Planetary bottom bracket gear for a Pedelec and Pedelec

Abstract

Bottom bracket gear in planetary design for a pedelec, with a bottom bracket crankshaft (1) and with three planetary gear sets (RS1, RS2, RS3, RSV) and with an electric machine (EM), wherein the planetary gear sets (RS1, RS2, RS3, RSV) and the electric machine (EM) are arranged coaxially to the bottom bracket crankshaft (1), wherein a sun gear (4) as the input of a first planetary gear set (RS1) is connectable or connected to a rotor (16) of the electric machine (EM), wherein a planet gear carrier (5) as the output of the first planetary gear set (RS1) is connectable or connected to a sun gear (7) as the input of the second planetary gear set (RS2), wherein a gear set element as the output of the second planetary gear set (RS2) and / or of a primary planetary gear set (RSV) or of a third planetary gear set (RS3) is connectable or connected to an output (2), and wherein a gear set element of each Planetary gear set (RS1, RS2, RS3, RSV) can be fixed or is fixed,characterized in that the bottom bracket crankshaft (1) is connected to a planetary gear carrier (11) of the third planetary gear set (RS3) and to the output (2), in that the rotor (16) of the electric machine (EM) is connected to the sun gear (4) of the first planetary gear set (RS1), in that a ring gear (6) of the first planetary gear set (RS1) is fixed to the bottom bracket shell (3), in that a ring gear (9) of the second planetary gear set (RS2) is fixed to the bottom bracket shell (3), in that a planetary gear carrier (8) of the second planetary gear set (RS2) is connected to a sun gear (10) of the third planetary gear set (RS3), in that a ring gear (12) of the third planetary gear set (RS3) is fixed to the bottom bracket shell (3), and in that a planetary gear carrier (11) of the third planetary gear set (RS3) is connected to the output (2) and the bottom bracket crankshaft (1) is.,

Description

[0001] The invention relates to a planetary bottom bracket gear for a pedelec. Furthermore, the invention relates to a pedelec with the bottom bracket gear.

[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 feature an electric motor to assist the rider. In some applications, pedelecs or e-bikes 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 installed 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 the electric drive or electric motor is arranged in the bottom bracket area, parallel to the axis of the bottom bracket crankshaft. This parallel axis arrangement requires a lot of installation space.

[0003] From the publication DE 10 2009 038 912 A1, an electric machine arranged coaxially to the pedal crankshaft is known as a drive system with two planetary gear sets for a motor-assisted bicycle.

[0004] CN 2 251 526 Y relates to a bicycle powered by an electric auxiliary unit comprising a frame, a motor, several planetary gear groups and a ring gear, the components being mounted on a crankshaft and the motor reducing the speed via the planetary gear groups to assist the rider in moving forward.

[0005] US 6 629 574 B2 relates to an electric bicycle whose motor assembly comprises a housing, a shaft rotating therein, a stator, a rotor, an output shaft and a transmission system, wherein the rotor is arranged around the shaft and the transmission system rotates the output shaft during operation of the motor.

[0006] CN 1 00 406 343 C relates to an electric bicycle with a central, coaxial drive train consisting of an electric drive system, a manual drive system and a torque sensor, wherein the drive shafts are arranged coaxially and the power is transmitted via planetary gears.

[0007] JP H09-169290 A relates to a bicycle with an auxiliary drive device and a directly coupled planetary gear. It integrates a one-way clutch between the crankshaft and the drive shaft sprocket, as well as a two-stage planetary gear and one-way clutch between the motor and the drive shaft sprocket.

[0008] JP H08-282 574 A relates to an electric bicycle in which an electric motor and a planetary gear for speed reduction are arranged around a crankshaft to create a compact and lightweight drive unit.

[0009] CN 2 04 606 121 U relates to a drive device for electric bicycles, which is formed by the integration of an external rotor motor, a sine wave controller, a centrally arranged torque sensor, a two-stage planetary gear, a pawl clutch, a pawl central axis, a pedal crank and a chain wheel.

[0010] DE 10 2017 111 770 A1 (post-published) relates to a drive unit for a bicycle with a housing, with a shaft by means of which a first torque is introduced, with an electric motor arranged coaxially around the shaft, by means of which a second torque is introduced, with an output which serves to add the first and the second torque, with at least a single-stage transmission which is arranged in the power flow between the electric motor and the output.

