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1. (WO2018226095) TRANSMISSION FOR A BICYCLE
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Claims

1. Transmission for a bicycle, including:

an input formed by a crank axle, and an output connectable to a front sprocket and/or chain ring of the bicycle,

a housing connectable or connected to a frame of the bicycle, a first planetary gear set having at least three rotational members, wherein a first rotational member is connected to the crank axle, a second rotational member is connected to the output and a third rotational member is connected to the housing,

a sensor between the third rotational member and the housing, and an electric motor with a stator connected to the housing and a rotor connected to the output,

wherein the third rotational member is formed by a planet carrier.

2. Transmission according to claim 1, wherein at least a part of the third rotational member is part of the housing.

3. Transmission according to claim 1 or 2, wherein one or more planet shafts are connected to the planet carrier and/or housing.

4. Transmission according to claim 1, 2 or 3, wherein the sensor is connected to the planet carrier, and or the housing, and/or one or more of the planet shafts.

5. Transmission according to any one of claims 1-4, wherein the second rotational member is formed by a sun gear.

6. Transmission according to any one of claims 1-5, wherein the first rotational member is formed by a further sun gear.

7. Transmission according to any one of claims 1-5, wherein the first rotational member is formed by a ring gear.

8. Transmission according to claim 7, wherein the planet carrier includes one or more pairs of planet gears, wherein the planet gears of each pair can mesh with each other, wherein one of the meshing planet gears of the pair meshes with the ring gear, and wherein the other one of the meshing planet gears of the pair meshes with the sun gear.

9. Transmission according to any one of the preceding claims, including a sub-transmission with torque transfer elements and at least with one sub-transmission input and one sub-transmission output, wherein the sub-transmission input is connected to the output of the first planetary gear set and the sub-transmission output is connected to the front sprocket and/or chain ring

10. Transmission according to any claim 9, wherein the sub-transmission is embodied as a stepped gear transmission.

11. Transmission according to claim 9, wherein the sub-transmission is embodied as a continuously variable transmission.

12. Transmission according to claim 9, wherein the sub-transmission is embodied as a second planetary gear set with at least three rotational members, wherein a first rotational member is connected to the output of the first planetary gear set, a second rotational member is connected to the front sprocket and/or chain ring, and a third rotational member is connected to a torque reaction element.

13. Transmission according to claim 12, wherein the electric motor is connected to the first, second or third rotational member of the second planetary gear set.

14. Transmission according to claim 13, wherein the electric motor is connected to the third rotational member of the second planetary gear set.

15. Transmission according to any one of claims 12-14, wherein a first clutch and/or first freewheel is present between the third rotational member of the second planetary gear set and the housing

16. Transmission according to any one of claims 12-15, wherein a second clutch and/or second freewheel is present between two of the three rotational members of the second planetary gear set.

17. Transmission according to any one of claims 12-16, wherein the first rotational member of the second planetary gear set is a sun gear.

18. Transmission according to any one of claims 12-17, wherein the second rotational member of the second planetary gear set is a planet carrier.

19. Transmission according to any one of claims 12-18, wherein the third rotational member of the second planetary gear set is an annulus / ring gear.

20. Transmission according to any one of the preceding claims, wherein he electric motor is directly connected to the chain ring.

21. Transmission according to any one of the preceding claims, wherein an overrunning bearing or an overrunning clutch is connected between the crank axle and the first rotational member of the first planetary gear set, and/or between the output and the second rotational member of the first planetary gear set, and/or between the output and the electric motor.

22. Transmission according to any one of the preceding claims, wherein the output is formed by a hollow axle that is concentric with the crank axle.

23. Transmission according to any one of the preceding claims, wherein the sensor includes one or more of a force sensor, a position sensor, a displacement sensor, and a rotation sensor.

24. Transmission according to any one of the preceding claims, including a calculation unit arranged for calculating the torque that is transmitted to the housing on the basis of a measurement value of the sensor.

25. Bicycle including a transmission according to any one of claims 1-24.

26. Bicycle according to claim 25, including a control unit arranged for controlling the electric motor as a function of the measured sensor value and/or the calculated torque.

27. Method for determining a torque applied to a crank axle of a bicycle using a sensor,

wherein the sensor is arranged between a third rotational member and a housing of a transmission having an input formed by the crank axle, and an output connected to a front sprocket and/or chain ring of the bicycle, the housing being connected to a frame of the bicycle,

wherein the transmission has a first planetary gear set having at least three rotational members, wherein a first rotational member is connected to the crank axle, a second rotational member is connected to the output and the third rotational member is connected to the housing, and an electric motor with a stator connected to the housing and a rotor connected to the output, wherein the third rotational member is formed by a planet carrier,

the method further including:

determining the torque on the basis of a measured value of the sensor.

28. The method of claim 27, wherein the sensor is arranged for measuring one or more of force, position, displacement, and rotation.

29. A method for supporting a cyclist, including:

- determining a torque applied by the cyclist to a crank axle of a bicycle according to claim 27 or 28, and

controlling the electric motor of the bicycle as a function of the calculated torque.