DE102022203246B3 - Planetary bottom bracket gear for a bicycle or pedelec - Google Patents

Abstract

A bottom bracket gear in planetary design for a bicycle or a pedelec (1), with a pedal crankshaft (Wan) as the drive and a gear output shaft (Wab) as the output, as well as at least five other shafts (W1, W2, W3, W4, W5), with three planetary gear sets (RS1, RS2, RS3), which are arranged coaxially to the crankshaft (Wan), and with six shifting elements (B1, B2, B3, F1, F2, F3) for realizing at least six gears (V1, V2, V3. 1, V3.2 V4, V5, V6.1, V6.2) proposed, wherein the crankshaft (Wan) is connected to a second element of the first planetary gear set (RS1), wherein the crankshaft (Wan) via a fourth shifting element (F1 ) and a third shaft (W3) can be connected to a first element of the second planetary gear set (RS2) and can be connected via a sixth switching element (F3) and via a second shaft (W2) to a first element of the third planetary gear set (RS3), wherein the transmission output shaft (Wab) is connected to a first element of the first planetary gear set (RS1), the transmission output shaft (Wab) being connectable to a third element of the third planetary gear set (RS3) via a fifth shifting element (F2) and via a first shaft (W1). is, wherein a third element of the first planetary gear set (RS1) is connected via a fourth shaft (W4) to a second element of the second planetary gear set (RS2), and wherein a third element of the second planetary gear set (RS2) via a fifth shaft (W5) is connected to a second element of the third planetary gear set (RS3).

Description

The present invention relates to a bottom bracket gear in planetary design for a bicycle or a pedelec with a pedal crankshaft as the drive and a gear output shaft as the output and at least five other shafts, with at least three planetary gear sets, which are arranged coaxially to the pedal crankshaft and with at least six shifting elements for realizing at least six courses. Furthermore, the invention relates to a bicycle or pedelec with the bottom bracket gear.

For example from the publication DE 10 2016 225 169 A1 a planetary transmission for a bicycle or pedelec is known. For the realization of only four gears, the transmission comprises at least two planetary gear sets, of which at least one planetary gear set is necessarily designed as a plus planetary gear set that requires a lot of installation space. Furthermore, at least four switching elements are required. In a further embodiment variant of the transmission, four further gears are realized by adding two further shifting elements and a further planetary gear set. Due to the intended interconnection or connection of the various planetary gear sets, the known transmission results in a configuration that requires a lot of installation space.

DE 10 2017 218 448 A1 , DE 10 2020 210 928 A1 , DE 10 2018 208 380 A1 , DE 10 2019 220 044 A1 and DE 10 2021 204 634 B3 (post-published) each show planetary gears for bicycles.

Accordingly, the present invention is based on the object of realizing a bottom bracket gear of the type described at the outset with as little construction effort as possible and with as few components as possible.

According to the invention, this object is achieved by the objects having the features of patent claim 1 and 15, respectively. Advantageous and claimed developments result from the dependent claims and the description as well as the drawings.

Thus, a bottom bracket gear in a planetary design is proposed for a bicycle or a pedelec. The bottom bracket gear has a pedal crankshaft as the drive and a gear output shaft as the output and at least five other shafts, with the output preferably taking place via a chain wheel, a belt wheel or the like. Furthermore, the bottom bracket transmission comprises three planetary gear sets, which are arranged coaxially to the pedal crankshaft, and six shifting elements for realizing at least six gears in the proposed bottom bracket transmission. In order to provide a particularly effective and space-saving design for the bottom bracket gear, the pedal crankshaft is connected to a second element of the first planetary gear set. Furthermore, the pedal crankshaft Wan can be connected to a first element of the second planetary gearset via a fourth shifting element and a third shaft. In addition, the first element of the second planetary gearset can be connected to a first element of the third planetary gearset via a sixth shifting element and via a second shaft. The transmission output shaft is connected to a first member of the first planetary gear set. Furthermore, the transmission output shaft can be connected to a third element of the third planetary gear set via a fifth shifting element and via a first shaft. A third member of the first planetary gear set is connected to a second member of the second planetary gear set via a fourth shaft. In addition, a third element of the second planetary gear set is connected to a second element of the third planetary gear set via a fifth shaft.

In this way, with the above-described connection of only three provided planetary gear sets and only six provided shifting elements, a particularly simple and compact structure is realized in the proposed bottom bracket gear. In addition, there is a particularly low component load and an advantageously high gearing efficiency due to the geometric gear ratio series in the bottom bracket gear.