[0011] DE 20 2004 010 269 U1 relates to a drive mechanism for electric bicycles, comprising a motor with a hollow output shaft having a drive pinion at the front as a sun gear of the planetary gear of the power transmission unit, wherein the central axis of the crank mechanism passes through the hollow output shaft of the motor.

[0012] EP 2 740 660 A1 relates to a pedal-assist device for pedal-driven vehicles in which the axes of the drive means, the mechanical reduction means and the bottom bracket shaft are arranged coaxially.

[0013] The present invention is based on the object of specifying a bottom bracket gear or a pedelec with the bottom bracket gear, which realizes an optimized motor support with high efficiency and the smallest possible space requirement.

[0014] This object is achieved according to the invention by the subject matter having the features of the independent patent claims, wherein advantageous and claimed developments result from the subclaims and the description as well as the drawings.

[0015] Thus, a bottom bracket gear in planetary design for a pedelec with a bottom bracket crankshaft and three planetary gear sets as well as with an electric machine is proposed, wherein the planetary gear sets and the electric machine are arranged coaxially to the bottom bracket crankshaft in a space-efficient manner. Optimized support is achieved in that a sun gear as the input of a first planetary gear set is connectable or connected to a rotor of the electric machine, wherein a planet gear carrier as the output of the first planetary gear set is connectable or connected to a sun gear as the input of the second planetary gear set, wherein a gear set element as the output of the second planetary gear set and / or of a primary planetary gear set or of a third planetary gear set is connectable or connected to an output, and wherein a gear set element of each planetary gear set is lockable or locked.

[0016] In this way, a gear set arrangement for the bottom bracket gearbox is realized which, due to the interconnection of the gear sets, achieves a particularly high power density with the highest possible efficiency, so that a high level of system integration is achieved, regardless of the axial order in which the individual planetary gear sets are arranged.

[0017] The bottom bracket gear proposed according to the invention comprises a coaxially arranged electric motor or coaxially arranged electric machines with a coaxially arranged planetary reduction gear. The reduction gear consists of several interconnected individual planetary gear sets. It is possible for the reduction gear to be coupled to at least one primary planetary gear set.

[0018] Within the scope of a particularly advantageous development of the invention, it can be provided that the individual gear sets are designed as a first planetary gear set, a second planetary gear set and a third planetary gear set or a primary planetary gear set and are arranged axially next to one another in a bottom bracket shell of the pedelec, wherein preferably a first freewheel and / or a second freewheel are provided. The respective freewheel, which is also referred to as an overrunning clutch, is a clutch that only acts in one direction of rotation. If the direction of rotation is reversed or if the speed of the component actually encountered is greater than that of the driving component, the connection is automatically released. An overrunning drive or an overrunning drive state of a freewheel means that the freewheel is not locked. The freewheel can be in an overrunning drive if one of the elements connected to the freewheel rotates so fast that the freewheel cannot lock.The locking direction state of a freewheel means that the freewheel is locking.

[0019] The first freewheel is preferably located between the bottom bracket crankshaft and the output, which allows the electric motor to continue rotating when pedaling has already stopped.

[0020] The second freewheel is preferably positioned between the electric motor and the output. This prevents a deactivated electric motor from rotating during pedaling, effectively preventing drag torque caused by the deactivated electric motor.

[0021] A further aspect of the present invention is to also provide a pedelec or the like with the prescribed bottom bracket gear, whereby the advantages already described and further advantages result.

[0022] The present invention is further explained below with reference to the drawings. They show: Fig. 1 a gear diagram of a first embodiment of a bottom bracket gear according to the invention with three gear sets forming a reduction gear; Fig. 1A a gear diagram with a variant of the bottom bracket gear according to Fig. 1 with a first and a second freewheel; Fig. 2 a gear diagram of a second embodiment of the bottom bracket gear according to the invention with three gear sets forming a reduction gear; Fig. 2A a gear diagram with a variant of the bottom bracket gear according to Fig. 2 with a first and a second freewheel; Fig. 3 a gear diagram of a third embodiment of the bottom bracket gear according to the invention with two gear sets forming a reduction gear and a planetary gear set; and Fig. 3A a gear diagram with a variant of the bottom bracket gear according to Fig. 3 with a first and a second freewheel.

[0023] In the Fig. 1 to 3A show various embodiments of a bottom bracket gear according to the invention in planetary design for an e-bicycle or pedelec or the like by way of example.

