the sixth shift element are closed or open, and the tenth freewheel is freewheeling and the seventh shift element is closed, with the seventh freewheel freewheeling. Thus, no power is transferred from the input shaft to the third shaft by means of the seventh shift element and the seventh freewheel.

[0052] A tenth gear can also be realized in which the third switching element and the first switching element are closed, the fourth switching element, the ninth switching element and the fifth switching element are open and the second switching element and the sixth switching element and the seventh switching element are closed or open and the tenth freewheel is freewheeling and the eighth switching element is closed, the eighth freewheel being freewheeling.

[0053] In the bottom bracket gear, an eleventh gear can be realized in which the third switching element and the fifth switching element are closed, the fourth switching element, the ninth switching element and the second switching element are open and the seventh switching element and the eighth switching element and the sixth switching element are closed or open and the tenth freewheel is free-running and the first switching element is closed, the first freewheel being free-running.

[0054] In addition, a twelfth gear can be realized in which the third switching element and the fourth switching element are closed, the ninth switching element, the second switching element and the sixth switching element are open, and the seventh switching element and the eighth switching element and the first switching element are closed or open, and the tenth freewheel is freewheeling, and the fifth switching element is closed, the fifth freewheel being freewheeling.

[0055] In addition, a thirteenth gear can be realized in which the fourth switching element and the sixth switching element are closed, the ninth switching element and the second switching element are open, and the seventh switching element and the eighth switching element, the first switching element and the fifth switching element are closed or open, the tenth freewheel is freewheeling, the third switching element is closed, the third freewheel is freewheeling.

[0056] In the bottom bracket gear, a fourteenth gear can also be realized in which the fourth switching element and the second switching element are closed, the ninth switching element and the fifth switching element are open, and the third switching element and the seventh switching element and the eighth switching element and the first switching element are closed or open, and the tenth freewheel is free-running and the sixth switching element is closed, the sixth freewheel being free-running.

[0057] A fifteenth gear can also be realized in which the fourth switching element and the ninth switching element are closed and the first switching element and the fifth switching element are open and the third switching element and the seventh switching element and the eighth switching element and the sixth switching element are open or closed and the tenth freewheel is freewheeling and the second switching element is closed, whereby the second freewheel is freewheeling.

[0058] A bottom bracket with the bottom bracket gear and the bottom bracket crankshaft is particularly advantageous, with the input shaft being non-rotatably connected to the bottom bracket crankshaft. The bottom bracket gear can be located in a cavity of a bottom bracket shell. This allows for compact housing of the bottom bracket gear in the bicycle. A bicycle with either the bottom bracket gear or the bottom bracket is also particularly advantageous.

[0059] The figures schematically illustrate the subject matter of the invention, with identical or equivalent elements generally being provided with the same reference numerals. In the figures: Fig. 1 a bottom bracket gear according to the invention according to a first embodiment, Fig. 2 a bottom bracket gear according to the invention according to a second embodiment, Fig. 3 a bottom bracket gear according to the invention according to a third embodiment, Fig. 4 a bottom bracket gear according to the invention according to a fourth embodiment, Fig. 5 a switching matrix of the Fig. 1 to 4 shown bottom bracket gears.

[0060] The Fig. The bottom bracket transmission shown in Figure 1 comprises a first planetary gear set PS1, a second planetary gear set PS2, a third planetary gear set PS3, and a fourth planetary gear set PS4. The third planetary gear set PS3 and the fourth planetary gear set PS4 form a main gear set HR. The main gear set HR also comprises a first shaft 3, a second shaft 4, a third shaft 5, and a transmission output shaft 6.

[0061] In addition, the bottom bracket gear has nine shifting elements, namely a first shifting element Mz, a second shifting element Ms, a third shifting element A, a fourth shifting element E, a fifth shifting element Bz, a sixth shifting element Bs, a seventh shifting element D, an eighth shifting element Cz, and a ninth shifting element Cs. Furthermore, the bottom bracket gear has ten freewheels, namely a first freewheel F1, a second freewheel F2, a third freewheel F3, a fourth freewheel F4, a fifth freewheel F5, a sixth freewheel F6, a seventh freewheel F7, an eighth freewheel F8, a ninth freewheel F9, and a tenth freewheel F10. An input shaft 1 of the bottom bracket gear is connected in a rotationally fixed manner to a bottom bracket crankshaft 2. The bottom bracket crankshaft 2 has a pedal at each of its two ends.

