Printed circuit board device and production method

Abstract

The proposed solution relates to a printed circuit board device for a drive unit for an electric bicycle, having a printed circuit board with a first section having at least one electrical component which extends in a plane which is defined by a first normal vector, and a second section on which a sensor device for measuring a rotational speed of a drive shaft of the drive unit about an axis of rotation is arranged and which extends in a plane which is defined by a second normal vector. The second section is arranged relative to the first section such that the second normal vector encloses a larger angle to the axis of rotation than the first normal vector.

Description

[0001] Printed circuit board fixture and manufacturing process

[0002] Description

[0003] The proposed solution relates to a printed circuit board device according to claim 1, a drive unit according to claim 12, an electric bicycle according to claim 13 and a manufacturing method according to claim 14.

[0004] As is well known, electric bicycles have a drive unit that provides additional power to assist the rider, supplementing the pedaling power applied by the e-bike's rider. The e-bike is then propelled by both the pedaling power and the additional drive power. The pedaling power and / or the additional drive power can be delivered via a drive shaft. The operation of the drive unit can be controlled, for example, by the rotational speed and / or torque of the drive shaft. The rotational speed can be expressed, for instance, as a rate of rotation or an angular velocity.

[0005] The drive unit typically includes a sensor device, particularly for measuring the rotational speed. This sensor device can, for example, interact with a counterpart attached to the drive shaft to measure the rotational speed. To increase measurement precision, it is desirable to position the sensor device as close as possible to the drive shaft.

[0006] Such a sensor device is typically mounted on a printed circuit board (PCB), which may also house other necessary electrical connection components in addition to the sensor device itself. One way to position the PCB is to orient it in a plane perpendicular to the drive shaft's axis of rotation. With this arrangement, minimizing the distance between the sensor device and the drive shaft is challenging. Optimizing the axial distance (along the axis of rotation) can be partially achieved by using a sensor device that protrudes from the PCB along the axis of rotation. This can be accomplished by using long contact pins (over 5 mm in length), creating a so-called sensor tower on the PCB.Such a sensor device can be manufactured primarily by connecting it to the printed circuit board (PCB) and then soldering the two components (through-hole technology; THT). However, the sensor's protrusion from the PCB is limited to a maximum mounting height (typically to contact pins up to 20 mm long). Another way to position the PCB is to orient it in a plane parallel to the axis of rotation of the drive shaft. This arrangement is particularly suitable for small (axially) PCBs because the installation space along the axis of rotation is limited. With such a PCB arrangement, the radial distance between the PCB and the drive shaft can be very small, allowing the sensor device to be positioned to optimize the measurement of the drive shaft and its corresponding counterpart.Furthermore, a printed circuit board for such an arrangement with the sensor device can be manufactured by placing the sensor device onto the circuit board (without connecting it) and then baking it in a heating device (surface-mount technology; SMT). SMT is generally not suitable when using very long contact pins because no permanent connection is made before baking. However, the use of SMT offers cost savings compared to the use of through-hole technology (THT).

[0007] Against this background, the proposed solution is based on the task of providing a printed circuit board device with a sensor device that is inexpensive to manufacture and enables precise measurement of the rotational speed.

[0008] According to a first aspect of the proposed solution, the problem is solved by a printed circuit board device for a drive unit of an electric bicycle. The circuit board comprises a first section with at least one electrical component, extending in a plane defined by a first normal vector, and a second section on which a sensor device for measuring the rotational speed of a drive shaft of the drive unit about an axis of rotation is arranged. This second section extends in a plane defined by a second normal vector. The second section is arranged relative to the first section such that the second normal vector forms a larger angle with the axis of rotation than the first normal vector. The first and second sections can be arranged in different planes that are perpendicular to each other (i.e., not parallel).For example, the first normal vector can be parallel to the axis of rotation, and the second normal vector can be at an angle greater than zero to the axis of rotation. Such an adjustment of the second section relative to the first section can be used to position a surface of the second section equipped with the sensor device closer to the drive shaft than would be possible with an angle of zero to the axis of rotation. The proximity of the sensor device to the object being measured, i.e., the drive shaft (to be measured), can enable a more precise measurement of the rotational speed. The measurement can also be more robust due to this proximity, as external (potentially interfering) influences have a weaker effect.Furthermore, the sensor device can be positioned at a greater distance from the first section by arranging it on the second section than is possible by extending the contact pins of the sensor device, via which at least one sensor of the sensor device can be attached to the circuit board. In particular, the distance of the sensor device to the first section along the axis of rotation can be more than 20 mm, and especially more than 21 mm. The second section can project from the first section in a tongue-like shape to achieve this. In particular, the second section can be longer along the direction in which it projects from the first section than in the direction perpendicular to it.