[0024] Regardless of the respective design variants, the bottom bracket transmission comprises a bottom bracket crankshaft 1 and three planetary gear sets RS1, RS2, RS3, RSV as well as an electric machine EM or an electric motor, wherein the planetary gear sets RS1, RS2, RS3, RSV and the electric machine EM, which can be operated as a motor or generator, are arranged coaxially to the pedal crankshaft 1. A sun gear 4, as the input of a first planetary gear set RS1, is connectable or connected to a rotor 16 of the electric machine EM, wherein a planet gear carrier 5, as the output of the first planetary gear set RS1, is connectable or connected to a sun gear 7 as the input of the second planetary gear set RS2. A gear set element, as the output of the second planetary gear set RS2 and / or of a primary planetary gear set RSV or of a third planetary gear set RS3, is connectable or connected to an output 2.In addition, a gear set element of each planetary gear set RS1, RS2, RS3, RSV can be or is fixed to a bottom bracket shell 3.

[0025] In the Fig. 1A, Fig. 2A, Fig. 3A shows variants of the three design variants, in which a first freewheel F1 and a second freewheel F2 are shown as examples.

[0026] In the first variant according to Fig. 1 and Fig. 1 A, the first planetary gear set RS1 and the second planetary gear set RS2 as well as the third planetary gear set RS3 are arranged axially next to one another in the bottom bracket shell 3, with the three planetary gear sets RS1, RS2, RS3 being designed as reduction gear sets and thus forming a triple reduction gear. The input of the reduction gear is connected to the electric machine EM, with the output of the reduction gear being connected to the bottom bracket crankshaft 1 and the output 2, with the output 2 being formed, for example, by a chainring or belt pulley. In this way, a very high gear ratio of up to 100 or more is possible for the electric machine EM, which saves space.

[0027] In the first variant according to Fig. 1, it is provided that the bottom bracket crankshaft 1 is connected to a planetary gear carrier 11 of the third planetary gear set RS3 and to the output 2. Furthermore, the rotor 16 of the electric machine EM is connected to the sun gear 4 of the first planetary gear set RS1, with a ring gear 6 of the first planetary gear set RS1 being fixed to the bottom bracket shell 3. A ring gear 9 of the second planetary gear set RS2 is fixed to the bottom bracket shell 3, with a planetary gear carrier 8 of the second planetary gear set RS2 being connected to a sun gear 10 of the third planetary gear set RS3. Furthermore, a ring gear 12 of the third planetary gear set RS3 is fixed to the bottom bracket shell 3.

[0028] In the variant according to Fig. 1A, the first freewheel F1 is provided between the bottom bracket crankshaft 1 and the output 2, while the second freewheel F2 is provided between the planetary gear carrier 11 of the third planetary gear set RS3 and the output 2.

[0029] In addition, optional arrangement positions of the second freewheel F2 are possible in the first embodiment as follows. The second freewheel F2 can also be provided between the planetary gear carrier 8 of the second planetary gear set 2 and the sun gear 10 of the third planetary gear set 3, or between the planetary gear carrier 5 of the first planetary gear set RS1 and the sun gear 7 of the second planetary gear set RS2, or between the rotor 16 of the electric machine EM and the sun gear 4 of the first planetary gear set RS1, or between the ring gear 6 of the first planetary gear set RS1 and the bottom bracket shell 3, or between the ring gear 9 of the second planetary gear set RS2 and the bottom bracket shell 3, or between the ring gear 12 of the third planetary gear set RS3 and the bottom bracket shell 3.

[0030] In the second variant according to Fig. 2 and Fig. 2A also features a triple reduction gear consisting of the three planetary gear sets RS1, RS2, and RS3, designed as reduction gear sets. The output of the penultimate or middle single planetary gear set is coupled to the bottom bracket crankshaft 1, whereby the bottom bracket crankshaft 1 also experiences a slow gear ratio. The last single planetary gear set of the triple reduction gear is connected to the chainring or output 2. This measure expands the chain ratio design options.