[0062] In Fig. Figure 1 shows only the upper part of the bottom bracket gearing. The planetary gear sets PS1, PS2, PS3, and PS4 are arranged coaxially with the bottom bracket crankshaft 2.

[0063] A sun gear of the first planetary gear set PS1 is rotationally fixedly connected to a housing G. A carrier of the first planetary gear set PS1 is rotationally fixedly connected to the input shaft 1. A ring gear of the first planetary gear set PS1 is rotationally fixedly connected to the first shaft 3 by means of the first shifting element Mz and the first freewheel F1. The first shifting element Mz and the first freewheel F1 are components of a first power path between the ring gear of the first planetary gear set PS1 and the first shaft 3. Furthermore, the ring gear of the first planetary gear set PS1 is rotationally fixedly connected to the first shaft 3 by means of the second shifting element Ms and the second freewheel F2. The second shifting element and the second freewheel F2 are components of a second power path between the ring gear of the first planetary gear set PS1 and the third shaft 3.The first freewheel F1 and the second freewheel F2 differ from each other in that they lock in different directions of rotation, especially of the first shaft 3.

[0064] The first shifting element Mz and the first freewheel F1, and the second shifting element Ms and the second freewheel F2, are arranged such that the first power path and the second power path run parallel to each other, at least in sections, in particular between the ring gear and the first shaft 3. Furthermore, the ring gear of the first planetary gear set PS1 can be connected in a rotationally fixed manner to the second shaft 4 by means of the third shifting element A and the third freewheel F3.

[0065] A sun gear of the second planetary gear set PS2 is rotationally fixed to the housing G. A carrier of the second planetary gear set PS2 is rotationally fixed to the input shaft 1. The input shaft 1 extends through the second planetary gear set PS2 to be rotationally fixed to the carrier of the first planetary gear set PS1. A ring gear of the second planetary gear set PS2 is rotationally fixed to the third shaft 5 by means of the fourth shifting element E and the fourth freewheel F4.

[0066] Furthermore, the ring gear of the second planetary gear set PS2 is rotatably connected to the first shaft 3 by means of the fifth shifting element Bz and the fifth freewheel F5. The fifth shifting element Bz and the fifth freewheel F5 are part of a third power path between the ring gear of the second planetary gear set PS2 and the first shaft 3. Furthermore, the ring gear of the second planetary gear set PS2 is rotatably connected to the first shaft 3 by means of the sixth shifting element Bs and the sixth freewheel F6. The sixth shifting element Bs and the sixth freewheel F6 are part of a fourth power path between the ring gear of the second planetary gear set PS2 and the first shaft 3.The fifth switching element Bz and the fifth freewheel F5 and the sixth switching element Ms and the sixth freewheel F6 are arranged such that the third power path and the fourth power path run parallel to one another at least in sections, in particular between the ring gear and the first shaft 3.

[0067] The input shaft 1 is rotationally fixedly connected to the third shaft 5 by means of a seventh shifting element D and a seventh freewheel F7. Furthermore, the input shaft 1 is rotationally fixedly connected to the first shaft by means of an eighth shifting element Cz and an eighth freewheel F8. The eighth shifting element Cz and the eighth freewheel F8 are part of a fifth power path between the input shaft 1 and the first shaft 3. Furthermore, the input shaft 1 is rotationally fixedly connected to the first shaft 3 by means of a ninth shifting element Cs and a ninth freewheel F9. The ninth shifting element Cs and the ninth freewheel F9 are part of a sixth power path between the input shaft 1 and the first shaft 3.The eighth shifting element Cz and the eighth freewheel F8 and the ninth shifting element Cs and the ninth freewheel F9 are arranged such that the fifth power path and the sixth power path run parallel to one another at least in sections, in particular between the input shaft 1 and the first shaft 3.

