Planetary bottom bracket gearbox for a bicycle or e-bike

Abstract

A planetary bottom bracket gearbox for a bicycle or pedelec (1) is proposed, comprising a crankshaft (WAn) as the input and a gearbox output shaft (WAb) as the output, and further shafts (W1, W2, W3, W4, W5, W6, W7), as well as a first gearbox shift group (3) and a second gearbox shift group (4), which are coupled to each other to implement several gears (G1, G2, G3, G4, G5, G6, G7, G8, G9, G10, G11, G12), wherein the first gearbox shift group (3) comprises a two-stage stepped planetary gear set (StRS1). Furthermore, a bicycle or pedelec (1) with a bottom bracket gearbox is proposed.

Description

[0001] The present invention relates to a planetary bottom bracket gear for a bicycle or pedelec, comprising a transmission input shaft or pedal crankshaft as the input and a transmission output shaft as the output, as well as further shafts, a first transmission shifting group with a stepped planetary gear set and a second transmission shifting group, to which several shifting elements are assigned. Furthermore, the invention relates to a bicycle or pedelec with the bottom bracket gear.

[0002] For example, from publication DE 10 2022 203 243 B3, a transmission in a pedal crankcase for a bicycle or pedelec is known. The transmission comprises a stepped planetary gear set and another planetary gear set, which are arranged coaxially with the pedal crankshaft and are assigned six shifting elements to realize six gears.

[0003] DE 10 2022 207 397 B3 relates to a planetary bottom bracket transmission for a bicycle with a pedal crankshaft as the input and a transmission output shaft as the output. The transmission comprises at least five additional shafts, two coaxially arranged stepped planetary gear sets, and six shifting elements for implementing nine gears, with the gear sets and shifting elements being interconnected.

[0004] DE 10 2022 207 394 B3 relates to a planetary bottom bracket transmission for a bicycle with a pedal crankshaft as the input and a transmission output shaft as the output. The transmission comprises at least five additional shafts, two coaxially arranged stepped planetary gear sets, and six shifting elements for implementing nine gears, with the gear sets and shifting elements being interconnected.

[0005] DE 10 2022 207 261 B3 relates to a planetary bottom bracket transmission for a bicycle with a pedal crankshaft as the input and a transmission output shaft as the output, as well as at least six additional shafts and two coaxially arranged stepped planetary gear sets. It comprises at least six shifting elements for implementing eight gears, with the pedal crankshaft and the transmission output shaft being connected to each other via various gear sets and shafts.

[0006] The present invention is based on the object of proposing a bottom bracket gear and a bicycle or pedelec with the bottom bracket gear, which have the lowest possible construction effort with improved properties compared to the prior art.

[0007] This object is achieved according to the invention by the subject matter having the features of patent claims 1 and 17, respectively. Advantageous and claimed developments emerge from the subclaims and the description as well as the drawings.

[0008] Thus, a planetary bottom bracket gear for a bicycle or pedelec is proposed. The bottom bracket gear comprises a crankshaft as the input and a transmission output shaft as the output, as well as additional shafts, with the output preferably being provided via a sprocket, a belt pulley, or the like.Furthermore, the bottom bracket transmission comprises a first gear shift group and a second gear shift group, which are coupled to one another to realize a plurality of gears, wherein the first gear shift group comprises a two-stage stepped planetary gear set, to which three shifting elements are assigned, wherein a first shaft as the input shaft of the first stepped planetary gear set is connected to a second ring gear as an element of the first stepped planetary gear set, wherein a fifth shaft as the output shaft of the first stepped planetary gear set is connected to a first ring gear as an element of the first stepped planetary gear set, wherein a second sun gear as an element of the first stepped planetary gear set is connected to a housing orcan be fixed to a stationary component or the like, wherein a first sun gear as an element of the first stepped planetary gear set can be fixed to the housing via a second switching element, wherein a stepped planetary gear carrier is rotatably mounted as an element of the first stepped planetary gear set, and wherein, in order to block the stepped planetary gear set, two elements of the first stepped planetary gear set can be connected to one another via a fifth switching element, so that theoretically ten blocking variants with the same effect are possible.

[0009] In this way, the above-described connection of the first gear shift group in the proposed bottom bracket transmission with a stepped planetary gear set and only three shifting elements achieves a particularly simple and compact design for the bottom bracket transmission. In addition, the geometric gear ratios of the bottom bracket transmission provide particularly low component loads and an advantageously high gear efficiency compared to the known transmission.

[0010] For the mechanical connection of elements, for example rotating elements or the like of the two planetary gear sets in the two transmission shift groups, in addition to the input and output, further 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 general connecting elements that connect the individual gear set elements to one another for torque transmission.

[0011] The axial order of the two gear shift groups can be reversed in the proposed bottom bracket transmission. Accordingly, the first gear shift group is positioned between the transmission input shaft or crankshaft and the transmission output shaft of the bottom bracket transmission, either upstream or downstream of the second gear shift group. With an upstream arrangement of the first gear shift group, a crank of the bottom bracket transmission, connected to the transmission input shaft or crankshaft, is connected to the first shaft, essentially acting as the input shaft of the first gear shift group, and the fifth shaft of the first gear shift group is connected to the input side of the second gear shift group. The crankshaft and the first shaft can be constructed as one or more parts.In a downstream arrangement of the first transmission shift group, the first shaft is connected to the second transmission shift group on the output side, and the fifth shaft of the first transmission shift group is connected to the transmission output shaft. The transmission output shaft and the fifth shaft can be designed as one or more parts.

[0012] In the proposed bottom bracket gear system, a multi-speed second gear group of any design can be combined with the first gear group as a bottom bracket gear system. Preferably, the second gear group can be designed as a two-speed gearbox or two-speed group, or as a three-speed gearbox or three-speed group, or as a four-speed gearbox or four-speed group, and the first gear group can be designed as a three-speed gearbox or three-speed group, so that, for example, a six-speed gearbox, nine-speed gearbox, ten-speed gearbox, or twelve-speed gearbox is implemented as the bottom bracket gear system. However, different numbers of gears can also be implemented in the gear group systems, so that the bottom bracket gear system can also implement more or fewer gears. Depending on the boundary conditions and requirements of the bottom bracket gear system, gears can also be omitted. In this way, the gear set can be adapted to the required gear ratios (gear steps, gear ratio spread, etc.).) or also to the type of circuits, how many switching elements are involved.

[0013] To connect the second gear shifting group, in order to achieve a particularly simple and compact design of the bottom bracket transmission, it can be provided that the second gear shifting group comprises a first planetary gear set to which a third shifting element and a sixth shifting element are assigned, wherein in the second gear shifting group a second element of the first planetary gear set is connected to the pedal crankshaft or to the fifth shaft as the output shaft of the first stepped planetary gear set, wherein a first element of the first planetary gear set can be fixed to the housing via the third shifting element, wherein a third element of the first planetary gear set is connected to the transmission output shaft or to the first shaft as the input shaft of the first stepped planetary gear set, and wherein, in order to block the first planetary gear set, two elements of the first planetary gear set can be connected to one another via the sixth shifting element.

[0014] A possible embodiment of the invention can provide for the connection of the second gear shift group to achieve a particularly simple and compact design of the bottom bracket transmission, wherein the second gear shift group comprises a first planetary gear set and a second planetary gear set, to which a third shifting element, a fourth shifting element and a sixth shifting element are assigned, wherein in the second gear shift group, a second element of the first planetary gear set is connected to the pedal crankshaft or to the fifth shaft as the output shaft of the first stepped planetary gear set, wherein a first element of the first planetary gear set and a first element of the second planetary gear set are connected to the transmission output shaft or to the first shaft as the input shaft of the first stepped planetary gear set, wherein a third element of the first planetary gear set can be fixed to the housing via the third shifting element,wherein the third element of the first planetary gear set is connected to a second element of the second planetary gear set, wherein a third element of the second planetary gear set can be fixed to the housing via the fourth shifting element, and wherein, for blocking the first planetary gear set and the second planetary gear set, two elements of the planetary gear sets can be connected to one another via the sixth shifting element.

