DE102022209144B3 - Planetary bottom bracket gear for a bicycle or pedelec - Google Patents

Abstract

A bottom bracket gearbox in planetary design for a bicycle or a Pedelec (1) with a pedal crankshaft (Wan) as a drive and a gearbox output shaft (Wab) as an output as well as at least four further shafts (W1, W2, W3, W4), with three planetary gear sets ( RS1, RS2, RS3), which are arranged coaxially to the pedal crankshaft (Wan), and with five switching elements (B1, B2, B3, F1, F2) to realize at least five gears (V1, V2, V3, V4, V5). , wherein the pedal crankshaft (Wan) is connected to a second element of a first planetary gear set (RS1), wherein the pedal crankshaft (Wan) has a fourth switching element (F1) and a second shaft (W2) with a third element of a second planetary gear set (RS2) can be connected, wherein the transmission output shaft (Wab) is connected to a first element of the first planetary gear set (RS1) and to a first element of a third planetary gear set (RS3), wherein a third element of the first planetary gear set (RS1) via a first shaft (W1) is connected to a second element of the second planetary gear set (RS2), wherein a first element of the second planetary gear set (RS2) is connected via a third shaft (W3) to a second element of the third planetary gear set (RS3), and wherein the first element of the second Planetary gear set (RS2) and the second element of the third planetary gear set (RS3) can be connected via the third shaft (W3) and via a fifth switching element (F2) to the second element of the first planetary gear set (RS1). Furthermore, a bicycle or pedelec (1) with the bottom bracket gear is proposed.

Description

The present invention relates to a bottom bracket gear in planetary design for a bicycle or a pedelec with a pedal crankshaft as a drive and a transmission output shaft as an output as well as at least four further shafts, with at least three planetary gear sets, which are arranged coaxially to the pedal crankshaft and with several switching elements for realizing several gears . The invention further relates to a bicycle or pedelec with the bottom bracket gear.

For example from the publication DE 10 2016 225 169 A1 is a planetary gearbox for a bicycle or pedelec. To achieve only four gears, the transmission includes at least two planetary gear sets, of which at least one planetary gear set is necessarily designed as a space-intensive plus planetary gear set. Furthermore, at least four switching elements are required. In a further embodiment variant of the transmission, four additional gears are achieved by adding two additional switching elements and another planetary gear set. Due to the intended interconnection or connection of the various planetary gear sets, the known transmission has a space-intensive design.

DE 10 2020 206 299 A1 shows a multi-stage transmission in planetary design for a bicycle or a pedelec with a transmission input shaft as a drive and a transmission output shaft as an output. The multi-stage transmission includes at least three planetary gear sets, with at least three one-way clutches and at least three brakes being provided to achieve at least 8 gears. In order to realize a multi-stage transmission with a particularly simple design, it is provided that a second element of the first planetary gear set is coupled as an input element directly or via at least one further element to the transmission input shaft, with a first element of the first planetary gear set being coupled as an output element to the transmission output shaft directly or via at least one further element is coupled. Furthermore, a third element of the first planetary gear set is connected as a coupling element to a second element of the second planetary gear set, wherein a first element of the second planetary gear set can be fixed via a first brake and the first element of the second planetary gear set is connected to the second element of the first via a first one-way clutch Planetary gear set can be connected. In addition, a third element of the second planetary gear set is connected to a second element of a third planetary gear set, wherein a first element of the third planetary gear set can be fixed via a second brake and the first element of the third planetary gear set can be connected to the first element of the first planetary gear set via a second one-way clutch is. Furthermore, a third element of the third planetary gear set can be connected to the first element of the first planetary gear set via a third one-way clutch, wherein the third element of the third planetary gear set can be fixed via a third brake.

DE 10 2021 209 258 A1 shows a bottom bracket gear. The transmission can be designed to provide different gears. The transmission has a planetary assembly. The planetary assembly may serve to provide a gear ratio and respective gears. The planetary assembly can, for example, have one or more planetary gear sets. The transmission can be used to transmit torque from an input of the transmission to an output of the transmission. For example, the transmission makes it possible to translate a slow rotation at an input, for example of a pedal crank, into a faster rotation at the output of the transmission and thus, for example, at a driven wheel of the bicycle. Each gear of the transmission can provide a gear ratio. Each gear can have a fixed mechanical gear ratio between the input and output of the transmission. The gearbox can enable a high gear ratio spread with high efficiency. The transmission is designed to provide four gears. These gears can be shifted, for example, by actuating respective switching elements and, alternatively or additionally, respective brakes. However, some of the switching elements can also change their state automatically, so that no active operation is necessary for changing gears.