[0031] In the second variant according to Fig. 2, it is provided that the bottom bracket crankshaft 1 is connected to the planetary gear carrier 8 of the second planetary gear set RS2 and to the sun gear 10 of the third planetary gear set RS3, wherein the rotor 16 of the electric machine EM is connected to the sun gear 4 of the first planetary gear set RS1. Furthermore, the ring gear 6 of the first planetary gear set RS1 is fixed to the bottom bracket shell 3, wherein the ring gear 9 of the second planetary gear set RS2 is fixed to the bottom bracket shell 3. In addition, the ring gear 12 of the third planetary gear set RS3 is fixed to the bottom bracket shell 3, and the planetary gear carrier 11 of the third planetary gear set RS3 is connected to the output 2.

[0032] In the variant according to Fig. 2A, it is provided that the first freewheel F1 is provided between the bottom bracket crankshaft 1 and the sun gear 10 of the third planetary gear set RS3, while the second freewheel F2 is arranged between the planet gear carrier 8 of the second planetary gear set 2 and the sun gear 10 of the third planetary gear set 3.

[0033] In addition, optional arrangement positions of the second freewheel F2 are possible in the second embodiment as follows. The second freewheel F2 can also be provided between the planetary gear carrier 5 of the first planetary gear set RS1 and the sun gear 7 of the second planetary gear set RS2, or between the rotor 16 of the electric machine EM and the sun gear 4 of the first planetary gear set RS1, or between the ring gear 6 of the first planetary gear set RS1 and the bottom bracket shell 3, or between the ring gear 9 of the second planetary gear set RS2 and the bottom bracket shell 3.

[0034] In the third variant according to Fig. 3 and Fig. 3A, the bottom bracket crankshaft 1 is coupled to a single planetary gear set, preferably with a high-speed transmission, as a front-mounted planetary gear set RSV, the output of which is connected to the output 2 or the chainring. The input of the reduction gear consisting of the two individual reduction gear sets RS1 and RS2 is coupled to the electric motor EM, while the output of the reduction gear is coupled to the output 2. In this way, the loads on the output 2 or the chainring are reduced, and the chainring can advantageously be made smaller and thus have a shorter gear ratio in order to compensate for the previous high-speed transmission of the bottom bracket crankshaft 1. Due to the shorter transmission at the output or on the chain of the pedelec, an additional reduction gear set can advantageously be dispensed with.

[0035] In the third variant according to Fig. 3, it is provided that the bottom bracket crankshaft 1 is connected to a planetary gear carrier 14 of the primary planetary gear set RSV, wherein a ring gear 15 of the primary planetary gear set RSV is connected to the output 2. In addition, a sun gear 13 of the primary planetary gear set RSV is fixed to the bottom bracket shell 3, wherein the rotor 16 of the electric machine EM is connected to the sun gear 4 of the first planetary gear set RS1. Furthermore, the ring gear 6 of the first planetary gear set RS1 is fixed to the bottom bracket shell 3, wherein the ring gear 9 of the second planetary gear set RS2 is fixed to the bottom bracket shell 3, and wherein the planetary gear carrier 8 of the second planetary gear set RS2 is connected to the output 2.

[0036] In the variant according to Fig.3A, it is provided that the first freewheel F1 is arranged between the bottom bracket crankshaft 1 and the planetary gear carrier 14 of the primary planetary gear set RSV, while the second freewheel F2 is provided between the planetary gear carrier 8 of the second planetary gear set RS2 and the ring gear 15 of the primary planetary gear set RSV.

[0037] In addition, optional arrangement positions of the first freewheel F1 and the second freewheel F2 are possible in the third embodiment as follows. The first freewheel F1 can also be provided between the output 2 and the ring gear 15 of the primary planetary gear set RSV or between the bottom bracket shell 3 and the sun gear 13 of the primary planetary gear set RSV, while the second freewheel F2 can also be provided between the planet gear carrier 5 of the first planetary gear set RS1 and the sun gear 7 of the second planetary gear set RS2 or between the rotor 16 of the electric machine EM and the sun gear 4 of the first planetary gear set RS1 or between the ring gear 6 of the first planetary gear set RS1 and the bottom bracket shell 3 or between the ring gear 9 of the second planetary gear set RS2 and the bottom bracket shell 3. Reference symbol 1 bottom bracket crankshaft 2 downforce 3 bottom bracket shell 4 Sun gear of the first planetary gear set 5 Planet gear carrier of the first planetary gear set 6 Ring gear of the first planetary gear set 7 Sun gear of the second planetary gear set 8 Planet gear carrier of the second planetary gear set 9 Ring gear of the second planetary gear set 10 Sun gear of the third planetary gear set 11 Planet gear carrier of the third planetary gear set 12 Ring gear of the third planetary gear set 13 Sun gear of the planetary gear set 14 Planet gear carrier of the primary planetary gear set 15 Ring gear of the planetary gear set 16 Rotor EM electric machine F1 first freewheel F2 second freewheel RS1 first planetary gear set RS2 second planetary gear set RS3 third planetary gear set RSV planetary gear set