[0015] A next embodiment of the invention can provide for the connection of the second gear shift group to achieve a particularly simple and compact design of the bottom bracket transmission, wherein the second gear shift group comprises a second stepped planetary gear set, to which a third shifting element, a fourth shifting element and a sixth shifting element are assigned, wherein in the second gear shift group, a second ring gear as an element of the second stepped planetary gear set is connected to the pedal crankshaft or to the fifth shaft as the output shaft of the first stepped planetary gear set, wherein a second ring gear as an element of the second stepped planetary gear set is connected to the transmission output shaft or to the first shaft as the input shaft of the first stepped planetary gear set, wherein the stepped planetary gear carrier as an element of the second stepped planetary gear set can be fixed to the housing via the third shifting element,wherein a sun gear as an element of the second stepped planetary gear set can be fixed to the housing via the fourth shifting element, and wherein, in order to block the second stepped planetary gear set, two elements of the second stepped planetary gear set can be connected to one another via the sixth shifting element.

[0016] A further embodiment of the invention can provide for the connection of the second gear shift group to achieve a particularly simple and compact design of the bottom bracket transmission, wherein the second gear shift group comprises a first planetary gear set and a second planetary gear set, to which a third shifting element, a fourth shifting element, a sixth shifting element and a seventh shifting element are assigned, wherein in the second gear shift group, a second element of the first planetary gear set is connected to the pedal crankshaft or to the fifth shaft as the output shaft of the first stepped planetary gear set, wherein a first element of the first planetary gear set is connected to the transmission output shaft or to the first shaft as the input shaft of the first stepped planetary gear set, wherein a third element of the first planetary gear set is connected to a second element of the second planetary gear set,wherein a third element of the second planetary gear set is fixable to the housing via the third shifting element and is connectable to the pedal crankshaft or to the fifth shaft as the output shaft of the first stepped planetary gear set via the sixth shifting element, and wherein a first element of the second planetary gear set is fixable to the housing via the fourth shifting element and is connectable to the transmission output shaft or to the first shaft as the input shaft of the first stepped planetary gear set via the seventh shifting element.

[0017] In addition, a further embodiment of the invention for connecting the second gear shifting group to achieve a particularly simple and compact design of the bottom bracket transmission can provide that the second gear shifting group comprises a first two-speed group and a second two-speed group, wherein the third shifting element and the sixth shifting element are assigned to the first two-speed group, and wherein the fourth shifting element and the seventh shifting element are assigned to the second two-speed group. Furthermore, it is provided that, in the first two-speed group, a second element of the first planetary gear set is connected to the pedal crankshaft or to the fifth shaft as the output shaft of the first stepped planetary gear set, that a third element of the first planetary gear set is connected to a second element of the second planetary gear set, that a first element of the first planetary gear set can be fixed to the housing via the third shifting element,To lock the first planetary gear set, two elements of the first planetary gear set can be connected to one another via the sixth shifting element; a first element of the second planetary gear set is connected to the transmission output shaft or to the first shaft as the input shaft of the first stepped planetary gear set; a third element of the second planetary gear set can be fixed to the housing via the fourth shifting element; and to lock the second planetary gear set, two elements of the second planetary gear set can be connected to one another via the seventh shifting element. In addition to interchanging the order of the two transmission shifting groups, it is also possible to interchange the two two-speed groups, quasi in the direction of power flow or in the axial direction.

[0018] Within the scope of the invention, the proposed bottom bracket transmission with the two gear shift groups provides that the provided shifting elements can be designed as brakes, freewheel brakes, clutches, and / or freewheels. An advantageous embodiment of the invention provides that the first shifting element, the second shifting element, the third shifting element, and the fourth shifting element are each designed as a positive-locking brake, and / or that the fifth shifting element, the sixth shifting element, and the seventh shifting element are each designed as a freewheel.

[0019] The switching elements designed as brakes are preferably designed as positive-locking switching elements, for example as cost-effective brake or switching dogs or the like, for example with a toothed brake ring and a corresponding switching pawl. Brakes as switching elements have the advantage that they are easily accessible for operation from the outside. In the case of clutches designed as freewheels, it is advantageous if the brakes are designed, for example, as one-way brakes in order to prevent the gear from jamming when the direction of rotation at the input or output is reversed. Freewheels that cannot be actively switched or actuated are preferably used as freewheels. This has the advantage that no switching operation is required for the passive switching elements. The non-actuable freewheel transmits a torque when it is locked in the blocking direction.No torque is transmitted in the opposite direction of rotation, as the freewheel does not lock in the overrunning drive state. However, it is conceivable that actively switchable freewheels or actively switchable freewheel brakes could also be used.

[0020] A preferred embodiment of the invention can provide for at least one of the planetary gear sets to be designed as a negative planetary gear set, resulting in a particularly space-efficient arrangement. It is also conceivable for one of the planetary gear sets to be designed as a positive planetary gear set.

[0021] A negative planetary gear set can preferably be converted into a positive planetary gear set if the planet carrier and ring gear connections on this gear set are swapped and the amount of the stationary gear ratio is increased by 1. A negative planetary gear set has rotatably mounted planet gears on its planet 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 when the planet carrier is held stationary 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 gear set meshing with the inner planetary gears and the ring gear of this planetary gear set meshing with the outer planetary gears, so that the ring gear rotates in the same direction of rotation as the sun gear when the planetary gear carrier is held stationary and the sun gear is rotating.

[0022] For those skilled in the art, this means that in the case of single gear sets designed as a negative planetary gear set, a first element or gear set element is designed as a sun gear, a second element as a planetary gear carrier or web, and a third element as a ring gear. Furthermore, this means that in a single gear set designed as a positive 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 web.

[0023] 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.

[0024] To electrically assist the drive in the proposed bottom bracket transmission, at least one electric motor or the like can be connected or connectable to the drive or to the pedal crankshaft or transmission input shaft and / or to the output or to the transmission output shaft, or can be permanently or detachably coupled. Preferably, the electric motor can be arranged axially parallel to the pedal crankshaft or transmission input shaft, while the planetary gear sets are arranged coaxially to the pedal crankshaft or transmission input shaft.

[0025] 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 further advantages.

[0026] The present invention is further explained below with reference to the drawings.