For the mechanical connection of elements of the planetary gear sets, only five other shafts or shaft-like elements are preferably used in addition to the input and output, whereby the term shaft does not exclusively mean a cylindrical, rotatably mounted machine element for the transmission of torque, but rather also includes general connecting elements to understand that connect the individual wheel set elements together for torque transmission.

In order to realize the space-saving arrangement in the proposed bottom bracket gear, it is provided that when the first shifting element is closed, the first shaft connected to the third element of the third planetary gear set is firmly connected to a housing, that when the second shifting element is closed, the shaft connected to the first element of the third planetary gear set connected second shaft is fixed to the housing, and that when the third switching element is closed, the third shaft connected to the first element of the second planetary gear set is fixed to the housing. Furthermore, at closed or locked fourth shifting element, the pedal crankshaft is connected to the third shaft and if the fifth shifting element is closed or locked, the transmission output shaft is connected to the first shaft and if the sixth shifting element is closed or locked, the second shaft is connected to the third shaft. Due to the above-described connection of the elements on the housing side and the connection of the elements to one another by the switching elements provided as brakes and freewheels, the intended gears can be implemented with a very compact design of the bottom bracket gear.

In the context of the present invention, it is provided in the proposed bottom bracket gear that the first shifting element, the second shifting element and the third shifting element are each designed as a positive-locking brake and/or that the fourth shifting element, the fifth shifting element and the sixth shifting element are each designed as a freewheel .

The shifting elements designed as brakes are preferably designed as positive-locking shifting elements, for example as inexpensive shifting claws or the like, for example with a toothed brake ring and a corresponding shifting pawl. Brakes as switching elements have the advantage that they can be easily reached from the outside for actuation. Since the provided freewheels are used as clutches, it is advantageous if the brakes are designed as single-acting brakes, for example, in order to prevent the transmission from locking when the direction of rotation is reversed at the input or output.

Non-switchable freewheels are preferably used as freewheels. This has the advantage that no switching operation is required for the passive switching elements. The non-switchable freewheel transmits torque when locked. No torque is transmitted in the opposite direction of rotation. However, it is conceivable that switchable freewheels or also switchable freewheel brakes are used.

A preferred embodiment of the invention can provide that at least one of the provided planetary gear sets is designed as a negative planetary gear set, resulting in a particularly space-saving arrangement. It is also conceivable that one of the planetary gear sets is designed as a plus planetary gear set.

A minus planetary gear set can preferably be converted into a plus planetary gear set if the planetary gear carrier and ring gear connection on this gear set is swapped with one another and the amount of the stationary gear ratio is increased by 1. A negative planetary gear set has planetary gears mounted on its planetary gear carrier that can rotate, which mesh with the sun gear and the ring gear of this planetary gear set, so that the ring gear rotates in the opposite direction to the direction of rotation of the sun gear when the planetary gear carrier is fixed and the sun gear is rotating. A plus planetary gear set has inner and outer planetary gears rotatably mounted on its planetary gear carrier and meshing with one another, the sun gear of this planetary gear set meshing with the inner planetary gears and the ring gear of this planetary gear set with the outer planetary gears, so that the ring gear can be rotated when the planet carrier is stationary and rotating Sun gear rotates in the same direction of rotation as the sun gear.

For the person skilled in the art, this means that in the case of the single gear sets designed as a minus planetary gear set, a first element is designed as a sun gear, a second element as a planetary gear carrier or carrier and a third element as a ring gear. Furthermore, this means that in a single gear set designed as a plus planetary gear set, the first element is designed as a sun gear, the second element as a ring gear and the third element as a planetary gear carrier or spider.

In order to further optimize the control of the proposed bottom bracket gear, it is provided that at least one torque sensor or the like is provided on the input and/or on the output.

In order to electrically support the drive in the proposed bottom bracket gearbox, at least one electric machine or the like can be connected or connectable to the drive or to the pedal crankshaft and/or to the output or to the gearbox output shaft, or be coupled in a fixed or detachable manner. The electric machine can preferably be arranged axially parallel to the pedal crankshaft.

A further aspect of the present invention claims a bicycle or pedelec with the above-described bottom bracket gear. This results in the advantages already described and other advantages.

The present invention is explained in more detail below with reference to the drawings.