[0068] The third planetary gear set PS3 and the fourth planetary gear set PS4 are arranged and operatively connected to one another in such a way that the main gear set is designed as a Simpson gear set. A sun gear of the third planetary gear set PS3 is rotationally fixed to the first shaft 3. A carrier of the third planetary gear set PS3 is rotationally fixed to the output shaft 6. A ring gear of the third planetary gear set PS3 is rotationally fixed to the second shaft 4. The second shaft 4 is rotationally fixed to the housing G by means of a tenth freewheel F10.

[0069] A sun gear of the fourth planetary gear set PS4 is rotationally fixed to the first shaft 3. The sun gear of the fourth planetary gear set PS4 is rotationally fixed to the sun gear of the third planetary gear set PS3 via the third shaft 3. A carrier of the fourth planetary gear set PS4 is rotationally fixed to the third shaft 5. A ring gear of the fourth planetary gear set PS4 is rotationally fixed to the output shaft 6. The ring gear of the fourth planetary gear set PS4 is rotationally fixed to the carrier of the third planetary gear set PS3 via the output shaft 6.

[0070] The stationary gear ratio of the first planetary gear set PS1 is -3, of the second planetary gear set PS2 is -1.5, of the third planetary gear set PS3 is -2 and of the fourth planetary gear set PS4 is -3.

[0071] Fig. Figure 2 shows a bottom bracket gear according to a second embodiment. The bottom bracket gear according to the second embodiment differs from that shown in Fig. 1 shows the bottom bracket gear according to the first embodiment in the configuration of the main gear set HR. Thus, the third planetary gear set PS3 and the fourth planetary gear set PS4 are arranged and operatively connected to one another in such a way that the main gear set is designed as a Ravigneaux gear set.

[0072] The sun gear of the third planetary gear set PS3 is non-rotatably connected to the second shaft 4, and the carrier of the third planetary gear set PS3 is non-rotatably connected to the third shaft 5. The ring gear of the third planetary gear set PS3 is non-rotatably connected to the output shaft 6.

[0073] The sun gear of the fourth planetary gear set PS4 is rotationally fixed to the first shaft 3, and the carrier of the fourth planetary gear set PS4 is rotationally fixed to the third shaft 5. Furthermore, the planets of the fourth planetary gear set PS4 mesh with the planets of the third planetary gear set PS3. The ring gear of the fourth planetary gear set PS4 is rotationally fixed to the transmission output shaft 6. The third planetary gear set PS3 and the fourth planetary gear set PS4 share a common ring gear.

[0074] The stationary gear ratio of the first planetary gear set PS1 is -3, of the second planetary gear set PS2 is -1.5, of the third planetary gear set PS3 is +3.1 and of the fourth planetary gear set PS4 is -2.9.

[0075] Fig. 3 shows a bottom bracket gear according to a third embodiment. The bottom bracket gear according to the third embodiment differs from that shown in Fig. 1 shows the bottom bracket gear according to the first embodiment in the configuration of the main gear set HR. Thus, the third planetary gear set PS3 and the fourth planetary gear set PS4 are arranged and operatively connected to one another in such a way that the main gear set is designed as a CR-CR gear set.

[0076] The sun gear of the third planetary gear set PS3 is non-rotatably connected to the second shaft 4, and the carrier of the third planetary gear set PS3 is non-rotatably connected to the transmission output shaft 6. The ring gear of the third planetary gear set PS3 is non-rotatably connected to the third shaft 5.

[0077] The sun gear of the fourth planetary gear set PS4 is rotationally fixed to the first shaft 3. The carrier of the fourth planetary gear set PS4 is rotationally fixed to the third shaft 5. The third shaft 5 extends through the fourth planetary gear set PS4 to connect to the ring gear of the third planetary gear set PS3. The ring gear of the fourth planetary gear set PS4 is rotationally fixed to the transmission output shaft 6. The ring gear of the fourth planetary gear set PS4 is rotationally fixed to the carrier of the third planetary gear set PS3 via the transmission output shaft 6.

