Driving device for bicycle

Abstract

The invention relates to a driving device for a bicycle. The drive device has a pawl flywheel (14). The pawl flywheel (14) has a first ring (30) with at least two pawls (34) movably mounted thereon and a second ring (32) with teeth (36). The drive device has at least one sensor device (28) which is designed to detect a deformation of the first ring (30) of the pawl flywheel (14) due to the applied driving force. The pawls (34) are arranged on the first ring (30) at non-uniform intervals in the circumferential direction. The invention also relates to a bicycle.

Description

Technical Field

[0001] The invention relates to a drive device for a bicycle. In addition, the invention relates to a bicycle. Background Art

[0002] Bicycles are known to have flywheels. This allows, for example, the pedal crankshaft to be disengaged from the driven wheel. This allows the bicycle to roll without the corresponding pedals turning. For example, on electric assisted bicycles, the flywheel can also be used to disengage the drive motor. On the other hand, in the locked state, the flywheel can connect the two shafts to each other for common rotation, for example to enable the transmission of drive power.

[0003] By detecting deformations of components of the flywheel, the transmitted drive force can be detected, for example to control a drive. However, depending on the design of the flywheel and the relative position of the two shafts connected to each other, interference variables may occur. For example, radial forces can act in the flywheel in the locked state, which deform the flywheel depending on the locked state position. Therefore, the detected deformation can only correspond imprecisely to the transmitted drive force.

[0004] DE 10 2012 100 682 A1 describes a torque sensor and a flywheel with a first rotating element, by means of which a torque to be determined can be transmitted in one rotational direction to a second rotating element coaxial with the first rotating element. In addition, a device is described for determining a rotation of the first rotating element relative to the second rotating element in the rotational direction and for determining the torque based on the determined rotation. The torque determination is therefore very complex. Summary of the invention

[0005] A first aspect relates to a drive device for a bicycle. The drive device may, for example, include a transmission, a pedal crankshaft, a wheel and corresponding power transmission elements of the wheel. The drive device may include a drive motor (e.g., designed as an electric motor). The drive device may be designed for a bicycle designed as an electric power-assisted bicycle. The drive device may be designed to transmit the driving force from the rider and optionally from the drive motor to the wheel.

[0006] The drive device has a pawl flywheel. A pawl flywheel is also called a ratchet flywheel. For example, the flywheel can transmit torque only in one direction of rotation, wherein the flywheel is then in its locked state. On the other hand, with a relative reversal of the direction of rotation, the connection is automatically released, which means that the flywheel is then in its released state. In the locked state, the corresponding pawl of the pawl flywheel can be engaged. However, in the released state, for example, the pawl of the pawl flywheel slides out. The pawl flywheel can, for example, be designed to uncouple a drive (such as a pedal crankshaft) from an output member. For example, the pawl flywheel can also uncouple the pedal crankshaft from the drive motor or uncouple the drive motor from the pedal crankshaft. The pawl flywheel can also be designed to change the gears in the transmission of the drive device.

[0007] The pawl flywheel has at least a first ring and a second ring. The two rings can each be permanently connected to the shaft of the drive device so that they cannot rotate. The rings can also form a disk. For example, a ring formed as an inner ring with a radially extending wall can be non-rotatably connected to the shaft. The rings can also have corresponding non-annular partial areas and alternatively or additionally dispersed through-openings.