[0009] In one embodiment, the second normal vector forms an angle between 80° and 110°, particularly between 90° and 100°, with the axis of rotation. In principle, the second section can be positioned with the smallest distance to the drive shaft if the normal vector forms an angle of 90° with the axis of rotation. The second section then extends in a plane parallel to the axis of rotation. Furthermore, an angle between 90° and 100° with the axis of rotation can optimize the installation space required for the second section and the sensor device. In particular, radial installation space can be optimized with such an angle.

[0010] A further advantage of the proposed solution is that the circuit board design, with its first and second sections, allows for the arbitrary specification of the angle between the second normal vector and the axis of rotation. This enables the optimal distance between the sensor device and the drive shaft to be freely selected. The optimal distance can be determined, for example, by the signal-to-noise ratio of the rotational speed measurement. In one embodiment, the first and second sections are integrally joined. Thus, the two sections can be parts of a single circuit board, which can be manufactured together in a single process. This manufacturing process can be more cost-effective than producing separate circuit boards for the at least one electrical component and the sensor device (partly because SMT can be used).

[0011] In one embodiment, the printed circuit board has a connecting section through which the first and second sections are joined. The connecting section can be thinner than the first and second sections. This thinner section, compared to the thickness of the first and second sections, can include a thinner section along the normal vectors. For example, the connecting section can be less than 1 mm thick, particularly less than 0.5 mm (i.e., a few hundred pm).

[0012] In principle, the first and second sections can be directly adjacent to each other. However, it can be advantageous to include a connecting section between them. This connecting section can act as a hinge, allowing the sections to pivot relative to each other (about a bending axis perpendicular to the axis of rotation). Thus, the two sections can be connected via the connecting section in such a way that they are flexibly adjustable relative to each other. The connecting section can be flexible and, in particular, can take the form of a rigid hinge.

[0013] In one embodiment, the connecting section is formed by a recess in the printed circuit board. This recess can be created by milling one side of the circuit board. The recess can be rectangular in shape.

[0014] In one embodiment, the recess is arranged on a side of the circuit board facing away from the axis of rotation. This can enable the recess to be manufactured in a way that protects the side equipped with the at least one electrical component and the sensor device.

[0015] In one embodiment, the first section extends in a ring shape around the axis of rotation. In principle, the first section can extend around the axis of rotation, at least partially. A ring-shaped, i.e., closed, extension around the axis of rotation, on the other hand, allows for the arrangement of one or more turns of a coil around the axis of rotation on the first section. The at least one electrical component can comprise such a coil (or any other configuration of an electrical coil). The coil can be used to measure the torque of the drive shaft.

[0016] In one embodiment, the printed circuit board device includes a holding device with a bracket to which the second section is attached. The bracket allows the angle of the second normal vector to the axis of rotation to be defined. In particular, the second section can be fixed to the bracket. This enables stable measurements of the rotational speed by the sensor device. The bracket can, for example, have a receptacle in which the second section is received. The second section can be attached to the bracket, for example, by positive locking and / or friction locking.

[0017] In one embodiment, the holder is arranged on a mounting base of the holding device. The first section of the printed circuit board can be supported on the mounting base, so that the second section is held relative to the first section by the holding device. In principle, the holding device can also be supported on another component of the drive device to hold the second section. Supporting the second section relative to the first section can, in particular, enable the printed circuit board fixture to be designed with tight tolerances. The holder can, for example, project from the mounting base in one direction along the mounting base or at a small angle (up to 10°) to the axis of rotation (whereby a tip of the holder facing away from the mounting base can be radially further away from the axis of rotation than a foot of the holder by which it is mounted on the mounting base).In particular, the bracket may protrude on one side of the holding device that faces away from the first section. The holding base and the bracket may be manufactured as a single piece. For example, the holding device may be made of plastic.