• 1 eine schematische Prinzipansicht einer möglichen Ausführungsvariante eines Tretlagergetriebes in Planetenbauweise für ein Fahrrad oder Pedelec mit beispielhaft drei Minus-Planetenradsätzen;
• 2 eine schematische Prinzipansicht des Tretlagergetriebes gemäß 1 mit einem beispielhaft als ersten Planetenradsatz ausgeführten Plus-Planetenradsatz;
• 3 eine schematische Prinzipansicht des Tretlagergetriebes gemäß 1 mit einem beispielhaft als zweiten Planetenradsatz ausgeführten Plus-Planetenradsatz;
• 4 eine schematische Prinzipansicht des Tretlagergetriebes gemäß 1 mit einem beispielhaft als dritten Planetenradsatz ausgeführten Plus-Planetenradsatz,
• 5 eine schematische Ansicht des Tretlagergetriebes gemäß 1 mit einem beispielhaft angedeuteten Drehmomentsensor am Antrieb;
• 6 eine schematische Ansicht des Tretlagergetriebes gemäß 1 mit einer beispielhaft am Antrieb angeordneten elektrischen Maschine;
• 7 eine schematische Ansicht des Tretlagergetriebes gemäß 1 mit einer beispielhaft am Abtrieb angeordneten elektrischen Maschine; und
• 8 ein Schaltschema mit den schaltbaren Gängen bei dem erfindungsgemäßen Tretlagergetriebe gemäß 1 bis 7.

Show it:

• 1 a schematic principle view of a possible embodiment variant of a Tretla planetary gear for a bicycle or pedelec with, for example, three minus planetary gear sets;
• 2 a schematic schematic view of the bottom bracket gear according to 1 with a plus planetary gear set designed as an example as the first planetary gear set;
• 3 a schematic schematic view of the bottom bracket gear according to 1 with a plus planetary gear set designed as an example as a second planetary gear set;
• 4 a schematic schematic view of the bottom bracket gear according to 1 with a plus planetary gear set designed as an example as a third planetary gear set,
• 5 a schematic view of the bottom bracket gear according to 1 with a torque sensor indicated as an example on the drive;
• 6 a schematic view of the bottom bracket gear according to 1 with an electric machine arranged, for example, on the drive;
• 7 a schematic view of the bottom bracket gear according to 1 with an example arranged at the output electrical machine; and
• 8th according to a shift pattern with the shiftable gears in the bottom bracket gear according to the invention 1 until 7 .

In the 1 until 7 Various embodiments are shown purely as examples based on schematic basic views of a bottom bracket gear according to the invention in a planetary design for a bicycle or a pedelec 1 . 1 shows the schematically indicated bicycle or pedelec 1 with the bottom bracket gear.

Irrespective of the versions, the bottom bracket transmission comprises a crankshaft or pedal crank Wan in a housing or bottom bracket housing 2 as a drive with the pedals and a transmission output shaft Wab as an output with a sprocket or belt wheel not shown in more detail. Furthermore, five further shafts W1, W2, W3, W4, W5 are provided, which are coupled or connected to elements of the three planetary gear sets RS1, RS2, RS3. The elements of the first planetary gear set RS1 and the second planetary gear set RS2 as well as the third planetary gear set RS3 are arranged coaxially to the pedal crankshaft Wan. In addition, six shifting elements B1, B2, B3, F1, F2, F3 are provided for realizing six gears V1, V2, V3.1, V3.2, V4, V5, V6.1, V6.2. The first switching element B1 and the second switching element B2 and the third switching element B3 are each designed as switchable brakes, while the fourth switching element F1, the fifth switching element F2 and the sixth switching element F3 are each designed as non-switchable freewheels.

Furthermore, regardless of what has been said about the proposed bottom bracket gear, it is provided that the pedal crankshaft Wan is connected to a second element of the first planetary gear set RS1. In addition, the pedal crankshaft Wan can be connected to a first element of the second planetary gearset RS2 via a fourth shifting element F1 and a third shaft W3. Furthermore, the first element of the second planetary gearset can be connected to a first element of the third planetary gearset (RS3) via a sixth shifting element and via a second shaft. The transmission output shaft Wab is connected to a first element of the first planetary gear set RS1. Furthermore, the transmission output shaft Wab can be connected to a third element of the third planetary gearset RS3 via a fifth shifting element F2 and via a first shaft W1. A third element of the first planetary gear set RS1 is connected to a second element of the second planetary gear set RS2 via a fourth shaft W4, while a third element of the second planetary gear set RS2 is connected to a second element of the third planetary gear set RS3 via a fifth shaft W5.