[0008] The second ring has a toothed portion. The toothed portion may extend radially inward or outward along the periphery of the second ring, for example. The toothed portion may be designed to be engaged by a pawl. The pawl flywheel has at least two pawls movably mounted on the first ring. The pawl may also be referred to as a locking pawl. The pawl may, for example, be mounted on the first ring at an end facing the second ring so that they can rotate around the axial rotation axis. For example, in the locked state of the pawl flywheel, the pawl engages with the teeth of the second ring. For example, the pawl may be spring-biased with respect to the engagement. In the released state, the engagement of the pawl with the toothed portion is canceled. In the locked state, the two rings are non-rotatably connected to each other via engagement. In the released state, the pawl, for example, slides off the toothed portion, and the two rings can rotate relative to each other in one rotational direction. For example, the pawl may allow the two rings to rotate relative to each other in one rotational direction, and once the pawl has engaged with the toothed portion, the two rings are prevented from rotating in the opposite direction. The pawl and the toothed portion may be arranged on the sides of the two rings facing each other. The two rings may be arranged coaxially with each other. The two rings may be arranged in the same axial region. The two rings may each be mounted so that they can rotate about a central axis. For example, one of the two rings is permanently connected to the input shaft of the pawl freewheel or the shaft of the drive device for common rotation. For example, the other of the two rings is permanently connected to the output shaft of the pawl freewheel or the shaft of the drive device for common rotation.

[0009] The drive device has a sensor device, which is designed to detect the deformation of the first ring of the pawl flywheel due to the applied driving force. The driving force can be transmitted to the second ring in the locked state, or from the second ring to the first ring in the locked state. The driving force can be introduced into the drive device, for example, by the rider of the bicycle at the corresponding pedal. The detected deformation can, for example, provide information about the torque transmitted. The applied driving force can correspond to the torque transmitted. This detection can, for example, realize power measurement, automatic control of the gear shifting of the bicycle and alternatively or additionally control of the drive motor. Control can also take place directly as a function of the detected deformation.

[0010] The sensor device can, for example, have at least one sensor. The sensor can be attached to the first ring. If several sensors are provided, these sensors can be arranged evenly spaced in the circumferential direction. If several sensors are provided, they can be arranged at the same periphery on the first ring or at the same radial distance from the axis of rotation. The sensor can, for example, be arranged axially at the height of the pawl flywheel. The sensor device can, for example, be designed to determine the deformation in a resistive, magnetic, optical or acoustic manner. For example, the sensor device can have one or more strain gauges attached to the first ring. Alternatively, Hall sensors, for example, can also be used. The sensor device can have an evaluation device to evaluate the corresponding sensor signals. For example, if several sensors are provided, their sensor signals can be combined into a single measurement value.

[0011] The pawls are arranged unevenly spaced in the circumferential direction on the first ring. For example, the distance between the first pawl and the second pawl can be greater in the left-hand circumferential direction than in the right-hand circumferential direction. For example, if three pawls are provided, the distance between the first pawl and the second pawl can be greater in the circumferential direction than the distance between the second pawl and the third pawl. For example, the distance between two adjacent pawls is different from the distance between two other adjacent pawls. For example, the first latch can be located at the 11 o'clock position, the second latch is located at the 1 o'clock position and the third latch is located at the 6 o'clock position. Here, the position using the clock time is used to visualize the fixed distance. The rotation of the two rings can change the actual position of the latches during operation, but cannot change their relative distance from each other. The following explanation of two pawls is also applicable to three or more pawls, if applicable. The spacing in the circumferential direction can correspond to the angular spacing. There can be a circumferential area without pawls between two pawls or pawl groups.

[0012] The distance between the two pawls in the circumferential direction may be the angle between the first pawl and the second pawl adjacent to the first pawl in the circumferential direction starting from the center point or the rotation axis of the pawl flywheel. It may be measured, for example, at the bearing point or the engagement point of the two pawls. For example, the angular distance between the two pawls may be based on the same point for each pawl.