Claims

[1] Bottom bracket gear in planetary design for a pedelec, with a bottom bracket crankshaft (1) and with three planetary gear sets (RS1, RS2, RS3, RSV) and with an electric machine (EM), wherein the planetary gear sets (RS1, RS2, RS3, RSV) and the electric machine (EM) are arranged coaxially to the bottom bracket crankshaft (1), wherein a sun gear (4) as the input of a first planetary gear set (RS1) is connectable or connected to a rotor (16) of the electric machine (EM), wherein a planet gear carrier (5) as the output of the first planetary gear set (RS1) is connectable or connected to a sun gear (7) as the input of the second planetary gear set (RS2), wherein a gear set element as the output of the second planetary gear set (RS2) and / or of a primary planetary gear set (RSV) or of a third planetary gear set (RS3) is connectable or connected to an output (2), and wherein a gear set element each planetary gear set (RS1, RS2, RS3, RSV) can be fixed or is fixed,characterized by that the bottom bracket crankshaft (1) is connected to a planet gear carrier (11) of the third planetary gear set (RS3) and to the output (2), that the rotor (16) of the electric machine (EM) is connected to the sun gear (4) of the first planetary gear set (RS1), that a ring gear (6) of the first planetary gear set (RS1) is fixed to the bottom bracket shell (3), that a ring gear (9) of the second planetary gear set (RS2) is fixed to the bottom bracket shell (3), that a planet gear carrier (8) of the second planetary gear set (RS2) is connected to a sun gear (10) of the third planetary gear set (RS3), that a ring gear (12) of the third planetary gear set (RS3) is fixed to the bottom bracket shell (3), and that a planet gear carrier (11) of the third planetary gear set (RS3) is connected to the output (2) and the bottom bracket crankshaft (1). [2] Bottom bracket gear according to claim 1, characterized bythat the first planetary gear set (RS1) and the second planetary gear set (RS2) as well as the third planetary gear set (RS3) or the front-mounted planetary gear set (RSV) are arranged axially next to one another in a bottom bracket housing (3), wherein a first freewheel (F1) and / or a second freewheel (F2) are provided. [3] Bottom bracket gear according to one of the preceding claims, characterized by that the first planetary gear set (RS1), the second planetary gear set (RS2) and the third planetary gear set (RS3) together form a reduction gear as individual reduction gear sets. [4] Bottom bracket gear according to one of claims 1 to 3, characterized bythat a first freewheel (F1) is provided between the bottom bracket crankshaft (1) and the output (2), and / or that a second freewheel (F2) is provided between the planetary gear carrier (11) of the third planetary gear set (RS3) and the output (2) or between the planetary gear carrier (8) of the second planetary gear set (2) and the sun gear (10) of the third planetary gear set (3) or between the planetary gear carrier (5) of the first planetary gear set (RS1) and the sun gear (7) of the second planetary gear set (RS2) or between the rotor (16) of the electric machine (EM) and the sun gear (4) of the first planetary gear set (RS1) or between the ring gear (6) of the first planetary gear set (RS1) and the bottom bracket shell (3) or between the ring gear (9) of the second planetary gear set (RS2) and the bottom bracket shell (3) or between the ring gear (12) of the third planetary gear set (RS3) and the bottom bracket shell (3). [5] Bottom bracket gear in planetary design for a pedelec, with a bottom bracket crankshaft (1) and with three planetary gear sets (RS1, RS2, RS3, RSV) and with an electric machine (EM), wherein the planetary gear sets (RS1, RS2, RS3, RSV) and the electric machine (EM) are arranged coaxially to the bottom bracket crankshaft (1), wherein a sun gear (4) as the input of a first planetary gear set (RS1) is connectable or connected to a rotor (16) of the electric machine (EM), wherein a planet gear carrier (5) as the output of the first planetary gear set (RS1) is connectable or connected to a sun gear (7) as the input of the second planetary gear set (RS2), wherein a gear set element as the output of the second planetary gear set (RS2) and / or of a front-mounted planetary gear set (RSV) or of a third planetary gear set (RS3) is connectable or connected to an output (2), and wherein a gear set element each planetary gear set (RS1, RS2, RS3, RSV) can be fixed or is