With the above-described connection of the elements of the planetary gear sets RS1, RS2, RS3 and the shafts Wan, Wab, W1, W2, W3, W4, W5 as well as the shifting elements B1, B2, B3, F1, F2, F3, the result is a particularly compact design of the bottom bracket gearbox.

In the 1 and 5 until 7 the three planned planetary gear sets RS1, RS2, RS3 are each designed as space-saving minus planetary gear sets. It is provided that a sun gear SR1, SR2, SR3 is provided as the first element, a planet carrier PT1, PT2, PT3 as the second element and a ring gear HR1, HR2, HR3 as the third element in the planetary gear sets RS1, RS2, RS3.

In detail, this means that the pedal crankshaft Wan is connected to the planet carrier PT1 of the first planetary gear set RS1. Furthermore, the pedal crankshaft Wan can be connected to the sun gear SR2 of the second planetary gearset RS2 via the fourth shifting element F1 and the third shaft W3. In addition, the sun gear SR2 of the second planetary gear set RS2 can be connected to the sun gear SR3 of the third planetary gear set RS3 via the sixth shifting element F3 and via the second shaft W2. The transmission output shaft Wab is connected to the sun gear SR1 of the first planetary gear set RS1. Furthermore, the transmission output shaft Wab via the fifth shifting element F2 and can be connected via the first shaft W1 to the ring gear HR3 of the third planetary gear set RS3. The ring gear HR1 of the first planetary gearset RS1 is connected to the planetary gear carrier PT2 of the second planetary gearset RS2 via the fourth shaft W4. The ring gear HR2 of the second planetary gearset RS2 is connected to the planetary gear carrier PT3 of the third planetary gearset RS3 via the fifth shaft W5. When the first switching element B1 is closed, the first shaft W1, which is connected to the ring gear HR3 of the third planetary gear set RS3, is firmly connected to a housing 2. When the second switching element B2 is closed, the second shaft W2, which is connected to the sun gear SR3 of the third planetary gear set RS3, is firmly connected to the housing 2. When the third switching element B3 is closed, the third shaft W3, which is connected to the sun gear SR2 of the second planetary gear set RS2, is firmly connected to the housing 2. When the fourth switching element F1 is closed or blocked, the pedal crankshaft Wan is connected to the third shaft W3. When the fifth shifting element F2 is engaged or locked, the transmission output shaft Wab is connected to the first shaft W1, and when the sixth shifting element F3 is engaged or locked, the second shaft W2 is connected to the third shaft W3.

In the 2 until 4 a positive planetary gear set is always provided for the three planned planetary gear sets RS1, RS2, RS3, with the positive planetary gear set resulting in an interchange of the ring gear connection and the planetary gear carrier connection.

In 2 For example, the first planetary gear set RS1 is designed as a plus planetary gear set, while the second planetary gear set RS2 and the third planetary gear set RS3 are each designed as a minus planetary gear set. In 3 For example, the second planetary gear set RS2 is designed as a plus planetary gear set, while the first planetary gear set RS1 and the third planetary gear set RS3 are each designed as a minus planetary gear set. In 4 For example, the third planetary gear set RS3 is designed as a plus planetary gear set, while the first planetary gear set RS1 and the second planetary gear set RS2 are each designed as a minus planetary gear set. When using a plus planetary gear set, there is greater flexibility in the selection of the translations.

In 5 an embodiment of the bottom bracket transmission according to the invention is shown, in which a torque sensor 3 is connected or can be connected to the pedal crankshaft Wan. For example, a disk-shaped torque sensor 3 can be arranged at the transmission input. However, the torque sensor 3 can also be implemented in other ways.

In the 6 and 7 an embodiment of the bottom bracket gear according to the invention with an additional electric machine EM is shown in each case. The electrical machine EM can be connected to the Wan pedal crankshaft, as shown in 6 is indicated. It is also conceivable that the electrical machine EM is connected to the transmission output shaft Wab, as is shown in 7 is shown. The electric machine EM is preferably arranged axially parallel to the pedal crankshaft Wan. However, a coaxial arrangement of the electrical machine EM to the pedal crankshaft Wan would also be possible. Irrespective of this, it is advantageous to connect the electrical machine EM via a freewheel or the like, so that no losses are caused by the rotating electrical machine EM during operation without the electrical machine EM.