[0078] The stationary gear ratio of the first planetary gear set PS1 is -3, of the second planetary gear set PS2 is -1.5, of the third planetary gear set PS3 is -2 and of the fourth planetary gear set PS4 is -3.

[0079] Fig. Figure 4 shows a bottom bracket gear according to a fourth embodiment. The bottom bracket gear according to the fourth embodiment differs from that shown in Fig. 1 shows the bottom bracket gear according to the first embodiment in the configuration of the main gear set HR. Thus, the third planetary gear set PS3 and the fourth planetary gear set PS4 are arranged and operatively connected to one another in such a way that the main gear set is designed as a CC-SR gear set.

[0080] The sun gear of the third planetary gear set PS3 is non-rotatably connected to the first shaft 3, and the carrier of the third planetary gear set PS3 is non-rotatably connected to the transmission output shaft 6. The ring gear of the third planetary gear set PS3 is non-rotatably connected to the second shaft 4.

[0081] The sun gear of the fourth planetary gear set PS4 is rotationally fixed to the second shaft 4, and the carrier of the fourth planetary gear set PS4 is rotationally fixed to the transmission output shaft 6. The sun gear of the fourth planetary gear set PS4 is rotationally fixed to the ring gear of the third planetary gear set PS3 via the second shaft 4. The ring gear of the fourth planetary gear set PS4 is rotationally fixed to the third shaft 5. The carrier of the fourth planetary gear set PS4 is rotationally fixed to the carrier of the third planetary gear set PS3 via the transmission output shaft 6.

[0082] The stationary gear ratio of the first planetary gear set PS1 is -3, of the second planetary gear set PS2 is -1.5, of the third planetary gear set PS3 is -2 and of the fourth planetary gear set PS4 is -2.

[0083] Fig. 5 shows a switching matrix relating to the Fig.1 to 4. As can be seen from the shift matrix, each of the bottom bracket gears has 15 gears, G1-G15.

[0084] The shift matrix shows the individual states of the nine shift elements and the operating status of the ten freewheels in the individual gears. Furthermore, the shift matrix contains the values ​​for the gear ratio "ratio" between input shaft 1 and transmission output shaft 6. Furthermore, the shift matrix contains values ​​for the gear steps "gear steps." The overall gear ratio "overall gear ratio" of the bottom bracket gears is 5.67.

[0085] The symbols used in the switching matrix for the nine switching elements and the nine freewheels F1 to F9 have the following meaning: • Switching element closed and freewheel locked, (•) Switching element closed and freewheel is in the overrunning drive, X Switching element open, freewheel without effect, % Switching element can be open or closed,

[0086] Overrunning of a freewheel means that the freewheel is not locking. The freewheel may be in overrunning mode if one of the components connected to the freewheel is rotating so fast that the freewheel cannot lock.

[0087] With regard to the tenth freewheel F10, the symbol • indicates that the freewheel is locked. The symbol (•) indicates that the freewheel is in overrunning gear and therefore does not lock.

[0088] In the following, a gear change from a first gear G1 to a second gear G2 for a bottom bracket transmission according to the first embodiment is described by way of example.

[0089] In first gear G1, the eighth shifting element Cz is closed and the eighth freewheel F8 is locked. This means that power can flow from input shaft 1 via the eighth shifting element Cz and the eighth freewheel F8 to the first shaft 3. The third shifting element A, seventh shifting element D, fourth shifting element E, first shifting element Mz and fifth shifting element Bz are open. In first gear, the ninth shifting element Cs, the second shifting element Ms and the sixth shifting element Bs can be closed or open without this having any influence on the functioning of the bottom bracket gear. In first gear G1, the bottom bracket gear is operated in such a way that the tenth freewheel F10 is locked. This means that the ring gear of the third planetary gear set PS3 cannot rotate in first gear.

[0090] When shifting from first gear G1 to second gear G2, only the first shifting element Mz is engaged. This creates a new power path, namely between the ring gear of the first planetary gear set PS1 and the first shaft 3. Power flows from the ring gear of the first planetary gear set PS1 via the first shifting element MZ and the first freewheel F1, which locks in second gear, to the first shaft 3.