[0027] They show: Fig. 1 a schematic principle view of a bottom bracket gear according to the invention on a bicycle or a pedelec with a first gear shift group connected upstream of a second gear shift group with a stepped planetary gear set with a first blocking variant; Fig. 2 a schematic principle view of the bottom bracket transmission according to the invention with the first transmission group connected downstream of the second transmission group with the stepped planetary gear set with a first blocking variant; Fig. 3 a schematic principle view of the bottom bracket transmission according to the invention with the first transmission group connected upstream of the second transmission group with the stepped planetary gear set with a second blocking variant; Fig. 4 a schematic principle view of the bottom bracket transmission according to the invention with the first transmission group connected upstream of the second transmission group with the stepped planetary gear set with a third blocking variant; Fig. 5 a schematic principle view of the bottom bracket transmission according to the invention with the first transmission group connected upstream of the second transmission group with the stepped planetary gear set with a fourth blocking variant; Fig. 6 a schematic principle view of the bottom bracket transmission according to the invention with the first transmission group connected upstream of the second transmission group with the stepped planetary gear set with a fifth blocking variant; Fig. 7 a schematic principle view of the bottom bracket transmission according to the invention with the first transmission group connected upstream of the second transmission group with the stepped planetary gear set with a sixth blocking variant; Fig. 8 a schematic principle view of the bottom bracket transmission according to the invention with the first transmission group connected upstream of the second transmission group with the stepped planetary gear set with a seventh blocking variant; Fig. 9 a schematic principle view of the bottom bracket transmission according to the invention with the first transmission group connected upstream of the second transmission group with the stepped planetary gear set with an eighth blocking variant; Fig. 10 a shifting diagram with three shiftable gears of the first gear shift group in the bottom bracket gearbox; Fig. 11 a schematic principle view of the bottom bracket transmission with an embodiment of the second transmission group as a two-speed transmission, which is connected upstream of the first transmission group as a three-speed transmission; Fig. 12 a switching diagram of the six-speed bottom bracket gearbox according to the Fig. 11; Fig. 13 a schematic principle view of the bottom bracket transmission with an embodiment of the second transmission group with two planetary gear sets arranged downstream of the first transmission group as a three-speed transmission; Fig. 14 a schematic principle view of the bottom bracket transmission with an embodiment of the second transmission group connected downstream of the first transmission group as a three-speed transmission with a second stepped planetary gear set; Fig. 15 a shifting diagram of the nine-speed bottom bracket gearbox according to the Fig. 13 and Fig. 14; Fig. 16 a schematic principle view of the bottom bracket transmission with an embodiment of the second transmission group with two planetary gear sets arranged downstream of the first transmission group as a three-speed transmission; Fig. 17 a switching diagram of the ten-speed bottom bracket gear according to the Fig. 17; Fig. 18 a schematic principle view of the bottom bracket transmission with an embodiment of the second transmission group with two two-speed groups connected downstream of the first transmission group as a three-speed transmission; Fig. 19 a shifting diagram of the twelve-speed bottom bracket gear according to the Fig. 18; Fig. 20 a schematic principle view of the bottom bracket gear according to Fig. 1 with an exemplary torque sensor on the drive; Fig. 21 a schematic principle view of the bottom bracket gear according to Fig. 20 with an electric machine arranged on the drive as an example; Fig. 22 a schematic diagram of the bottom bracket gear according to Fig. 20 with an electric machine arranged as an example at the output; and Fig. 23 a schematic diagram of the bottom bracket gear according to Fig. 20 with a freewheel in front of the crankshaft.

[0028] In the Fig. 1 to 23, various design variants and embodiments or switching schemes of a bottom bracket gear according to the invention in planetary design are shown merely by way of example. Fig. 1 shows an example of a bicycle or pedelec 1 with the bottom bracket gear, only schematically indicated.

[0029] The bottom bracket gear is shown in a housing or bottom bracket shell 2 with a pedal crank with pedals as the pedal crankshaft WAn, wherein the pedal crankshaft WAn is connected on the input side to one of the gear shift groups 3, 4. Furthermore, the bottom bracket gear comprises a gear output shaft WAb as the output with a chain or belt wheel (not shown in detail), which is connected on the output side to one of the gear shift groups 3, 4. The bottom bracket gear comprises a multi-speed first gear shift group 3 and a multi-speed second gear shift group 4, wherein the first gear shift group 3 has a two-stage stepped planetary gear set StRS1, to which a first shifting element B1 as a positive-locking brake, a second shifting element B2 as a positive-locking brake, and a fifth shifting element F1 I , F1 II , F1 III , F1 IV , F1 V , F1 VI , F1 VII , F1 VIIIare assigned as a freewheel. The two gearshift groups 3, 4 essentially form two sub-gearboxes that can be interconnected in any order with respect to the direction of power flow between the pedal crankshaft WAn and the transmission output shaft WAb.

[0030] Regardless of the respective design variants, the bottom bracket gear is provided with a first shaft W1 as the input shaft of the first stepped planetary gear set StRS1 being connected to a second ring gear HR1.2 as an element of the first stepped planetary gear set StRS1, a fifth shaft W5 as the output shaft of the first stepped planetary gear set StRS1 being connected to a first ring gear HR1.1 as an element of the first stepped planetary gear set StRS1, a second sun gear SR1.2 as an element of the first stepped planetary gear set StRS1 being able to be fixed to a housing 2 via the first shifting element B1, and a first sun gear SR1.1 as an element of the first stepped planetary gear set StRS1 can be fixed to the housing 2 via the second switching element B2, that a stepped planetary gear carrier SPT1 is rotatably mounted as an element of the first stepped planetary gear set StRS1, and that for blocking the stepped planetary gear set StRS1 two elements of the first stepped planetary gear set StRS1 via the fifth switching element F1. I , F1 II , F1 III , F1 IV , F1 V , F1 VI , F1 VII , F1 VIII can be connected to each other.

[0031] In the Fig. 11, Fig. 13, Fig. 14, Fig. 16 and Fig. 18, the proposed planetary gear sets RS1, RS2 are each designed as space-efficient negative planetary gear sets. The first element of the planetary gear sets RS1, RS2 is a sun gear SR1, SR2, the second element is a carrier or planetary gear carrier PT1, PT2, and the third element is a ring gear HR1, HR2.

[0032] In Fig. 1 shows a variant of the bottom bracket transmission in which the first gear shift group 3 is connected upstream of the second gear shift group 4. In detail, the first variant according to Fig. 1 provided that the first shaft W1 as the input shaft of the first stepped planetary gear set StRS1 of the first transmission shift group 3 is connected to the pedal crankshaft WAn or is formed in one piece with it, that the first shaft W1 is connected to the second ring gear HR1.2 of the first stepped planetary gear set StRS1, that the first ring gear HR1.1 of the first stepped planetary gear set StRS1 is connected on the input side to the second transmission shift group 4 via the fifth shaft W5, that the stepped planetary gear carrier SPT1 of the first stepped planetary gear set StRS1 is rotatably mounted via a fourth shaft W4, that the second sun gear SR1.2 of the first stepped planetary gear set StRS1 can be fixed to the housing 2 via a second shaft W2 when the first shift element B1 is closed, that the first sun gear SR1.1 of the first stepped planetary gear set StRS1 can be fixed to the housing 2 via a third shaft W3 when the second shifting element B2 is closed, and that for blocking the first stepped planetary gear set StRS1 as a first blocking variant the first sun gear SR1.1 when the fifth shifting element F1 is locked. I in a first arrangement variant of the fifth switching element F1 I can be connected to the first ring gear HR1.1.

[0033] In Fig. 2 shows a variant of the bottom bracket gear, in which the first gear shift group 3 is connected downstream of the second gear shift group 4. In detail, the variant according to Fig. 2 provided that the first shaft W1 as the input shaft of the first stepped planetary gear set StRS1 is connected on the output side to the second transmission shift group 4, that the first shaft W1 is connected to the second ring gear HR1.2 of the first stepped planetary gear set StRS1, that the first ring gear HR1.1 of the first stepped planetary gear set StRS1 is connected to the fifth shaft W5, that the fifth shaft W5 as the output shaft of the first transmission shift group is connected to the transmission output shaft WAb or is formed integrally therewith, that the stepped planetary gear carrier SPT1 of the first stepped planetary gear set StRS1 is rotatably mounted via the fourth shaft W4, that the second sun gear SR1.2 of the first stepped planetary gear set StRS1 can be fixed to the housing 2 via the second shaft W2 when the first shift element B1 is closed, that the first sun gear SR1.1 of the first stepped planetary gear set StRS1 can be fixed to the housing 2 via the third shaft W3 when the second shifting element B2 is closed, and that for blocking the first stepped planetary gear set StRS1 as a first blocking variant the first sun gear SR1.1 when the fifth shifting element F1 is locked. I in a first arrangement variant of the fifth switching element F1 I can be connected to the first ring gear HR1.1.