DE 10 2021 204 634 B3 shows a bottom bracket gear. The transmission can be designed to provide different gears. The transmission has a planetary assembly. The planetary assembly may serve to provide a gear ratio and respective gears. The planetary assembly can, for example, have one or more planetary gear sets. The transmission can be used to transmit torque from an input of the transmission to an output of the transmission. For example, the transmission makes it possible to translate a slow rotation at an input, for example of a pedal crank, into a faster rotation at the output of the transmission and thus, for example, at a driven wheel of the bicycle. Each gear of the transmission can provide a gear ratio. Each gear can have a fixed mechanical gear ratio between the input and output of the transmission. The transmission can have a high transmission spread with high efficiency and enable the usual gear ratios of the respective planetary gear sets. The transmission is designed to provide at least four gears. The transmission can, for example, also be designed to provide exactly eight gears. These gears can be shifted, for example, by actuating respective switching elements and, alternatively or additionally, respective brakes. However, some of the switching elements can also change their state automatically, so that no active operation is necessary for changing gears.

Accordingly, the present invention is based on the object of realizing a bottom bracket gear of the type described above with as little construction effort as possible with as few components as possible, with at least five gears being able to be implemented.

This task is solved by the objects with the features of patent claims 1 and 12 respectively. Advantageous and claimed further developments result from the subclaims and the description as well as the drawings.

A planetary bottom bracket gearbox is therefore proposed for a bicycle or a pedelec. The bottom bracket gear has a pedal crankshaft as a drive and a transmission output shaft as an output as well as at least four further shafts, the output preferably taking place via a chain wheel, a belt wheel or the like. Furthermore, the bottom bracket gear includes three planetary gear sets, which are arranged coaxially to the pedal crankshaft, and five switching elements for realizing at least five gears in the proposed bottom bracket gear. 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 a first planetary gear set. In addition, the pedal crankshaft can be connected to a third element of a second planetary gear set via a fourth switching element and a second shaft, the transmission output shaft being connected to a first element of the first planetary gear set and to a first element of a third planetary gear set. Furthermore, a third element of the first planetary gear set is connected to a second element of the second planetary gear set via a first shaft. A first element of the second planetary gear set is connected via a third shaft to a second element of the third planetary gear set, the first element of the second planetary gear set and the second element of the third planetary gear set via the third shaft and via a fifth switching element to the second element of the first planetary gear set are connectable.

In this way, with the above-described connection of only three planetary gear sets provided and only five switching elements provided, a particularly simple and compact structure is achieved in the proposed bottom bracket gear. In addition, there are particularly low component loads and an advantageously high gearing efficiency due to the geometric gear range in the bottom bracket gear.

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

In order to realize the particularly space-saving arrangement in the proposed bottom bracket gear, it is provided that when the first switching element is closed, the second shaft connected to the third element of the second planetary gear set is connected to a housing or to a component fixed to the housing or the like, so that when the second switching element is closed a third shaft connected to the first element of the second planetary gear set and to the second element of the third planetary gear set is connected to the housing, and that when the third switching element is closed, a fourth shaft connected to a third element of the third planetary gear set is connected to the housing.

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

The switching elements designed as brakes are preferably designed as positive switching elements, for example as inexpensive switching claws or the like, for example with a toothed brake ring and a corresponding switching pawl. Brakes as switching elements have the advantage that they can be easily accessed from outside for actuation. Since the freewheels provided are used as clutches, it is an advantage if the brakes z. B. are designed as one-way brakes to prevent the transmission from blocking when the direction of rotation is reversed on the drive 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 it is locked. No torque is transmitted in the opposite direction of rotation. However, it is conceivable that switchable freewheels or switchable freewheel brakes can also be used.

A preferred embodiment of the invention can provide that at least one of the planetary gear sets provided is designed as a minus planetary gear set, which results 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 are swapped with one another and the amount of the stationary gear ratio is increased by 1. A minus planetary gear set has rotatably mounted planet gears on its planet gear carrier, 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 sun gear rotation direction when the planet gear carrier is held and the sun gear is rotating. A plus planetary gear set has inner and outer planetary gears that are rotatably mounted on its planetary gear carrier and mesh with one another, with the sun gear of this planetary gearset meshing with the inner planetary gears and the ring gear of this planetary gearset meshing with the outer planetary gears, so that the ring gear is in position when the planetary gear carrier is held in place and rotating Sun gear rotates in the same direction of rotation as the sun gear rotation.