[0013] Due to the uneven spacing in the circumferential direction, there may be a particularly large pawl-free circumferential area on the first ring. In this pawl-free circumferential area, the deformation caused by the applied drive force can be detected particularly accurately. Interference variables caused, for example, by radial reaction forces on the pawl are low here and may also have been homogenized. This effect can be greatest in the center of the pawl-free circumferential area. For example, the sensor can be arranged in the center of the circumferential direction in the pawl-free circumferential area. The selected pawl-free circumferential area can be the largest pawl-free circumferential area. In addition, even if a large number of pawls are used, the applied drive force can be accurately detected. A large number of pawls can transmit large drive forces. However, for many pawls, not all pawls can be evenly engaged due to, for example, manufacturing tolerances. However, due to the uneven spacing of the pawls, this can only have a small interference effect on the measurement signal. For example, the pawls of the pawl flywheel can be arranged closely in two or more groups, and a large distance can be provided between these groups. Grouping can also bring the introduced forces together so that the tangential force dominates overall.

[0014] In one embodiment of the drive device, the first ring can be designed as an inner ring and the second ring can be designed as an outer ring. The second ring can be arranged radially on the outside of the first ring. The toothing can then be arranged radially on the inside of the second ring. This can make production particularly cost-effective and simple. In addition, the corresponding sensor can be easily attached to the first ring. The corresponding pawl can, for example, be mounted radially on the inside of the first ring.

[0015] In one embodiment of the drive device, it can be provided that the first ring is designed as an outer ring and the second ring is designed as an inner ring. The first ring can be arranged radially on the outside of the second ring. The toothing can then be arranged radially on the outside of the second ring. The corresponding pawl can, for example, be mounted radially on the inside of the first ring. This can simplify the assembly of the pawl.

[0016] The outer ring can, for example, be molded as a separate component or alternatively be molded as an integrated component, for example the outer ring can be integrated into the output shaft as an integrated component. In other words, the output shaft is provided with a toothing forming an integrated outer ring. The inner ring can, for example, be molded as a separate component or alternatively be molded as an integrated component, for example the inner ring can be integrated into the bottom bracket shaft as an integrated component. In other words, the bottom bracket shaft is provided with a toothing forming an integrated inner ring.

[0017] In one embodiment of the drive device, provision can be made that the second ring has a continuous toothing in the circumferential direction. As a result, engagement can be ensured particularly quickly and, for example, even at a small rotation angle in the locking direction. The second ring can also be easy to manufacture. For example, the toothing can be formed by the side surface of the second ring. For example, the toothing can be arranged radially inwards or radially outwards.

[0018] In one embodiment of the drive device, it can be provided that the drive device has at least a first pawl area and a second pawl area. A pawl area can be formed by pawls that are arranged closer together in the circumferential direction than other pawls of the pawl flywheel that do not belong to the pawl area. The pawls of a pawl area can form a group of pawls. The pawls of a pawl area can be evenly spaced. The first pawl area has at least two pawls. The second pawl area has at least one pawl. Thus, for example, the pawl flywheel has at least three pawls. For example, the pawl flywheel can have four pawls, two of which are assigned to each pawl area. The pawl flywheel can also have three pawl areas, for example, each pawl area has two, three or more pawls. Four or more pawl areas can also be provided. A large number of pawls makes it easier for the pawl flywheel to withstand high drive forces.

[0019] The distance between the pawls of the first pawl area in the circumferential direction may be different from the distance between the two pawl areas in the circumferential direction. For example, the distance between the pawls of one pawl area may always be less than the distance between different pawl areas. For example, the first pawl may be arranged at the 11 o'clock position, the second pawl may be arranged at the 1 o'clock position, the third pawl may be arranged at the 5 o'clock position, and the fourth pawl may be arranged at the 7 o'clock position. Then the first pawl and the second pawl are assigned to the first pawl area, and the third pawl and the fourth pawl are assigned to the second pawl area. Then, the distance between the pawls in each pawl area corresponds to 60°, and the distance between the two pawl areas corresponds to 120°. The distance between the pawls in one pawl area may be, for example, the shortest distance between adjacent pawls. The distance between the pawl areas may be the distance between the outermost pawls of the pawl areas adjacent in the circumferential direction. The distance between the pawl areas may also be the distance between the centers of the corresponding pawl areas in the circumferential direction.