[0091] The power path between input shaft 1 and first shaft 3 is interrupted. Specifically, first shaft 3 rotates faster in second gear G2 than in first gear G1, so the eighth freewheel F8 is in overrunning gear. This means that the eighth freewheel F8 does not lock, but rather freewheels, thus preventing power transmission between input shaft 1 and first shaft 3 via the eighth freewheel F8. The eighth shift element Cz remains closed in second gear B2.

[0092] In contrast to first gear G1, the ninth shift element Cs must be open in second gear G2. The remaining shift elements have the same state as in first gear G1. Reference symbol 1 input shaft 2 bottom bracket crankshaft 3 first wave 4 second wave 5 third wave 6 Gearbox output shaft Mz first switching element Ms second switching element A third switching element E fourth switching element Bz fifth switching element B's sixth switching element D seventh switching element Cz eighth switching element C's ninth switching element HR main gear set G Housing F1 first freewheel F2 second freewheel F3 third freewheel F4 fourth freewheel F5 fifth freewheel F6 sixth freewheel F7 seventh freewheel F8 eighth freewheel F9 ninth freewheel F10 tenth freewheel G1 first course G2 second gear G3 third gear G4 fourth gear G5 fifth gear G6 sixth gear G7 seventh gear G8 eighth gear G9 ninth gear G10 tenth gear G11 eleventh gear G12 twelfth gear G13 thirteenth gear G14 fourteenth gear G15 fifteenth gear PS1 first planetary gear set PS2 second planetary gear set PS3 third planetary gear set PS4 fourth planetary gear set