fixed, characterized bythat the bottom bracket crankshaft (1) is connected to a planet gear carrier (8) of the second planetary gear set (RS2) and to a sun gear (10) of the third planetary gear set (RS3), that the rotor (16) of the electric machine (EM) is connected to the sun gear (4) of the first planetary gear set (RS1), that a ring gear (6) of the first planetary gear set (RS1) is fixed to the bottom bracket shell (3), that a ring gear (9) of the second planetary gear set (RS2) is fixed to the bottom bracket shell (3), that a ring gear (12) of the third planetary gear set (RS3) is fixed to the bottom bracket shell (3), and that a planet gear carrier (11) of the third planetary gear set (RS3) is connected to the output (2). [6] Bottom bracket gear according to claim 5, characterized bythat a first freewheel (F1) is provided between the bottom bracket crankshaft (1) and the sun gear (10) of the third planetary gear set (RS3), and / or that a second freewheel (F2) is provided between the planet gear carrier (8) of the second planetary gear set (2) and the sun gear (10) of the third planetary gear set (3) or between the planet gear carrier (5) of the first planetary gear set (RS1) and the sun gear (7) of the second planetary gear set (RS2) or between the rotor (16) of the electric machine (EM) and the sun gear (4) of the first planetary gear set (RS1) or between the ring gear (6) of the first planetary gear set (RS1) and the bottom bracket shell (3) or between the ring gear (9) of the second planetary gear set (RS2) and the bottom bracket shell (3). [7] Bottom bracket gear in planetary design for a pedelec, with a bottom bracket crankshaft (1) and with three planetary gear sets (RS1, RS2, RS3, RSV) and with an electric machine (EM), wherein the planetary gear sets (RS1, RS2, RS3, RSV) and the electric machine (EM) are arranged coaxially to the bottom bracket crankshaft (1), wherein a sun gear (4) as input of a first planetary gear set (RS1) is connectable or connected to a rotor (16) of the electric machine (EM), wherein a planet gear carrier (5) as output of the first planetary gear set (RS1) is connectable or connected to a sun gear (7) as input of the second planetary gear set (RS2), wherein a gear set element as output of the second planetary gear set (RS2) and / or of a front-mounted planetary gear set (RSV) or of a third planetary gear set (RS3) is connectable or connected to an output (2), and wherein a gear set element each planetary gear set (RS1, RS2, RS3, RSV) can be fixed or is fixed, characterized bythat the bottom bracket crankshaft (1) is connected to a planet gear carrier (14) of the primary planetary gear set (RSV), that a ring gear (15) of the primary planetary gear set (RSV) is connected to the output (2), that a sun gear (13) of the primary planetary gear set (RSV) is fixed to the bottom bracket shell (3), that the rotor (16) of the electric machine (EM) is connected to the sun gear (4) of the first planetary gear set (RS1), that a ring gear (6) of the first planetary gear set (RS1) is fixed to the bottom bracket shell (3), that a ring gear (9) of the second planetary gear set (RS2) is fixed to the bottom bracket shell (3), that a planet gear carrier (8) of the second planetary gear set (RS2) is connected to the output (2). [8] Bottom bracket gear according to claim 7, characterized bythat a first freewheel (F1) is provided between the bottom bracket crankshaft (1) and the planetary gear carrier (14) of the primary planetary gear set (RSV) or between the output (2) and the ring gear (15) of the primary planetary gear set (RSV) or between the bottom bracket shell (3) and the sun gear (13) of the primary planetary gear set (RSV), and / or that a second freewheel (F2) is provided between the planetary gear carrier (8) of the second planetary gear set (2) and the ring gear (15) of the primary planetary gear set (RSV) or between the planetary gear carrier (5) of the first planetary gear set (RS1) and the sun gear (7) of the second planetary gear set (RS2) or between the rotor (16) of the electric machine (EM) and the sun gear (4) of the first planetary gear set (RS1) or between the ring gear (6) of the first planetary gear set (RS1) and the bottom bracket shell (3) or between the ring gear (9) of the second planetary gear set (RS2) and the bottom bracket shell (3). [9] Pedelec with a bottom bracket gear according to one of the preceding claims.

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