[0020] In one embodiment of the drive device, it can be provided that the second pawl area has at least two pawls. The distance between the pawls of the second pawl area in the circumferential direction can be different from the distance between the two pawl areas in the circumferential direction. The grouping in the pawl area means that the force application is very uniform, and for the corresponding sensor, large distances are possible. For example, each pawl area can have the same number of pawls.

[0021] In one embodiment of the drive device, provision can be made for the pawls in the pawl area to be evenly spaced apart on the first ring in the circumferential direction. For example, the distance between different adjacent pawls of a pawl area can always be the same. The pawls of each pawl area can be arranged identically in the pawl area. For example, all pawl areas can have three pawls, wherein all adjacent pawls in each pawl area have the same spacing in the circumferential direction.

[0022] In one embodiment of the drive device, it can be provided that the pawl areas are evenly spaced in the circumferential direction on the first ring. Therefore, the distance between each adjacent pawl area in the circumferential direction can also be the same. This can lead to a certain symmetry. All pawl areas can have pawls arranged in the same manner. For example, each pawl area can have at least two pawls.

[0023] In one embodiment of the drive device, it can be provided that the individual force transmission areas of the pawl area are arranged symmetrically relative to the detection area of ​​the sensor device. The force transmission area can be an area where the pawl introduces force into the first ring. The force transmission area can be, for example, an area that supports the pawl in the locked state. For example, the first ring can have an associated recess for each pawl, which has a circular shape corresponding to the adjacent end of the pawl. Then, when the pawl engages with the tooth on the second ring, the pawl is supported in the recess with this end on the first ring. The detection area can be, for example, an area where the sensor device measures the deformation of the first ring. The detection area can be, for example, an area where a strain gauge is attached to the first ring. The detection area can be a measuring point. For example, the distance in the circumferential direction from the two pawl areas to the detection area of ​​the sensor device can be the same. The sensor device can also have several detection areas. The pawl area can be arranged symmetrically relative to one, some or all of the detection areas. Due to the symmetry, the interference force from the latch is more uniform relative to the detection area. For example, if the pawl itself is arranged symmetrically relative to the detection area, it is possible to introduce force asymmetrically relative to the detection area and therefore also to introduce reaction force and interference force. For example, the force transmission area can be arranged axially symmetrically with respect to an axis of symmetry extending vertically through the axis of rotation of the pawl flywheel. For example, the sensors of the sensor device can be arranged on both sides of the axis of symmetry. Each of these sensors can be arranged, for example, at the maximum distance from the axis of symmetry in the circumferential direction, for example centered between two intersections of the periphery and the axis of symmetry in the circumferential direction. The sensor can be arranged on the inner wheel on an axis perpendicular to the axis of symmetry. The respective end of the pawl that engages in the toothing can be arranged asymmetrically with respect to the detection area.

[0024] In one embodiment of the drive device, provision can be made for the sensor device to be designed to detect deformations of the first ring in at least one region which is located in the circumferential direction between the respective detents, for example in the center. For example, the detection region can be arranged in the circumferential direction in a detent-free region.

[0025] In one embodiment of the drive device, provision can be made for the sensor device to be designed to detect deformations of the first ring in an area in which the torque applied by the rider to the pedals of the bicycle drive has been totaled. This makes the detected deformations particularly suitable for controlling the drive train and alternatively or additionally for power detection. For example, the corresponding sensor is arranged on the first ring, for example axially in the area of ​​the second ring. For example, all torques from the two pedals of the bicycle can already be totaled on the first ring. If the pedal crank forms the first ring, the applied torque can be axially totaled, for example, in the area of ​​the second ring or the pawl. For example, the torques from both pedals can be totaled for the first time at the point of tapping from the pedal crank. Alternatively or additionally, the sensor device is designed to detect deformations of the first ring in an area in which the torque applied by the rider to the pedals of the bicycle drive has not yet been superimposed with the drive torque of the drive motor. For example, the drive motor can be easily controlled depending on the driving force of the rider.