[0034] In Fig. 3 shows a second blocking variant of the first stepped planetary gear set StRS1 in the first transmission group 3 connected upstream of the second transmission group 4. In the second blocking variant, when the fifth switching element F1 is closed, II In a second arrangement variant, the second sun gear SR1.2 is connected to the second ring gear HR1.2 of the first stepped planetary gear set StR1.

[0035] In Fig. 4 shows a third blocking variant of the first stepped planetary gear set StRS1 in the first transmission group 3 which is connected upstream of the second transmission group 4. In the third blocking variant, when the fifth switching element F1 is closed, III In a third arrangement variant, the stepped planetary gear carrier SPT1 is connected to the second ring gear HR1.2 of the first stepped planetary gear set StR1.

[0036] In Fig. 5 shows a fourth blocking variant of the first stepped planetary gear set StRS1 in the first transmission group 3 which is connected upstream of the second transmission group 4. In the fourth blocking variant, when the fifth switching element F1 is closed, IV In a fourth arrangement variant, the first ring gear HR1.1 is connected to the second ring gear HR1.2 of the first stepped planetary gear set StR1.

[0037] In Fig. 6 shows a fifth blocking variant of the first stepped planetary gear set StRS1 in the first transmission group 3 connected upstream of the second transmission group 4. In the fifth blocking variant, when the fifth switching element F1 is closed, V In a fifth arrangement variant, the first sun gear SR1.1 is connected to the second sun gear SR1.2 of the first stepped planetary gear set StR1.

[0038] In Fig. Figure 7 shows a sixth blocking variant of the first stepped planetary gear set StRS1 in the first transmission group 3 which is connected upstream of the second transmission group 4. Within the scope of the sixth blocking variant, when the fifth switching element F1 is closed, VI In a sixth arrangement variant, the second sun gear SR1.2 is connected to the stepped planetary gear carrier SPT1 of the first stepped planetary gear set StR1.

[0039] In Fig. Figure 8 shows a seventh blocking variant of the first stepped planetary gear set StRS1 in the first transmission group 3 which is connected upstream of the second transmission group 4. Within the framework of the seventh blocking variant, when the fifth switching element F1 is closed, VII In a seventh arrangement variant, the first sun gear SR1.1 is connected to the stepped planetary gear carrier SPT1 of the first stepped planetary gear set StR1.

[0040] In Fig. Figure 9 shows an eighth blocking variant of the first stepped planetary gear set StRS1 in the first transmission group 3, which is connected upstream of the second transmission group 4. In the eighth blocking variant, when the fifth switching element F1 is closed, VIII In an eighth arrangement variant, the first ring gear HR1.1 is connected to the stepped planetary gear carrier SPT1 of the first stepped planetary gear set StR1.

[0041] In Fig. Figure 10 shows a shift diagram for the first gear shift group 3 as a three-speed transmission. This shows that three gears G1, G2, and G3 can be realized by the first gear shift group 3. The shift diagram shows the shift elements B1, B2, and F1 used for the respective gears G1, G2, and G3. I , F1 II , F1 III , F1 IV , F1 V , F1 VI , F1 VII , F1 VIII Here, an X in the freewheel F1 means I , F1 II , F1 III , F1 IV , F1 V , F1 VI , F1 VII , F1 VIII as a switching element in the circuit diagram that locks the freewheel. This works automatically without external activation. Furthermore, an X for a brake B1, B2 as a switching element in the circuit diagram means that the brake B1, B2 is closed. This works via a suitable actuator. An empty field for the freewheel F1 I , F1 II , F1 III, F1 IV , F1 V , F1 VI ,F1 VII F1 VIII means it is not locked. An empty field for brakes B1 and B2 means they are open.

[0042] In detail, the circuit diagram according to Fig. 10, that to realize or switch a first gear G1, the first switching element F1 designed as a freewheel I , F1 II , F1 III , F1 IV , F1 V , F1 VI , F1 VII , F1 VIII locks that in order to realize a second gear G2 the second switching element B2 designed as a brake is closed, and / or that in order to realize a third gear G3 the first switching element B1 designed as a brake is closed.

[0043] In Fig. 11, the bottom bracket transmission is shown by way of example with a first transmission group 3 as a three-speed transmission group and with a second transmission group 4 as a two-speed transmission group with a first planetary gear set RS1, to which a third switching element B3 as a brake and a sixth switching element F2 as a freewheel are assigned.In detail, in order to connect the second transmission shift group 4 to the first transmission shift group 3, the planet gear carrier PT1 of the first planetary gear set RS1 is connected to the fifth shaft W5 as the output shaft of the first stepped planetary gear set StRS1, the sun gear SR1 of the first planetary gear set RS1 can be fixed to the housing 2 via a sixth shaft W6 when the third shift element B3 is closed, the ring gear HR1 of the first planetary gear set RS1 is connected to the transmission output shaft WAb, and in order to block the first planetary gear set RS1 in a first blocking variant, the ring gear HR1 can be connected to the sun gear of the first planetary gear set RS1 when the sixth shift element F2 is blocked. The two further blocking variants are implemented through the further connection options for the elements of the first planetary gear set RS1.The connections of the first stepped planetary gear set StRS1 in the first transmission shift group 3 have already been described above.

[0044] In Fig. 12 is a circuit diagram for the Fig. The bottom bracket transmission shown in Figure 11 is shown with the first gear group 3 as a three-speed transmission and with the second gear group 4 as a two-speed transmission. This results in 4 x 2, i.e., six gears G1, G2, G3, G4, G5, G6, being possible. The shifting diagram shows the shifting elements B1, B2, B3, F1 used for the respective gears G1, G2, G3, G4, G5, G6. I , F1 II , F1 III , F1 IV , F1 V , F1 VI , F1 VII , F1 VIII , F2. An X for the freewheels F1 I , F1 II , F1 III , F1 IV , F1 V , F1 VI , F1 VII , F1 VIII, F2 as switching elements in the circuit diagram that lock the freewheels. This works automatically without external activation. Furthermore, an X for a brake B1, B2, B3 as a switching element in the circuit diagram means that the brakes B1, B2, B3 are closed. This works via a suitable actuator. An empty field for the freewheels F1 I , F1 II , F1 III , F1 IV IV , F1 V , F1 VI , F1 VII , F1 VIII F2 means they are not locked. An empty field for brakes B1, B2, and B3 means they are open.

[0045] In detail, the circuit diagram according to Fig. 12, that to realize or switch a first gear G1, the fifth switching element F1 designed as a freewheel I , F1 II , F1 III , F1 IV , F1 V , F1 VI , F1 VII , F1 VIIIand block the sixth switching element F2 designed as a freewheel, that in order to realize a second gear G2 the second switching element B2 designed as a brake is closed and that sixth switching element F2 designed as a freewheel blocks, that in order to realize a third gear G3 the first switching element B1 designed as a brake is closed and the sixth switching element F2 designed as a freewheel blocks, that in order to realize a fourth gear G4 the third switching element B3 designed as a brake is closed and the fifth switching element F1 designed as a freewheel I , F1 II , F1 III , F1 IV , F1 V , F1 VI , F1 VII , F1 VIIIlocks that in order to realize a fifth gear G5 the second switching element B2 designed as a brake and the third switching element B3 designed as a brake are closed, and / or that in order to realize a sixth gear G6 the first switching element B1 designed as a brake and the third switching element B3 designed as a brake are closed.