For the person skilled in the art, this means that in the case of the individual gear sets designed as minus planetary gear sets, a first element or gear set element is designed as a sun gear, a second element is designed as a planet gear carrier or web, and a third element is designed as a ring gear. This also means that in an individual 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 planet gear carrier or web.

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 drive and/or on the output.

In order to electrically support the drive in the proposed bottom bracket gear, 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 transmission output shaft or be coupled in a fixed or detachable manner. Preferably, the electric machine can be arranged axially parallel to the pedal crankshaft.

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

The present invention is explained further below with reference to the drawings.

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

Show it:

• 1 a schematic principle view of a possible embodiment variant of a bottom bracket gear in planetary design for a bicycle or pedelec;
• 2 a schematic principle view of the bottom bracket gear according to 1 with a plus planetary gear set designed, for example, as a second planetary gear set;
• 3 a schematic principle view of the bottom bracket gear according to 1 with a plus planetary gear set designed, for example, as a third planetary gear set;
• 4 a schematic view of the bottom bracket gear according to 1 with a torque sensor on the drive, indicated as an example;
• 5 a schematic view of the bottom bracket gear according to 4 with an electrical machine arranged, for example, on the drive;
• 6 a schematic view of the bottom bracket gear according to 4 with an electrical machine arranged, for example, on the output; and
• 7 a switching diagram with the switchable gears in the bottom bracket gear according to the invention 1 until 6 .

In the 1 until 6 Various embodiments are shown merely by way of example based on schematic principle views of a bottom bracket gear according to the invention in planetary design for a bicycle or a Pedelec 1. 1 shows the schematically indicated bicycle or Pedelec 1 with the bottom bracket gear.

Regardless of the versions, the bottom bracket gear is contained in a housing Hungally bottom bracket housing 2 a pedal crankshaft or pedal crank Wan as a drive with the pedals and a transmission output shaft Wab as an output with a chain or belt wheel, not shown. Furthermore, four further shafts W1, W2, W3, W4 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 with the pedal crankshaft Wan. In addition, five switching elements B1, B2, B3, F1, F2 are provided for realizing five gears V1, V2, V3, V4, V5. The first switching element B1 and the second switching element B2 as well as the third switching element B3 are each designed as switchable brakes, while the fourth switching element F1 and the fifth switching element F2 are each designed as non-switchable freewheels.

Furthermore, regardless of the embodiments in the proposed bottom bracket gearbox, it is provided that the pedal crankshaft Wan is connected to a second element of a first planetary gear set RS1, that the pedal crankshaft Wan can be connected to a third element of a second planetary gear set RS2 via a fourth switching element F1 and a second shaft W2 is that the transmission output shaft Wab is connected to a first element of the first planetary gear set RS1 and to a first element of a third planetary gear set RS3, that a third element of the first planetary gear set RS1 is connected via a first shaft W1 to a second element of the second planetary gear set RS2, that a first element of the second planetary gear set RS2 is connected to a second element of the third planetary gear set RS3 via a third shaft W3, and that the first element of the second planetary gear set RS2 and the second element of the third planetary gear set RS3 via the third shaft W3 and via a fifth Switching element F2 can be connected to the second element of the first planetary gear set RS1.

In addition, it is provided in the bottom bracket gear that when the first switching element B1 is closed, the second shaft W2 connected to the third element of the second planetary gear set RS2 is connected to a housing 2, that when the second switching element B2 is closed, the second shaft W2 connected to the third element of the second planetary gear set RS2 and third shaft W3 connected to the second element of the third planetary gear set RS3 is connected to the housing 2, and that when the third switching element B3 is closed, a fourth shaft W4 connected to a third element of the third planetary gear set RS3 is connected to the housing 2.

The above-described connection of the elements of the planetary gear sets RS1, RS2, RS3 and the shafts Wan, Wab, W1, W2, W3, W4 as well as the switching elements B1, B2, B3, F1, F2 results in a particularly space-saving design of the bottom bracket gear.