[0026] In one embodiment of the drive device, it can be provided that the drive device has a pedal crankshaft and an output shaft. The pedal crankshaft can, for example, be permanently connected to one of the two rings for common rotation. The output shaft can, for example, be permanently connected to the other of the two rings for common rotation. The pedal crankshaft can be mounted on a bicycle frame or a drive housing. The crank arm can be attached to the pedal crankshaft on both sides at the axial end region for common rotation. The pedal can be rotatably mounted on the crank arm. For example, the output shaft can have a pinion. The output shaft can be mechanically operably connected to the wheel, for example, via a belt or chain. The pawl flywheel can be designed to connect the pedal crankshaft to the output shaft. In the locked state of the pawl flywheel, the output shaft can be driven by the pedal crankshaft. On the other hand, in the released state, the pedal crankshaft can be decoupled from the output shaft, for example, so that the pedal crankshaft cannot be driven by the wheel.

[0027] A second aspect relates to a bicycle having: a drive device according to the first aspect; and an output element. The output element may, for example, be the rear wheel of the bicycle. The output element may be drivable by the drive device (for example when the pawl freewheel is in its locked state). Corresponding advantages and further features may be found in the description of the first aspect, wherein embodiments of the first aspect also form embodiments of the second aspect and vice versa. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1A pawl freewheel of a drive device of a bicycle according to the prior art is shown in a schematic side view along the rotation axis of the pawl freewheel.

[0029] Figure 2 A first embodiment of a pawl freewheel of a drive device of a bicycle is shown in a schematic side view along the rotation axis of the pawl freewheel.

[0030] Figure 3 The installation of a drive device in a bicycle is shown.

[0031] Figure 4 A second embodiment of a pawl freewheel of a drive device of a bicycle is shown in a schematic side view along the axis of rotation of the pawl freewheel. DETAILED DESCRIPTION

[0032] Figure 3 The installation of a drive device in a bicycle is schematically shown. The drive device has a pedal crankshaft 10 to which crank arms 12 are fixed on both sides. A pedal (not shown) is rotatably attached to each crank arm 12. The drive device also has a pawl flywheel 14 and an output shaft 16 with a pinion. The pawl flywheel 14 can be automatically switched between a locked state and a released state, in which the pawl flywheel 14 connects the pedal crankshaft 10 to the output shaft 16 for common rotation, and in which the pedal crankshaft 10 can rotate relative to the output shaft 16 (depending on the relative rotation direction of the pedal crankshaft 10 and the output shaft 16 relative to each other). In the locked state, torque can be transmitted accordingly by the pawl flywheel 14.

[0033] The drive device has a sensor device designed to detect the driving force applied by the rider to the pedal crankshaft 10. In one embodiment, the electric drive motor of the bicycle is controlled as a function of the detected torque. Conventionally, the sensor device has two strain gauges 90 as sensors for this purpose, each of which is axially arranged adjacent to one pedal crank arm 12 on the pedal crankshaft 10 in order to detect the driving force applied to the pawl flywheel 14. However, due to the varying weight load from the rider, this can lead to considerable interference variables. In addition, the measured values ​​from both sides are then combined in order to record the total driving force applied.

[0034] Alternatively, it is therefore also possible to detect the driving force applied to the ratchet freewheel 14 by measuring the axial deformation at the height of the ratchet freewheel 14 . Figure 1A conventional pawl flywheel 14 according to the prior art is shown. The pawl flywheel 14 has a first ring 30, which is designed as an inner ring and, in the example shown, is permanently connected to the pedal crankshaft 10 for common rotation. On the first ring 30, four pawls 34 are mounted on the outer circumference with their ends movably (in this case pivotably). The four pawls 34 are evenly spaced apart in the circumferential direction on the first ring 30. An angular spacing of 90° is provided in the circumferential direction between all adjacent pawls 34. In addition, the pawl flywheel 14 has a second ring 32. The second ring 32 is designed as an outer ... Figure 1 In the example shown, the second ring 32 is permanently connected to the output shaft 16 for common rotation. The second ring 32 has a toothing 36 which, in the example shown, points radially inwards and is formed on the inside surface of the second ring 32. The toothing 36 is designed to engage with the corresponding end of the pawl 34 facing away from the first ring 30. In the locked state of the pawl flywheel 14, the pawl 34 engages with the toothing 36 so that the two rings 30, 32 are coupled to each other for common rotation. In the released state, the pawl 34 slides on the toothing, thus allowing the two rings 30, 32 to rotate relative to each other.