[0046] In Fig. 13, the bottom bracket transmission is shown by way of example with a first gear shift group 3 as a three-speed transmission group and with a second gear shift group 4 as a three-speed transmission group with a first planetary gear set RS1 and a second planetary gear set RS2, to which a third shifting element B3 as a brake, a fourth shifting element B4 as a brake, and a sixth shifting element F2 as a freewheel are assigned. In detail, for connecting the second gear shift group 4 to the first gear shift group 3, the planetary gear carrier PT1 of the first planetary gear set RS1 is connected to the fifth shaft W5 as the output shaft of the first stepped planetary gear set StRS1, the sun gear SR1 of the first planetary gear set RS1 and the sun gear SR2 of the second planetary gear set RS2 are jointly connected to the transmission output shaft WAb,that the ring gear HR1 of the first planetary gear set RS1 can be fixed to the housing 2 via a sixth shaft W6 when the third shifting element B3 is closed, that the ring gear HR1 of the first planetary gear set RS1 is fixedly connected to the planet carrier PT2 of the second planetary gear set RS2 via the sixth shaft W6, that the ring gear HR2 of the second planetary gear set RS2 can be fixed to the housing 2 via a seventh shaft W7 when the fourth shifting element B4 is closed,and that, in order to interlock the first planetary gear set RS1 and the second planetary gear set RS2 within the framework of a first interlocking variant, the transmission output shaft WAb connected to the two sun gears SR1 and SR2 of the two planetary gear sets RS1 and RS2 can be connected, with the sixth shift element F2 locked, in a first arrangement variant to the seventh shaft W7 connected to the ring gear HR2 of the second planetary gear set RS2. To implement the further interlocking variants, further of the six elements of the two planetary gear sets RS1, RS2 are connected to one another via the sixth shift element F2. The connections of the first stepped planetary gear set StRS1 in the first transmission shift group 3 have already been described above.

[0047] In Fig. 14, the bottom bracket transmission is shown by way of example with a first gear shift group 3 as a three-speed gear shift group and with a second gear shift group 4 as a three-speed gear shift group with a second stepped planetary gear set StRS2, to which a third shift element B3 as a brake, a fourth shift element B4 as a brake and a sixth shift element F2 as a freewheel are assigned. In detail, in order to connect the second gear shift group 4 to the first gear shift group 3, the second ring gear HR2.2 as an element of the second stepped planetary gear set StRS2 is connected to the fifth shaft W5 as the output shaft of the first stepped planetary gear set StRS1, and the first ring gear HR2.1 as an element of the second stepped planetary gear set StRS2 is connected to the transmission output shaft WAb, that the stepped planetary gear carrier SPT2 as an element of the second stepped planetary gear set StRS2 can be fixed to the housing 2 via a sixth shaft W6 when the third shifting element B3 is closed, that the sun gear SR2.1 as an element of the second stepped planetary gear set StRS2 can be fixed to the housing 2 via a seventh shaft W7 when the fourth shifting element B4 is closed, and that in order to block the second stepped planetary gear set StRS2 within the framework of a first blocking variant, the sun gear SR2.1 can be connected to the first ring gear HR2.1 of the second stepped planetary gear set StRS2 in a first arrangement variant when the sixth shifting element F2 is blocked. The further blocking variants are realized by the further connection options of the four elements of the second stepped planetary gear set StRS2.The connections of the first stepped planetary gear set StRS1 in the first transmission shift group 3 have already been described above.

[0048] In Fig. 15 is a circuit diagram for the Fig. 13 and Fig. The bottom bracket transmission shown in Figure 14 is shown with the first gear group 3 as a three-speed transmission and with the second gear group 4 as a three-speed transmission. This results in 3 x 3, i.e. nine gears G1, G2, G3, G4, G5, G6, G7, G8, G9, being possible. In the shift diagram, the shift elements B1, B2, B3, B4, F1 used for the respective gears G1, G2, G3, G4, G5, G6, G7, G8, G9 are shown. I , F1 II , F1 III , F1 IV , F1 V , F1 VI , F1 VII , F1 VIII , F2. An X for the freewheels F1 I , F1 II , F1 III , F1 IV , F1 V , F1 VI , F1 VII , F1 VIII, F2 as switching elements in the circuit diagram that lock the freewheels. This works automatically without external activation. Furthermore, an X for a brake B1, B2, B3, B4 as a switching element in the circuit diagram means that the brakes B1, B2, B3, B4 are closed. This works via a suitable actuator. An empty field for the freewheels F1 I , F1 II , F1 III , F1 IV , F1 V , F1 VI , F1 VII , F1 VIII , F2 means they are not locked. An empty field for brakes B1, B2, B3, B4 means they are open.

[0049] In detail, the circuit diagram according to Fig. 15, that to realize or switch a first gear G1, the fifth switching element F1 designed as a freewheel I , F1 II , F1 III , F1 IV , F1 V , F1 VI , F1 VII , F1 VIIIand block the sixth switching element F2 designed as a freewheel, that in order to realize a second gear G2 the second switching element B2 designed as a brake is closed and blocks the sixth switching element F2 designed as a freewheel, that in order to realize a third gear G3 the first switching element B1 designed as a brake is closed and blocks the sixth switching element F2 designed as a freewheel, that in order to realize a fourth gear G4 the fourth switching element B4 designed as a brake is closed and the fifth switching element F1 designed as a freewheel I , F1 II , F1 III , F1 IV , F1 V , F1 VI , F1 VII , F1 VIIIlocks that to realize a fifth gear G5 the second switching element B2 designed as a brake and the fourth switching element B4 designed as a brake are closed, that to realize a sixth gear G6 the first switching element B1 designed as a brake and the fourth switching element B4 designed as a brake are closed, that to realize a seventh gear G7 the third switching element B3 designed as a brake is closed and the fifth switching element F1 designed as a freewheel I , F1 II , F1 III , F1 IV , F1 V , F1 VI , F1 VII , F1 VIIIlocks that in order to realize an eighth gear G8 the second switching element B2 designed as a brake and the third switching element B3 designed as a brake are closed, and / or that in order to realize a ninth gear G9 the first switching element B1 designed as a brake and the third switching element B3 designed as a brake are closed.

[0050] In Fig. 16, the bottom bracket transmission is shown by way of example with a first gear shift group 3 as a three-speed transmission group and with a second gear shift group 4 with a first planetary gear set RS1 and a second planetary gear set RS2, to which a third shifting element B3 as a brake, a fourth shifting element B4 as a brake, a sixth shifting element F2 as a freewheel, and a seventh shifting element F3 as a freewheel are assigned. In detail, for connecting the second gear shift group 4 to the first gear shift group 3, the planetary gear carrier PT1 of the first planetary gear set RS1 is connected to the fifth shaft W5 as the output shaft of the first stepped planetary gear set StRS1, the sun gear SR1 of the first planetary gear set RS1 is connected to the transmission output shaft WAb, and the ring gear HR1 of the first planetary gear set RS1 is fixedly connected to the planetary gear carrier PT2 of the second planetary gear set RS2 via a sixth shaft W6.that the ring gear HR2 of the second planetary gear set RS2 can be fixed to the housing 2 via a seventh shaft W7 when the third shifting element B3 is closed and can be connected to the fifth shaft W5 as the output shaft of the first stepped planetary gear set StRS1 when the sixth shifting element F2 is locked, and that the sun gear SR2 of the second planetary gear set RS2 can be fixed to the housing 2 via an eighth shaft W8 when the fourth shifting element B4 is closed and can be connected to the transmission output shaft WAb when the seventh shifting element F3 is locked. The connections of the first stepped planetary gear set StRS1 in the first transmission shift group 3 have already been described above.