Claims

[1] Bottom bracket gear for a bicycle, characterized by an input shaft (1) which can be connected in a rotationally fixed manner to a bottom bracket crankshaft (2), a first planetary gear set (PS1) and a second planetary gear set (PS2), wherein the input shaft (1) is connected in a rotationally fixed manner to a gear set element of the first planetary gear set (PS1) and a gear set element of the second planetary gear set (PS2), and a main gear set (HR) comprising a third planetary gear set (PS3), a fourth planetary gear set (PS4) operatively connected to the third planetary gear set (PS3), a first shaft (3), a second shaft (4), a third shaft (5) and a transmission output shaft (6), wherein another gear set element of the first planetary gear set (PS1) is rotatably connected to the first shaft (3) by means of a first shifting element (Mz) and a first freewheel (F1) and is rotatably connected to the first shaft (3) by means of a second shifting element (Ms) and a second freewheel (F2) and is rotatably connected to the second shaft (4) by means of a third shifting element (A) and a third freewheel (F3) and another gear set element of the second planetary gear set (PS2), in particular by means of a fourth switching element (E) and a fourth freewheel (F4) is rotatably connected to the third shaft (5) and by means of a fifth switching element (Bz) and a fifth freewheel (F5) is rotatably connected to the first shaft (3) and by means of a sixth switching element (Bs) and a sixth freewheel (F6) is rotatably connected to the first shaft (3) and the input shaft (1) is rotatably connected to the third shaft (5) by means of a seventh shifting element (D) and a seventh freewheel (F7) and is rotatably connected to the first shaft (3) by means of an eighth shifting element (Cz) and an eighth freewheel (F8) and is rotatably connected to the first shaft (3) by means of a ninth shifting element (Cs) and a ninth freewheel (F9). [2] Bottom bracket gear according to claim 1, characterized by , that a. several gears can be shifted at least to the next gear without group switching and / or that b. the first planetary gear set (PS1) and / or the second planetary gear set (PS2) cause a gear ratio to increase. [3] Bottom bracket gear according to claim 1 or 2, characterized bythat the gear set element of the first planetary gear set (PS1) is a web and the other gear set element of the first planetary gear set (PS1) is a ring gear and a sun gear of the first planetary gear set (PS1) is connected in a rotationally fixed manner to a housing (G). [4] Bottom bracket gear according to claim 3, characterized by that the ring gear of the first planetary gear set (PS1) is optionally connected in a rotationally fixed manner to the first shaft (3) by means of the first switching element (Mz) and the first freewheel (F1) or to the first shaft (3) by means of the second switching element (Ms) and the second freewheel (F2) and / or that the ring gear of the first planetary gear set (PS1) is connected in a rotationally fixed manner to the second shaft (4) by means of the third switching element (A) and the third freewheel (F3). [5] Bottom bracket gear according to one of claims 1 to 4, characterized bythat the gear set element of the second planetary gear set (PS2) is a web and the other gear set element of the second planetary gear set (PS2) is a ring gear and a sun gear of the second planetary gear set (PS2) is connected in a rotationally fixed manner to a housing (G). [6] Bottom bracket gear according to claim 5, characterized by that the ring gear of the second planetary gear set (PS2) is connected in a rotationally fixed manner to the third shaft (5) by means of the fourth switching element (E) and the fourth freewheel (F4) and / or that the ring gear of the second planetary gear set (PS2) is connected in a rotationally fixed manner to the first shaft (3) either by means of the fifth switching element (Bz) and the fifth freewheel (F5) or by means of the sixth switching element (Bs) and the sixth freewheel (F6). [7] Bottom bracket gear according to one of claims 1 to 6, characterized bythat the input shaft (1) is connected in a rotationally fixed manner to the third shaft (5) by means of the seventh switching element (D) and the seventh freewheel (F7) and / or that the input shaft (1) is optionally connected in a rotationally fixed manner to the first shaft (3) by means of the eighth switching element (Cz) and the eighth freewheel (F8) or by means of the ninth switching element (Cs) and the ninth freewheel (F9) to the first shaft (3). [8] Bottom bracket gear according to one of claims 1 to 7, characterized by that the second shaft (4) can be connected in a rotationally fixed manner to a housing (G) by means of a tenth freewheel (F10). [9] Bottom bracket gear according to one of claims 1 to 8, characterized by , that a. a sun gear of the third planetary gear set (PS3) is connected in a rotationally fixed manner to the first shaft (3) and a carrier of the third planetary gear set (PS3) is connected in a rotationally fixed manner to the transmission output shaft (6) and a ring gear of the third planetary gear set (PS3) is connected in a rotationally fixed manner to the second shaft (4) and a sun gear of the fourth planetary gear set (PS4) is connected in a rotationally fixed manner to the first shaft (3) and a carrier of the fourth planetary gear set (PS4) is connected in a rotationally fixed manner to the third shaft (5) and a ring gear of the fourth planetary gear