In 8th is an example of a circuit diagram for in the 1 until 7 shown embodiments of the bottom bracket gear according to the invention. The shifting elements B1, B2, B3, F1, F2, F3 used for the respective gear V1, V2, V3.1, V3.2, V4, V5, V6.1, V6.2 are specified in the shifting diagram. An X in the case of a freewheel F1, F2, F3 as a switching element in the shift pattern means that the freewheel is blocked. This works automatically without external action. Furthermore, an X in the case of a brake B1, B2, B3 as a switching element in the shift pattern means that the brake B1, B2, B3 is closed. This works via suitable actuators.

In detail results from the circuit diagram according to 8th that to realize a first gear V1 the fourth shifting element F1 designed as a freewheel and the fifth shifting element F2 designed as a freewheel as well as the sixth shifting element F3 designed as a freewheel are blocked, that to realize a second gear V2 the second shifting element B2 designed as a brake is closed and the fourth shifting element F1 designed as a freewheel and the fifth shifting element F2 designed as a freewheel are locked, that to realize a third gear V3.1 the second shifting element B2 designed as a brake and the third shifting element B3 designed as a brake are closed and the fifth as a freewheel executed shifting element F2 is locked, that to realize a fourth gear V4 the first shifting element B1 designed as a brake is closed and the fourth shifting element F1 designed as freewheel and the sixth shifting element F3 designed as freewheel are locked, that to realize a fifth gear V5 the first Shifting element B1 designed as a brake and the second shifting element B2 designed as a brake are closed and the fourth shifting element F1 designed as a freewheel is locked, and/or that for the realization When a sixth gear V6.1 is reached, the first shifting element B1 designed as a brake and the second shifting element B2 designed as a brake and the third shifting element B3 designed as a brake are closed. This means that three shifting elements must be used simultaneously to shift each gear.

It is also provided that, in order to implement an alternative third gear V3.2, the third shifting element B3 designed as a brake is closed and the fifth shifting element F2 designed as a freewheel and the sixth shifting element F3 designed as a freewheel are locked.

In addition, in order to implement an alternative sixth gear V6.2, the first shifting element B1 designed as a brake and the third shifting element B3 designed as a brake are closed and the sixth shifting element F3 designed as a freewheel is locked.

Reference List

1

bicycle or a pedelec

2

Housing or bottom bracket housing

3

torque sensor

SR1

Sun gear of the first planetary gear set

PT1

Planet carrier of the first planetary gear set

HR1

Ring gear of the first planetary gear set

SR2

Sun gear of the second planetary gear set

PT2

Planet carrier of the second planetary gear set

HR2

Ring gear of the second planetary gear set

SR3

Sun gear of the third planetary gear set

PT3

Planet carrier of the third planetary gear set

HR3

Ring gear of the third planetary gear set

when

pedal crankshaft

honeycomb

transmission output shaft

EM

electric machine

w1

first wave

W2

second wave

W3

third wave

W4

fourth wave

W5

fifth wave

RS1

first planetary gear set

RS2

second planetary gear set

RS3

third planetary gear set

B1

first switching element as a brake

B2

second switching element as a brake

B3

third switching element as a brake

F1

fourth switching element as a freewheel

F2

fifth switching element as a freewheel

F3

sixth switching element as a freewheel

V1

first course

v2

second gear

V3.1

third gear

V3.2

alternative third course

V4

fourth gear

V5

fifth gear

V6.1

sixth gear

V6.2

alternative sixth gear

Claims (15)