[0051] In Fig. 17 is a circuit diagram for the Fig. The bottom bracket transmission shown in Figure 16 is shown with the first gear group 3 as a three-speed transmission and with the second gear group 4. This results in ten gears G1, G2, G3, G4, G5, G6, G7, G8, G9, G10 being possible. In the shift diagram, the shift elements B1, B2, B3, B4, F1 used for the respective gears G1, G2, G3, G4, G5, G6, G7, G8, G9, G10 are shown. I , F1 II , F1 III , F1 IV , F1 V , F1 VI , F1 VII , F1 VIII , F2, F3. An X for the freewheels F1 I , F1 II , F1 III , F1 IV , F1 V , F1 VI , F1 VII , F1 VIII, F2, F3 as switching elements in the circuit diagram that lock the freewheels. This works automatically without external activation. Furthermore, an X for a brake B1, B2, B3, B4 as a switching element in the circuit diagram means that the brakes B1, B2, B3, B4 are closed. This works via a suitable actuator. An empty field for the freewheels F1 I , F1 II , F1 III , F1 IV , F1 V , F1 VI , F1 VII , F1 VIII , F2, F3 means they are not locked. An empty field for brakes B1, B2, B3, B4 means they are open.

[0052] In detail, the circuit diagram according to Fig. 17, that to realize or switch a first gear G1, the fifth switching element F1 designed as a freewheel I , F1 II , F1 III , F1 IV , F1 V , F1 VI , F1 VII , F1 VIII, the sixth switching element F2 designed as a freewheel and the seventh switching element F3 designed as a freewheel lock, that in order to realize a second gear G2 the second switching element B2 designed as a brake is closed and the sixth switching element F2 designed as a freewheel and the seventh switching element F3 designed as a freewheel lock, that in order to realize a third gear G3 the first switching element B1 designed as a brake is closed and the sixth switching element F2 designed as a freewheel and the seventh switching element F3 designed as a freewheel lock, that in order to realize a fourth gear G4 the fourth switching element B4 designed as a brake is closed and the fifth switching element F1 designed as a freewheel I , F1 II , F1 III , F1 IV , F1 V , F1 VI , F1 VII , F1 VIIIand block the sixth switching element F2 designed as a freewheel, so that to realize a fifth gear G5 the third switching element B3 designed as a brake is closed and the fifth switching element F1 designed as a freewheel I , F1 II , F1 III , F1 IV , F1 V , F1 VI , F1 VII , F1 VIIIand block the seventh switching element F3 designed as a freewheel, that in order to realize a sixth gear G6 the second switching element B2 designed as a brake and the third switching element B3 designed as a brake are closed and the seventh switching element F3 designed as a freewheel blocks, that in order to realize a seventh gear G7 the first switching element B1 designed as a brake and the third switching element B3 designed as a brake are closed and the seventh switching element F3 designed as a freewheel blocks, that in order to realize an eighth gear G8 the third switching element B3 designed as a brake and the fourth switching element B4 designed as a brake are closed and the fifth switching element F1 designed as a freewheel I , F1 II , F1 III , F1 IV , F1 V , F1 VI , F1 VII , F1 VIIIlocks that in order to realize a ninth gear G9 the second switching element B2 designed as a brake, the third switching element B3 designed as a brake and the fourth switching element B4 designed as a brake are closed, and / or that in order to realize a tenth gear G10 the first switching element B1 designed as a brake, the third switching element B3 designed as a brake and the fourth switching element B4 designed as a brake are closed.

[0053] In Fig. 18, the bottom bracket transmission is shown by way of example with a first gear shift group 3 as a three-speed gear shift group and with a second gear shift group 4 as a first two-speed group and as a second two-speed group with a first planetary gear set RS1 and a second planetary gear set RS2, to which a third shifting element B3 as a brake, a fourth shifting element B4 as a brake, a sixth shifting element F2 as a freewheel, and a seventh shifting element F3 as a freewheel are assigned. In detail, for connecting the second gear shift group 4 to the first gear shift group 3, the planetary gear carrier PT1 of the first planetary gear set RS1 is connected to the fifth shaft W5 as the output shaft of the first stepped planetary gear set StRS1, the ring gear HR1 of the first planetary gear set RS1 is connected via a seventh shaft W7 to the planetary gear carrier PT2 of the second planetary gear set RS2,that the sun gear SR1 of the first planetary gear set RS1 can be fixed to the housing 2 via a sixth shaft W6 when the third shifting element B3 is closed, that for blocking the first planetary gear set RS1 within the framework of a first blocking variant, the sun gear SR1 can be connected to the ring gear HR1 of the first planetary gear set RS1 with the sixth shifting element F2 locked in a first arrangement variant, wherein the further blocking variants are realized by using the other elements in the first planetary gear set RS1 via the sixth shifting element F2, that in the second two-speed group, the sun gear SR2 of the second planetary gear set RS2 is connected to the transmission output shaft WAb, that the ring gear HR3 of the second planetary gear set RS2 can be fixed to the housing 2 via an eighth shaft W8 when the fourth shifting element B4 is closed,and that, for locking the second planetary gear set RS2 within the framework of a first locking variant, the sun gear SR2 can be connected to the ring gear HR2 of the second planetary gear set R2 when the seventh shift element F3 is locked, in a first arrangement variant, wherein the further locking variants are realized by using the other elements in the second planetary gear set RS2 via the seventh shift element F3. The connections of the first stepped planetary gear set StRS1 in the first transmission shift group 3 have already been described above.

[0054] In Fig. 19 is a circuit diagram for the Fig. The bottom bracket transmission shown in Figure 18 is shown with the first gear group 3 as a three-speed transmission and with the second gear group 4 as two two-speed transmissions. This results in a 3x2x2 configuration of twelve gears G1, G2, G3, G4, G5, G6, G7, G8, G9, G10, G11, and G12. The shifting diagram shows the shifting elements B1, B2, B3, B4, and F1 used for the respective gears G1, G2, G3, G4, G5, G6, G7, G8, G9, G10, G11, and G12. I , F1 II , F1 III , F1 IV , F1 V , F1 VI , F1 VII , F1 VIII , F2, F3. An X for the freewheels F1 I , F1 II , F1 III , F1 IV , F1 V , F1 VI , F1 VII , F1 VIII, F2, F3 as switching elements in the circuit diagram that lock the freewheels. This works automatically without external activation. Furthermore, an X for a brake B1, B2, B3, B4 as a switching element in the circuit diagram means that the brakes B1, B2, B3, B4 are closed. This works via a suitable actuator. An empty field for the freewheels F1 I , F1 II , F1 III , F1 IV , F1 V , F1 VI , F1 VII , F1 VIII , F2, F3 means they are not locked. An empty field for brakes B1, B2, B3, B4 means they are open.