set (PS4) is connected in a rotationally fixed manner to the transmission output shaft (6) or that b. a sun gear of the third planetary gear set (PS3) is connected in a rotationally fixed manner to the second shaft (4) and a carrier of the third planetary gear set (PS3) is connected in a rotationally fixed manner to the third shaft (5) and a ring gear of the third planetary gear set (PS1) is connected in a rotationally fixed manner to the transmission output shaft (6) and a sun gear of the fourth planetary gear set (PS4) is connected in a rotationally fixed manner to the first shaft (3) and a carrier of the fourth planetary gear set (PS4) is connected in a rotationally fixed manner to the third shaft (5) and a ring gear of the fourth planetary gear set (PS4) is connected in a rotationally fixed manner to the transmission output shaft (6) or that c. the sun gear of the third planetary gear set (PS3) is connected in a rotationally fixed manner to the second shaft (4) and the carrier of the third planetary gear set (PS3) is connected in a rotationally fixed manner to the transmission output shaft (6) and the ring gear of the third planetary gear set (PS3) is connected in a rotationally fixed manner to the third shaft (5) and the sun gear of the fourth planetary gear set (PS4) is connected in a rotationally fixed manner to the first shaft (3) and the carrier of the fourth planetary gear set (PS4) is connected in a rotationally fixed manner to the third shaft (5) and the ring gear of the fourth planetary gear set (PS4) is connected in a rotationally fixed manner to the transmission output shaft (6) or that d. the sun gear of the third planetary gear set (PS3) is connected in a rotationally fixed manner to the first shaft (3) and the carrier of the third planetary gear set (PS3) is connected in a rotationally fixed manner to the transmission output shaft (6) and the ring gear of the third planetary gear set (PS3) is connected in a rotationally fixed manner to the second shaft (4) and the sun gear of the fourth planetary gear set (PS4) is connected in a rotationally fixed manner to the second shaft (4) and the carrier of the fourth planetary gear set (PS4) is connected in a rotationally fixed manner to the transmission output shaft (6) and the ring gear of the fourth planetary gear set (PS4) is connected in a rotationally fixed manner to the third shaft (5). [10] Bottom bracket gear according to one of claims 1 to 9, characterized by , that a. the first planetary gear set (PS1) has at least one stepped planet and / or that b. the second planetary gear set (PS2) has at least one stepped planet. [11] Bottom bracket gear according to one of claims 1 to 10, characterized by , that a. the bottom bracket gear has an electric machine which is operatively connected to the gear output shaft (6) or the input shaft (1) or that b. the bottom bracket transmission comprises an electric machine which is operatively connected to the transmission output shaft (6) and another electric machine which is operatively connected to the input shaft (1). [12] Bottom bracket gear according to one of claims 1 to 11, characterized by , that a. the bottom bracket gear has nine shifting elements and ten freewheels to achieve 15 gears and / or that b. the bottom bracket gear provides at least 11 gears, in particular exactly 11, preferably 15 gears, wherein each of the gears can be shifted at least into the next gear without group shifting. [13] Bottom bracket gear according to one of claims 1 to 12, characterized by that optionally a. a first gear (G1) can be realized in which the eighth shift element (Cz) is closed and the tenth freewheel (F10) is locked, wherein the third shift element (A), the seventh shift element (D), the fourth shift element (E), the first shift element (Mz) and the fifth shift element (Bz) are open and the ninth shift element (Cs), the second shift element (Ms) and the sixth shift element (Bs) are open or closed or b. a second gear (G2) is realizable, in which the first shifting element (Mz) is closed and the tenth freewheel (F10) is locked, wherein the third shifting element (A), the seventh shifting element (D), the fourth shifting element (E), the ninth shifting element (Cs) and the fifth shifting element (Bz) are open and the second shifting element (Ms) and the sixth shifting element (Bs) are open or closed and the eighth shifting element (Cz) is closed, wherein the eighth freewheel (F8) is free-running, or c. a third gear (G3) is realizable, in which the fifth shifting element (Bz) is closed and the tenth freewheel (F10) is locked, wherein the third shifting element (A), the seventh shifting element (D), the fourth shifting element (E), the ninth shifting element (Cs) and the second shifting element (Ms) are open and the eighth shifting element (Cz) and the sixth shifting element (Bs) are open or closed and the first shifting element (Mz) is closed, wherein the first freewheel (F1) is free-running, or d. a fourth gear (G4) is realizable, in which the seventh shift element (D) is closed and the tenth freewheel (F10) is locked, wherein the third shift element (A), the fourth shift element (E), the ninth shift element (Cs), the second shift element (Ms) and the sixth shift element (Bs) are open and the eighth shift element (Cz) and the first shift element (Mz) are closed or open and the fifth shift element (Bz) is closed, wherein the fifth freewheel (F5) is free-running, or e. a fifth gear (G5) is realizable, in which the seventh shift element (D) and