In the 1 and 4 until 6 The three planned planetary gear sets RS1, RS2, RS3 are each designed as space-saving minus planetary gear sets. It is provided here that a sun gear SR1, SR2, SR3 is provided as the first element or gear set element, a planet gear carrier PT1, PT2, PT3 as a second element and a ring gear HR1, HR2, HR3 as a third element in the planetary gear sets RS1, RS2, RS3 .

In detail, this shows that the pedal crankshaft Wan is connected to the planetary gear carrier PT1 of the first planetary gearset RS1. Furthermore, the pedal crankshaft Wan can be connected to the ring gear HR2 of the second planetary gear set RS2 via the fourth switching element F1, which is designed as a freewheel, 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 and to the sun gear SR3 of the third planetary gear set RS3. The ring gear HR1 of the first planetary gear set RS1 is connected to the planet gear carrier PT2 of the second planetary gear set RS2 via the first shaft W1. Furthermore, the sun gear SR2 of the second planetary gear set RS2 is connected to the planet gear carrier PT3 of the third planetary gear set RS3 via the third shaft W3. In addition, the sun gear SR2 of the second planetary gear set RS2 and the planetary gear carrier PT3 of the third planetary gear set RS3 can be connected via the third shaft W3 and via the fifth switching element F2, which is designed as a freewheel, to the planetary gear carrier PT1 of the first planetary gear set RS1 and thus to the pedal crankshaft Wan.

When the first switching element B1, designed as a brake, is closed, the ring gear HR2 of the second planetary gear set RS2 is connected to the housing 2 via the second shaft W2. When the second switching element B2, designed as a brake, is closed, the sun gear SR2 of the second planetary gear set RS2 and the planet gear carrier PT3 of the third planetary gear set RS3 are connected to the housing 2 via the second shaft W2. When the third switching element B3, designed as a brake, is closed, the ring gear HR3 of the third planetary gear set RS3 is connected to the housing 2 via the fourth shaft W4. When the fourth switching element F1, designed as a freewheel, is locked, the pedal crankshaft Wan is connected to the second shaft W2 and thus to the ring gear HR2 of the second planetary gear set RS2. When locked as Freewheeling fifth switching element F2, the pedal crankshaft Wan is connected to the third shaft W3.

In the 2 and 3 For the three planned planetary gear sets RS1, RS2, RS3, a plus planetary gear set is always provided, with the plus planetary gear set resulting in an interchange of the ring gear connection and the planetary gear carrier connection.

In 2 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 3 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 choice of gear ratios. For example, a current translation of e.g. E.g. i0 = -2.0 a standard gear ratio i0 = +3.0.

In 4 an embodiment of the bottom bracket gear 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 designed in another way.

In the 5 and 6 An embodiment of the bottom bracket gear according to the invention is shown with an additional electric machine EM. The electric machine EM can be connected to the pedal crankshaft Wan, as shown in 5 is indicated. It is also conceivable that the electric machine EM is connected to the transmission output shaft Wab, as shown in 6 is shown. The electric machine EM is preferably arranged axially parallel to the pedal crankshaft Wan. However, a coaxial arrangement of the electric machine EM to the pedal crankshaft Wan would also be possible. Regardless, it is advantageous to connect the electrical machine EM via a freewheel or the like, so that no losses are caused by the co-rotating electrical machine EM when operating without the electrical machine EM.

In 7 is an example of a circuit diagram for the ones in the 1 until 6 shown versions of the bottom bracket gear according to the invention. The switching diagram shows the switching elements B1, B2, B3, F1, F2 used for the respective gear V1, V2, V3, V4, V5. Here, an This works automatically without any external action. Furthermore, an X for a brake B1, B2, B3 as a switching element in the switching diagram means that the brake B1, B2, B3 is closed. This works via suitable actuators.

The details can be seen from the circuit diagram 7 that to achieve a first gear V1, the fourth switching element F1, designed as a freewheel, and the fifth switching element F2, designed as a freewheel, are locked, that to realize a second gear V2, the third switching element B3, designed as a brake, is closed and the fourth switching element F1, designed as a freewheel is blocked, that in order to realize a third gear V3, the second switching element B2, designed as a brake, is closed and the fourth switching element F1, designed as a freewheel, is blocked, that in order to realize a fourth gear V4, the first switching element B1, designed as a brake, is closed and the fifth as Freewheeling switching element F2 is locked, and / or that in order to achieve a fifth gear V5, the first switching element B1, designed as a brake, and the second switching element B2, designed as a brake, are closed.