[0035] In the circumferential region between two adjacent pawls 34, sensors 28 are arranged on the first ring 30 at equal radial distances from the axis of rotation of the pawl freewheel 14 on two opposite sides. The two sensors 28 replace the strain gauges 90 in the sensor arrangement. The sensors 28 are designed as strain gauges and detect deformations of the first ring 30 due to the applied drive forces. The sensor arrangement is therefore also designed to detect deformations of the first ring 30 of the pawl freewheel 14 due to the applied drive forces. In the case of the pawl freewheel 14, the corresponding laterally applied drive forces are already added together to form the total applied drive force.

[0036] However, using Figure 1 With the conventional pawl flywheel 14 shown, considerable interfering variables may act within the measuring range of the two sensors 28. There are radial reaction forces in the pawls 34. In addition, the pawls 34 may engage unevenly due to manufacturing tolerances, as a result of which different pawls 34 transmit different amounts of drive force. Therefore, the detection of the applied drive force by the sensors 28 is inaccurate.

[0037] Figure 2 The first embodiment of the pawl freewheel 14 shown reduces these interference effects. Figure 1The difference between the conventional pawl flywheel 14 shown. In this first embodiment, the pawls 34 are arranged unevenly spaced in the circumferential direction on the first ring 30. In the example shown, the first ring 30 has a first pawl area 40 and a second pawl area 42. Each pawl area 40, 42 has two pawls 34 arranged close to each other in the circumferential direction. In the example shown, the angular distance between the two pawls 34 of the pawl area is 30°. Therefore, the pawls 34 facing each other in different areas are further spaced apart, in this case with an angular spacing of 150°. Therefore, the distance between the pawls 34 of the two pawl areas 40, 42 in the circumferential direction is different from the distance between the two pawl areas 40, 42 in the circumferential direction. Correspondingly, a large pawl-free circumferential area with an angular range of 150° is provided between the pawl areas 40, 42, although the number of pawls 34 is the same as in the conventional pawl flywheel 14. The arrangement of the pawls 34 in each pawl area 40, 42 is the same.

[0038] In the first embodiment, the two sensors 28 are arranged one sensor 28 in each detent-free circumferential region, i.e. between the detents 34 of the two detent regions 40, 42. This leads to a greater homogenization of the applied force and a lower influence of interfering variables from the detents 34 in the measuring range of the sensors 28. As a result, the applied drive force can be detected particularly precisely.

[0039] In a first embodiment of the pawl freewheel 14, the pawls 34 are arranged in recesses on the outer circumference of the first ring 30. The rounded ends of the pawls 34 facing the first ring 30 in the locked state are supported on the bases of these recesses in the locked state. In the first embodiment, the recesses and therefore the pawls 34 are each arranged symmetrically with respect to the arrangement of the two sensors 28 on the first ring 30 and therefore also with respect to the detection range of the sensors 28. The corresponding symmetry axis 44 is arranged at Figure 2 The sensor 28 is arranged axially symmetrically with respect to an axis of symmetry 44 which extends radially through the axis of rotation of the pawl freewheel 14. However, this results in an asymmetrical arrangement of the force transmission region to the detection region of the sensor device.