the sixth shift element (Bs) are closed, the third shift element (A), the fourth shift element (E), the second shift element (Ms) and the ninth shift element (Cs) are open and the eighth shift element (Cz), the first shift element (Mz) and the fifth shift element (Bz) are open or closed and the tenth freewheel (F10) is free-running, or f. a sixth gear (G6) is realizable, in which the seventh shift element (D) and the second shift element (Ms) are closed, the third shift element (A), the fourth shift element (E), the ninth shift element (Cs) and the fifth shift element (Bz) are open, and the eighth shift element (Cz) and the first shift element (Mz) are closed or open, and the tenth freewheel (F10) is freewheeling and the sixth shift element (Bs) is closed, the sixth freewheel (F6) being freewheeling, or g. a seventh gear (G7) is realizable, in which the seventh shift element (D) and the ninth shift element (Cs) are closed, the third shift element (A), the fourth shift element (E), the first shift element (Mz) and the fifth shift element (Bz) are open, and the eighth shift element (Cz) and the sixth shift element (Bs) are closed or open, and the tenth freewheel (F10) is freewheeling and the second shift element (Ms) is closed, the second freewheel (F2) being freewheeling, or h. an eighth gear (G8) can be realized in which the third switching element (A) and the seventh switching element (D) are closed, the fourth switching element (E), the eighth switching element (Cz), the first switching element (Mz) and the fifth switching element (Bz) are open and the second switching element (Ms) and the sixth switching element (Bs) are closed or open and the tenth freewheel (F10) is freewheeling and the ninth switching element (Cs) is closed, the ninth freewheel (F9) being freewheeling, or i. a ninth gear (G9) is realizable, in which the third shift element (A) and the eighth shift element (Cz) are closed, the fourth shift element (E), the first shift element (Mz) and the fifth shift element (Bz) are open, and the ninth shift element (Cs), the second shift element (Ms) and the sixth shift element (Bs) are closed or open, and the tenth freewheel (F10) is freewheeling and the seventh shift element (D) is closed, the seventh freewheel (F7) being freewheeling, or j. a tenth gear (G10) is realizable, in which the third shift element (A) and the first shift element (Mz) are closed, the fourth shift element (E), the ninth shift element (Cs) and the fifth shift element (Bz) are open, and the second shift element (Ms), the sixth shift element (Bs) and the seventh shift element (D) are closed or open, and the tenth freewheel (F10) is freewheeling and the eighth shift element (Cz) is closed, the eighth freewheel (F8) being freewheeling, or k. an eleventh gear (G11) is realizable, in which the third shift element (A) and the fifth shift element (Bz) are closed, the fourth shift element (E), the ninth shift element (Cs) and the second shift element (Ms) are open, and the seventh shift element (D), the eighth shift element (Cz) and the sixth shift element (Bs) are closed or open, and the tenth freewheel (F10) is freewheeling and the first shift element (Mz) is closed, the first freewheel (F1) is freewheeling, or l. a twelfth gear (G12) is realizable, in which the third shift element (A) and the fourth shift element (E) are closed, the ninth shift element (Cs), the second shift element (Ms) and the sixth shift element (Bs) are open, and the seventh shift element (D), the eighth shift element (Cz) and the first shift element (Mz) are closed or open, and the tenth freewheel (F10) is freewheeling and the fifth shift element (Bz) is closed, the fifth freewheel (F5) is freewheeling, or m. a thirteenth gear (G13) is realizable, in which the fourth shift element (E) and the sixth shift element (Bs) are closed, the ninth shift element (Cs) and the second shift element (Ms) are open, and the seventh shift element (D) and the eighth shift element (Cz), the first shift element (Mz) and the fifth shift element (Bz) are closed or open, the tenth freewheel (F10) is freewheeling, and the third shift element (A) is closed, the third freewheel (F3) is freewheeling, or n. a fourteenth gear (G14) is realizable, in which the fourth shift element (E) and the second shift element (Ms) are closed, the ninth shift element (Cs) and the fifth shift element (Bz) are open, and the seventh shift element (D) and the third shift element (A) and the eighth shift element (Cz) and the first shift element (Mz) are closed or open, and the tenth freewheel (F10) is freewheeling and the sixth shift element (Bs) is closed, the sixth freewheel (F6) is freewheeling, or o. a fifteenth gear (G15) can be realized in which the fourth shift element (E) and the ninth shift element (Cs) are closed and the first shift element (Mz) and the fifth shift element (Bz) are open and the third shift element (A) and the seventh shift element (D) and the eighth shift element (Cz) and the sixth shift element (Bs) are open or closed and the tenth freewheel (F10) is freewheeling and the second shift element (Ms) is closed, wherein the second freewheel (F2) is freewheeling. [14] Bottom bracket with a bottom bracket gear according to claims 1 to 13 and the bottom bracket crankshaft (2), characterized by that the input shaft (1) is connected to the bottom bracket crankshaft (2) in a rotationally fixed manner. [15] Bicycle with a bottom bracket gear according to claims 1 to 13 or a bottom bracket according to claim 14.

Images