[0055] In detail, the circuit diagram according to Fig. 19, that to realize or switch a first gear G1, the fifth switching element F1 designed as a freewheel I , F1 II , F1 III , F1 IV , F1 V , F1 VI , F1 VII , F1 VIII, the sixth switching element F2 designed as a freewheel and the seventh switching element F3 designed as a freewheel lock, that in order to realize a second gear G2 the second switching element B2 designed as a brake is closed and the sixth switching element F2 designed as a freewheel and the seventh switching element F3 designed as a freewheel lock, that in order to realize a third gear G3 the first switching element B1 designed as a brake is closed and the sixth switching element F2 designed as a freewheel and the seventh switching element F3 designed as a freewheel lock, that in order to realize a fourth gear G4 the third switching element B3 designed as a brake is closed and the fifth switching element F1 designed as a freewheel I , F1 II , F1 III , F1 IV , F1 V , F1 VI , F1 VII , F1 VIIIand block the seventh switching element F3 designed as a freewheel, that in order to realize a fifth gear G5 the second switching element B2 designed as a brake and the third switching element B3 designed as a brake as well as the seventh switching element F3 designed as a freewheel are blocked, that in order to realize a sixth gear G6 the first switching element B1 designed as a brake and the third switching element B3 designed as a brake are closed and the seventh switching element F3 designed as a freewheel is blocked, that in order to realize a seventh gear G7 the fourth switching element B4 designed as a brake is closed and the fifth switching element F1 designed as a freewheel I , F1 II , F1 III , F1 IV , F1 V , F1 VI , F1 VII , F1 VIIIand block the sixth switching element F2 designed as a freewheel, that in order to achieve an eighth gear G8 the second switching element B2 designed as a brake and the fourth switching element B4 designed as a brake are closed and the sixth switching element F2 designed as a freewheel blocks, that in order to achieve a ninth gear G9 the first switching element B1 designed as a brake and the fourth switching element B4 designed as a brake are closed and the sixth switching element F2 designed as a freewheel blocks, that in order to achieve a tenth gear G10 the third switching element B3 designed as a brake and the fourth switching element B4 designed as a brake are closed and the fifth switching element F1 designed as a freewheel I , F1 II , F1 III , F1 IV , F1 V , F1 VI , F1 VII , F1 VIIIlocks that in order to realize an eleventh gear G11 the second switching element B2 designed as a brake, the third switching element B3 designed as a brake and the fourth switching element B4 designed as a brake are closed, and / or that in order to realize a twelfth gear G12 the first switching element B1 designed as a brake, the third switching element B3 designed as a brake and the fourth switching element B4 designed as a brake are closed.

[0056] In Fig. 20 is an embodiment of the bottom bracket gear according to the invention based on Fig. 1, in which a torque sensor 5 is connected or connectable to the pedal crankshaft or to the transmission input shaft WAn. For example, a disk-shaped torque sensor 5 can be arranged at the transmission input. However, the torque sensor 5 can also be designed in a different way.

[0057] In the Fig. 21 and Fig. 22 is an embodiment of the bottom bracket gear according to the invention based on Fig. 20 with an additional electric machine EM. The electric machine EM can be connected to the pedal crankshaft WAn, as shown in Fig. 21. It is also conceivable that the electric machine EM is connected to the transmission output shaft WAb, as shown in Fig. 22. The electric machine EM is preferably arranged axially parallel to the pedal crankshaft or transmission input shaft WAn. However, a coaxial arrangement of the electric machine EM to the pedal crankshaft would also be possible. Irrespective of this, it is advantageous to connect the electric machine EM via a freewheel F0 or similar device so that, when operating without the electric machine EM, no losses are caused by the co-rotating electric machine EM.

[0058] In Fig. 23 is an embodiment of the bottom bracket gear according to the invention based on Fig. 20 is shown with an additional freewheel F between the pedal crank and the gear input of the bottom bracket transmission. This allows the freewheel to open when pedaling is interrupted, decouples the pedal crank from the inertial masses of the gear set and, in particular, the electric motor EM, so that no inertial forces are felt at the pedal. Reference symbol 1 bicycle or pedelec 2 Housing or bottom bracket shell 3 first gearshift group 4 second gearshift group 5 Torque sensor EM electric machine F0 Freewheel for electric machine F additional freewheel 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 SR1.1 first sun gear with larger number of teeth of the first stepped planetary gear set SR1.2 second sun gear with smaller number of teeth of the first stepped planetary gear set HR1.1 first ring gear with larger number of teeth of the first stepped planetary gear set HR1.2 second ring gear with smaller number of teeth of the first stepped planetary gear set SPT1 stepped planetary gear carrier of the first stepped planetary gear set SR2.1 Sun gear of the second stage planetary gear set HR2.1 first ring gear with larger number of teeth of the second stepped planetary gear set HR2.2 second ring gear with smaller number of teeth of the second stepped planetary gear set SPT2 stepped planetary gear carrier of the second stepped planetary gear set RS1 first planetary gear set RS2 second planetary gear set StRS1 first stepped planetary gear set StRS2 second stepped planetary gear set WAn gearbox input shaft or crankshaft WAB gearbox output shaft W1 first wave W2 second wave W3 third wave W4 fourth wave W5 fifth wave W6 sixth wave W7 seventh wave W8 eighth wave G1 first course G2 second gear G3 third gear G4 fourth gear G5 fifth gear G6 sixth gear G7 seventh gear G8 eighth gear G9 ninth gear G10 tenth gear G11 eleventh gear G12 twelfth gear B1 first switching element designed as a brake B2 second switching element designed as a brake B3 third switching element designed as a brake B4 fourth switching element designed as a brake F1 I fifth switching element designed as a freewheel in a first arrangement position F1 II fifth switching element designed as a freewheel in a second arrangement position F1 III fifth switching element designed as a freewheel in a third arrangement position F1 IV fifth switching element designed as a freewheel in a fourth arrangement position F1 V fifth switching element designed as a freewheel in a fifth arrangement position F1 VI fifth switching element designed as a freewheel in a sixth arrangement position F1 VII fifth switching element designed as a freewheel in a seventh arrangement position F1 VIII fifth switching element designed as a freewheel in an eighth arrangement position F2 sixth switching element designed as a freewheel F3 seventh switching element designed as a freewheel