[0040] Figure 4 A second embodiment of the pawl flywheel 14 is shown. Figure 2 In the second embodiment, the recesses and therefore the pawls 34 are also arranged asymmetrically with respect to the arrangement of the two sensors 28 on the first ring 30 and are therefore also not axially symmetrical with respect to the detection areas of the sensors 28. Instead, the force transmission area is arranged symmetrically with respect to the sensor device and the detection area of ​​the sensor 28. This can be seen from Figure 4 The axis of symmetry 44 is identified in FIG. Figure 4 Two lines 46 are drawn in, each forming a straight line between the force transmission area of ​​the pawl 34 and the center of the first ring 30. It can be seen that the force transmission area is arranged symmetrically with respect to the symmetry axis and thus symmetrically with respect to the detection area of ​​the sensor device. This leads to a more uniform application of force with respect to the sensor 28, which makes the detection of the applied driving force particularly precise.

[0041] Reference numerals

[0042] 10 Pedal crankshaft

[0043] 12 Crank Arm

[0044] 14 pawl freewheel

[0045] 16 Output shaft

[0046] 28 Sensors

[0047] 30 First Ring

[0048] 32 Second Ring

[0049] 34 Pawl

[0050] 36 teeth

[0051] 40 First pawl area

[0052] 42 Second pawl area

[0053] 44 Axis of symmetry

[0054] 46 lines

[0055] 90 Strain gauge

Claims

1. A drive device for a bicycle, wherein the drive device comprises a pawl freewheel (14), wherein the pawl freewheel (14) comprises a first ring (30) and a second ring (32), wherein the first ring (30) comprises at least two pawls (34) movably mounted on the first ring (30), and the second ring (32) comprises a toothed portion (36), The drive device has at least one sensor device (28) which is designed to detect a deformation of the first ring (30) of the pawl flywheel (14) caused by the applied drive force, The pawls (34) are arranged on the first ring (30) at uneven intervals in the circumferential direction.

2. Drive device according to one of the preceding claims, characterized in that The first ring (30) is designed as an inner ring, and the second ring (32) is designed as an outer ring.

3. The driving device according to claim 1, characterized in that: The first ring (30) is designed as an outer ring, and the second ring (32) is designed as an inner ring.

4. Drive device according to one of the preceding claims, characterized in that The second ring (32) has a toothed portion (36) that is continuous in the circumferential direction.

5. Drive device according to one of the preceding claims, characterized in that The drive device has at least a first pawl area (40) and a second pawl area (42), wherein the first pawl area (40) has at least two pawls (34), wherein the second pawl area (42) has at least one pawl (34), The distance between the pawls (34) of the first pawl area (40) in the circumferential direction is different from the distance between the two pawl areas (40, 42) in the circumferential direction.

6. The driving device according to claim 5, characterized in that: The second detent area (42) has at least two detents (34), The distance between the pawls (34) of the second pawl area (42) in the circumferential direction is different from the distance between the two pawl areas (40, 42) in the circumferential direction.

7. The driving device according to claim 5 or 6, characterized in that: The detents (34) in the detent areas (40, 42) are arranged evenly spaced apart in the circumferential direction on the first ring (30).

8. Drive device according to one of claims 5 to 7, characterized in that The detent areas (40, 42) are arranged on the first ring (30) at uniform intervals in the circumferential direction.

9. Drive device according to one of the preceding claims 5 to 8, characterized in that The individual force transmission regions of the detent regions (40, 42) are arranged symmetrically with respect to the detection region of the sensor device.

10. Drive device according to one of the preceding claims, characterized in that The sensor device is designed to detect deformation of the first ring (30) in at least one region which is located between respective detents (34) in the circumferential direction.

11. Drive device according to one of the preceding claims, characterized in that The drive device comprises a pedal crankshaft (10) and an output shaft (16). The pawl flywheel (14) is designed to connect the pedal crankshaft (10) to the output shaft (16). 12 . A bicycle having a drive device according to claim 1 , and an output element which can be driven by the drive device.

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