Reference symbols

1

Bicycle or a Pedelec

2

Housing or bottom bracket housing

3

Torque sensor

SR1

Sun gear of the first planetary gear set

PT1

Planetary gear 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

Planetary gear 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

Planetary gear carrier of the third planetary gear set

HR3

Ring gear of the third planetary gear set

Wan

pedal crankshaft

Wow

Transmission output shaft

E.M

electric machine

W1

first wave

W2

second wave

W3

third wave

W4

fourth 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

V1

first course

V2

second gear

V3

third gear

V4

fourth gear

V5

fifth gear

Claims (12)

Bottom bracket gearbox in planetary design for a bicycle or a pedelec (1), with a pedal crankshaft (Wan) as a drive and a transmission output shaft (Wab) as an output and at least four further shafts (W1, W2, W3, W4), with three planetary gear sets (RS1, RS2, RS3), which are arranged coaxially to the pedal crankshaft (Wan), and with five switching elements (B1, B2, B3, F1, F2) for realizing at least five gears (V1, V2, V3, V4, V5), whereby the The pedal crankshaft (Wan) is connected to a second element of a first planetary gear set (RS1), the pedal crankshaft (Wan) being connectable to a third element of a second planetary gear set (RS2) via a fourth switching element (F1) and a second shaft (W2), wherein the transmission output shaft (Wab) is connected to a first element of the first planetary gear set (RS1) and to a first element of a third planetary gear set (RS3), wherein a third element of the first planetary gear set (RS1) is connected via a first shaft (W1) to a second Element of the second planetary gear set (RS2) is connected, wherein a first element of the second planetary gear set (RS2) is connected via a third shaft (W3) to a second element of the third planetary gear set (RS3), and wherein the first element of the second planetary gear set (RS2 ) and the second element of the third planetary gear set (RS3) can be connected to the second element of the first planetary gear set (RS1) via the third shaft (W3) and via a fifth switching element (F2). Bottom bracket gear Claim 1 , wherein when the first switching element (B1) is closed, the second shaft (W2) connected to the third element of the second planetary gear set (RS2) is connected to a housing (2), that when the second switching element (B2) is closed, the second shaft (W2) connected to the first element of the second Planetary gear set (RS2) and a third shaft (W3) connected to the second element of the third planetary gear set (RS3) are connected to the housing (2), and that when the third switching element (B3) is closed, a third element of the third planetary gear set (RS3) connected fourth shaft (W4) is connected to the housing (2). Bottom bracket gear Claim 1 or 2 , wherein the first switching element (B1), the second switching element (B2) and the third switching element (B3) are each designed as a positive brake and / or that the fourth switching element (F1) and the fifth switching element (F2) are each designed as a freewheel . Bottom bracket gear according to one of the preceding claims, wherein at least one of the planetary gear sets (RS1, RS2, RS3) is designed as a minus planetary gear set. Bottom bracket gear Claim 4 , whereby 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, wherein at least one of the planetary gear sets (RS1, RS2, RS3) is designed as a plus planetary gear set. Bottom bracket gear Claim 6 , whereby 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 planet gear carrier (PT1, PT2, PT3). Bottom bracket gear according to one of the preceding claims, wherein a torque sensor (3) is connected to the pedal crankshaft (Wan). Bottom bracket gear according to one of the preceding claims, wherein at least one electric machine (EM) is connected or connectable to the pedal crankshaft (Wan) or to the transmission output shaft (Wab). Bottom bracket gear Claim 9 , whereby the electric machine (EM) is arranged axially parallel to the pedal crankshaft (Wan). Bottom bracket gear according to one of the preceding claims, wherein in order to achieve a first gear (V1), the fourth switching element (F1) designed as a freewheel and the fifth switching element (F2) designed as a freewheel are locked, so that in order to realize a second gear (V2), the third as The switching element (B3) designed as a brake is closed and the fourth switching element (F1) designed as a freewheel is locked, so that in order to achieve a third gear (V3), the second switching element (B2) designed as a brake is closed and the fourth switching element (F1) designed as a freewheel ) is locked, that to achieve a fourth gear (V4), the first switching element (B1) designed as a brake is closed and the fifth switching element (F2) designed as a freewheel is locked, and / or that to realize a fifth gear (V5). first switching element (B1) designed as a brake and the second switching element (B2) designed as a brake are closed. Bicycle or pedelec (1) with the bottom bracket gear according to one of the preceding claims.

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