Planetary bottom bracket gear for a bicycle or a pedelec (1), with a crankshaft (Wan) as the drive and a gear output shaft (Wab) as the output and at least five other shafts (W1, W2, W3, W4, W5), with three planetary gear sets ( RS1, RS2, RS3), which are arranged coaxially to the pedal crankshaft (Wan), and with six shifting elements (B1, B2, B3, F1, F2, F3) for realizing at least six gears (V1, V2, V3.1, V3 .2 V4, V5, V6.1, V6.2), wherein the crankshaft (Wan) is connected to a second element of the first planetary gear set (RS1), wherein the crankshaft (Wan) has a fourth switching element (F1) and a third Shaft (W3) can be connected to a first element of the second planetary gear set (RS2), the first element of the second planetary gear set (RS2) being connected via a sixth switching element (F3) and a second shaft (W2) to a first element of the third planetary gear set ( RS3) can be connected, the transmission output shaft (Wab) being connected to a first element of the first planetary gear set (RS1), the transmission output shaft (Wab) being connected via a fifth shifting element (F2) and via a first shaft (W1) to a third element of the third planetary gear set (RS3) can be connected, with a third element of the first planetary gear set (RS1) being connected via a fourth shaft (W4) to a second element of the second planetary gear set (RS2), and with a third element of the second planetary gear set (RS2) being connected via a fifth wave (W5) is connected to a second element of the third planetary gear set (RS3). bottom bracket gear claim 1 , characterized in that when the first switching element (B1) is closed, the first shaft (W1) connected to the third element of the third planetary gear set (RS3) is firmly connected to a housing (2), that when the second switching element (B2) is closed, the shaft connected to the second shaft (W2) connected to the first element of the third planetary gear set (RS3) is firmly connected to the housing (2), and that when the third switching element (B3) is closed, the third shaft (W3) connected to the first element of the second planetary gear set (RS2) is firmly connected to the housing (2). bottom bracket gear claim 1 or 2 , characterized in that when the fourth switching element (F1) is closed or locked, the pedal crankshaft (Wan) is connected to the third shaft (W3), that when the fifth switching element (F2) is closed or locked, the transmission output shaft (Wab) is connected to the first shaft (W1 ) is connected, and that when the sixth switching element (F3) is closed or locked, the second shaft (W2) is connected to the third shaft (W3). Bottom bracket gear according to one of the preceding claims, characterized in that the first shifting element (B1), the second shifting element (B2) and the third shifting element (B3) are each designed as a positive-locking brake and/or that the fourth shifting element (F1), the fifth Switching element (F2) and the sixth switching element (F3) are each designed as a freewheel. Bottom bracket gear according to one of the preceding claims, characterized in that a torque sensor (3) is connected to the pedal crankshaft (Wan). Bottom bracket transmission according to one of the preceding claims, characterized in that at least one electrical machine (EM) is connected or can be connected to the pedal crankshaft (Wan) or to the transmission output shaft (Wab). bottom bracket gear claim 6 , characterized in that the electric machine (EM) is arranged axially parallel to the pedal crankshaft (Wan). Bottom bracket gear according to one of the preceding claims, characterized in that at least one of the planetary gear sets (RS1, RS2, RS3) is designed as a minus planetary gear set. bottom bracket gear claim 8 , characterized in that in a minus planetary gear set, the first element is designed as a sun gear (SR1, SR2, SR3), the second element as a planet gear carrier (PT1, PT2, PT3) and the third element as a ring gear (HR1, HR2, HR3). . Bottom bracket gear according to one of the preceding claims, characterized in that at least one of the planetary gear sets (RS1, RS2, RS3) is designed as a plus planetary gear set. bottom bracket gear claim 10 , characterized in that in a plus planetary gear set the first element is designed as a sun gear (SR1, SR2, SR3), the second element as a ring gear (HR1, HR2, HR3) and the third element as a planetary gear carrier (PT1, PT2, PT3). . Bottom bracket transmission according to one of the preceding claims, characterized in that in order to implement a first gear (V1), the fourth shifting element designed as a freewheel (F1) and the fifth shifting element designed as a freewheel (F2) as well as the sixth shifting element designed as a freewheel (F3) are blocked that to realize a second gear (V2) the second shifting element (B2) designed as a brake is closed and the fourth shifting element designed as a freewheel (F1) and the fifth shifting element (F2) designed as a freewheel are blocked, that for realizing a third gear (V3.1) the second shifting element (B2) designed as a brake and the third shifting element (B3) designed as a brake are closed and the fifth shifting element (F2) designed as a freewheel is locked, so that to realize a fourth gear (V4) the first the shifting element (B1) designed as a brake is closed and the fourth shifting element (F1) designed as a freewheel and the sixth shifting element (F3) designed as a freewheel are blocked, that to implement a fifth gear (V5) the first shifting element (B1) designed as a brake and the second shifting element (B2) designed as a brake are closed and the fourth shifting element (F1) designed as a freewheel is locked, and/or that to realize a sixth gear (V6.1) the first shifting element (B1) designed as a brake and the second switching element (B2) designed as a brake and the third switching element (B3) designed as a brake are closed. Bottom bracket transmission according to one of the preceding claims, characterized in that to implement an alternative third gear (V3.2), the third shifting element (B3) designed as a brake is closed and the fifth shifting element (F2) designed as a freewheel and the sixth shifting element designed as a freewheel (F3) are locked. Bottom bracket transmission according to one of the preceding claims, characterized in that to implement an alternative sixth gear (V6.2), the first shifting element designed as a brake (B1) and the third shifting element designed as a brake (B3) are closed, as well as the sixth shifting element designed as a freewheel (F3) is locked. Bicycle or pedelec (1) with the bottom bracket gear according to one of the preceding claims.

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