Claims

[1] Bottom bracket gear in planetary design for a bicycle or a pedelec (1), with a pedal crankshaft (WAn) as input and a transmission output shaft (WAb) as output and with further shafts (W1, W2, W3, W4, W5, W6, W7) as well as with a first transmission shift group (3) and a second transmission shift group (4), which are coupled together to realize several gears (G1, G2, G3, G4, G5, G6, G7, G8, G9, G10, G11, G12), wherein the first transmission shift group (3) comprises a two-stage stepped planetary gear set (StRS1) to which three shift elements (B1, B2, F1 I , F1 II , F1 III , F1 IV , F1 V , F1 VI , F1 VII, F1 VIII ) are assigned, wherein a first shaft (W1) as input shaft of the first stepped planetary gear set (StRS1) is connected to a second ring gear (HR1.2) as an element of the first stepped planetary gear set (StRS1), wherein a fifth shaft (W5) as the output shaft of the first stepped planetary gear set (StRS1) is connected to a first ring gear (HR1.1) as an element of the first stepped planetary gear set (StRS1), wherein a second sun gear (SR1.2) as an element of the first stepped planetary gear set (StRS1) can be fixed to a housing (2) via a first shifting element (B1), wherein a first sun gear (SR1.1) as an element of the first stepped planetary gear set (StRS1) can be fixed to the housing (2) via a second shifting element (B2), wherein a stepped planetary gear carrier (SPT1) is rotatably mounted as an element of the first stepped planetary gear set (StRS1), and wherein, for blocking the stepped planetary gear set (StRS1), two elements of the first stepped planetary gear set (StRS1) are connected via a fifth switching element (F1 I , F1 II , F1 III , F1 IV , F1 V , F1 VI , F1 VII , F1 VIII ) can be connected to each other. [2] Bottom bracket gear according to claim 1, characterized by that the first gearshift group (3) is connected upstream or downstream of the second gearshift group (4). [3] Bottom bracket gear according to one of the preceding claims, characterized by that the second transmission shift group (4) comprises a first planetary gear set (RS1) to which a third shift element (B3) and a sixth shift element (F2) are assigned, wherein in the second gear shift group (4) a second element of the first planetary gear set (RS1) is connected to the pedal crankshaft (WAn) or to the fifth shaft (W5) as the output shaft of the first stepped planetary gear set (StRS1), wherein a first element of the first planetary gear set (RS1) can be fixed to the housing (2) via the third shift element (B3), wherein a third element of the first planetary gear set (RS1) is connected to the transmission output shaft (WAb) or to the first shaft (W1) as the input shaft of the first stepped planetary gear set (StRS1), and wherein, in order to block the first planetary gear set (RS1), two elements of the first planetary gear set (RS1) can be connected to one another via the sixth switching element (F2). [4] Bottom bracket gear according to one of claims 1 or 2, characterized by that the second gear shift group (4) comprises a first planetary gear set (RS1) and a second planetary gear set (RS2), to which a third shift element (B3), a fourth shift element (B4) and a sixth shift element (F2) are assigned, wherein in the second gear shift group (4) a second element of the first planetary gear set (RS1) is connected to the pedal crankshaft (WAn) or to the fifth shaft (W5) as the output shaft of the first stepped planetary gear set (StRS1), wherein a first element of the first planetary gear set (RS1) and a first element of the second planetary gear set (RS2) are connected to the transmission output shaft (WAb) or to the first shaft (W1) as the input shaft of the first stepped planetary gear set (StRS1), wherein a third element of the first planetary gear set (RS1) can be fixed to the housing (2) via the third switching element (B3), wherein the third element of the first planetary gear set (RS1) is connected to a second element of the second planetary gear set (RS2), wherein a third element of the second planetary gear set (RS2) can be fixed to the housing (2) via the fourth switching element (B4), and wherein, for blocking the first planetary gear set (RS1) and the second planetary gear set (RS2), two shafts connected to elements of the planetary gear sets (RS1, RS2) can be connected to one another via the sixth switching element (F2). [5] Bottom bracket gear according to one of claims 1 or 2, characterized by , that the second transmission shift group (4) comprises a second stepped planetary gear set (StRS2) to which a third shift element (B3), a fourth shift element (B4) and a sixth shift element (F2) are assigned, wherein in the second gear shift group (4) a second ring gear (HR2.2) as an element of the second stepped planetary gear set (StRS2) is connected to the pedal crankshaft (WAn) or to the fifth shaft W5 as the output shaft of the first stepped planetary gear set (StRS1), wherein a first ring gear (HR2.1) as an element of the second stepped planetary gear set (StRS2) is connected to the transmission output shaft (WAb) or to the first shaft (W1) as the input shaft of the first stepped planetary gear set (StRS1), wherein a stepped planetary gear carrier (SPT2) as an element of the second stepped planetary gear set (StRS2) can be fixed to the housing (2) via the third shifting element (B3), wherein a sun gear (SR2.1) as an element of the second stepped planetary gear set (StRS2) can be fixed to the housing (2) via the fourth shifting element (B4), and wherein, in order to block the second stepped planetary gear set (StRS2), two elements of the second stepped planetary gear set (StRS2) can be connected to one another via the sixth shift element (F2). [6] Bottom bracket gear according to one of claims 1 or 2, characterized by , that the second transmission shift group (4) comprises a first planetary gear set (RS1) and a second planetary gear set (RS2), to which a third shift element (B3), a fourth shift element (B4), a sixth shift element (F2) and a seventh shift element (F3) are assigned, wherein in the second gearshift group (4) a second element of the first planetary gear set (RS1) is connected to the pedal crankshaft (WAn) or to the fifth shaft (W5) as the output shaft of the first stepped planetary gear set (StRS1), wherein a first element of the first planetary gear set (RS1) is connected to the transmission output shaft (WAb) or to the first shaft (W1) as input shaft of the first stepped planetary gear set (StRS1), wherein a third element of the first planetary gear set (RS1) is connected to a second element of the second planetary gear set (RS2), wherein a third element of the second planetary gear set (RS2) can be fixed to the housing (2) via the third switching element (B3) and can be connected to the pedal crankshaft (WAn) or to the fifth shaft (W5) as the output shaft of the first stepped planetary gear set (StRS1) via the sixth switching element (F2), and wherein a first element of the second planetary gear set (RS2) can be fixed to the housing (2) via the fourth shifting element (B4) and can be connected to the transmission output shaft (WAb) or to the first shaft (W1) as the input shaft of the first stepped planetary gear set (StRS1) via the seventh shifting element (F3). [7] Bottom bracket gear according to one of claims 1 or 2, characterized by in that the second transmission shift group (4) comprises a first two-speed group and a second two-speed group, the third shift element (B3) and the sixth shift element (F2) being assigned to the first two-speed group and the fourth shift element (B4) and the seventh shift element (F3) being assigned to the second two-speed group. [8] Bottom bracket gear according to claim 7, characterized bythat in the first two-speed group, a second element of the first planetary gear set (RS1) is connected to the pedal crankshaft (WAn) or to the fifth shaft (W5) as the output shaft of the first stepped planetary gear set (StRS1), that a third element of the first planetary gear set (RS1) is connected to a second element of the second planetary gear set (RS2), that a first element of the first planetary gear set (RS1) can be fixed to the housing (2) via the third switching element (B3), that for blocking the first planetary gear set (RS1) two elements of the first planetary gear set (RS1) can be connected to one another via the sixth switching element (F2), that in the first two-speed group, a first element of the second planetary gear set (RS2) is connected to the transmission output shaft (WAb) or to the first shaft (W1) as the input shaft of the first stepped planetary gear set (StRS1), that a third element of the second planetary gear set (RS2) can be fixed to the housing (2) via the fourth switching element (B4), and that in order to block the second planetary gear set (RS2), two elements of the second planetary gear set (RS2) can be connected to one another via the seventh switching element (F3). [9] Bottom bracket gear according to one of the preceding claims, characterized by that the first switching element (B1), the second switching element (B2), the third switching element (B3) and the fourth switching element (B4) are each designed as a positive-locking brake, and / or that the fifth switching element (F1 I , F1 II , F1 III , F1 IV , F1 V , F1 VI , F1 VII , F1 VIII ), the sixth switching element (F2) and the seventh switching element (F3) are each designed as a freewheel. [10] Bottom bracket gear according to one of the preceding claims, characterized bythat the first planetary gear set (RS1) and / or the second planetary gear set (RS2) are each designed as a minus planetary gear set. [11] Bottom bracket gear according to claim 10, characterized by that in a minus planetary gear set the first element is designed as a sun gear (SR1, SR2), the second element as a planet gear carrier (PT1, PT2) and the third element as a ring gear (HR1, HR2). [12] Bottom bracket gear according to one of the preceding claims, characterized by that the first planetary gear set (RS1) and / or the second planetary gear set (RS2) are each designed as a plus planetary gear set. [13] Bottom bracket gear according to claim 12, characterized by that in a plus planetary gear set the first element is designed as a sun gear (SR1, SR2), the second element as a ring gear (HR1, HR2) and the third element as a planet gear carrier (PT1, PT2). [14] Bottom bracket gear according to one of the preceding claims, characterized bythat a torque sensor (5) is connected to the pedal crankshaft (WAn). [15] Bottom bracket gear according to one of the preceding claims, characterized by that at least one electrical machine (EM) is connected or connectable to the pedal crankshaft (WAn) or to the transmission output shaft (WAb). [16] Bottom bracket gear according to claim 15, characterized by that the electric machine (EM) is arranged axially parallel to the pedal crankshaft (WAn). [17] Bicycle or pedelec (1) with the bottom bracket gear according to one of the preceding claims.

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