[0018] In one embodiment, the holding base extends at least partially around the axis of rotation. This allows for a robust arrangement of the holding device within the drive unit. Furthermore, it provides better support for the first section. In particular, the holding base can be designed to support the first section uniformly in every direction around the axis of rotation. For this purpose, the holding base can extend in a ring shape around the axis of rotation.

[0019] In one embodiment, the at least one electrical component comprises a torque detection device for measuring the torque of the drive shaft, a storage device, and / or a processor device. The at least one electrical component can therefore, in principle, include at least one electronic component (such as the processor device). The torque detection device can, for example, include at least one electrical coil for supplying energy to a torque sensor (on the drive shaft) and / or for communication with the torque sensor. The at least one coil can extend around the axis of rotation in its first section. In this respect, the first section can be a section for accommodating a torque detection device or a part thereof.The first section can, in principle, include a torque processor device for evaluating data provided by the torque detection device, in addition to the torque detection device.

[0020] It is conceivable and possible that the circuit board represents a mainboard of the drive unit. For example, it can have at least one (main) processor of the drive unit and / or a (main) memory device. The main processor can, for example, be configured to evaluate data from a multitude of sensor devices and / or detection devices. The main memory device can, for example, be configured to store data from a multitude of sensor devices and / or their evaluation results.

[0021] According to a second aspect of the proposed solution, a drive unit for propelling an electric bicycle is provided, comprising a drive shaft through which a driving force generated by the drive unit can be transmitted to the electric bicycle. The drive unit further includes a counter element that interacts with a printed circuit board device, as described in the first aspect of the proposed solution, to measure the rotational speed of the drive shaft.

[0022] The counter element can be located on the drive shaft. Suitable counter elements include a magnetic ring or a timing disc. The sensor device for measuring the rotational speed can be configured and designed to detect the (rotational) position and / or rotation rate of the counter element in order to determine the rotational speed of the drive shaft. In principle, the sensor device can measure the rotational speed magnetically, optically, inductively, or capacitively.

[0023] The drive unit according to the second aspect of the proposed solution can exhibit the features and advantages described in connection with the first aspect of the proposed solution.

[0024] A third aspect of the proposed solution concerns an electric bicycle with a drive unit according to the second aspect of the proposed solution.

[0025] A fourth aspect of the proposed solution concerns a manufacturing process for producing a printed circuit board device. The process comprises the following steps:

[0026] Providing a printed circuit board with a first section and a second section in a first plane defined by a first normal vector,

[0027] - Arranging at least one electrical component on the first section,

[0028] - Arranging a sensor device for measuring the rotational speed of a drive shaft of the drive unit about an axis of rotation on the second section and

[0029] Adjusting the second section relative to the first section into a second plane different from the first plane, defined by a second normal vector, such that the second normal vector forms a larger angle to the axis of rotation than the first normal vector.

[0030] The first and second sections can thus be arranged in a common plane before the at least one electrical component and / or the sensor device for measuring the rotational speed are mounted on the circuit board. Such a sequence of process steps can have the advantage that the mounting can be carried out using the relatively cost-effective surface-mount technology (SMT), in which the elements to be connected to the circuit board are placed on it and then electrically connected to the circuit board together by heating the board. The adjustment of the second section relative to the first section can then take place, i.e., once these elements are electrically connected to the circuit board.

[0031] In one embodiment, before adjusting the second section relative to the first section, the thickness of a connecting section of the printed circuit board (PCB) linking the first and second sections is reduced (e.g., by milling). This reduction can be performed before or after the placement of the at least one electrical component and / or the sensor device. Particularly if the reduction is performed from a side of the PCB facing away from the at least one electrical component and / or the sensor device, these elements can be better protected from potential damage. Furthermore, at least one electrical conductor and / or at least one metal layer made of a metal such as copper can then be arranged on the connecting section on the side facing these elements.The at least one electrical conductor and / or the at least one metal layer can therefore be arranged on a side of the connection section that does not need to be machined, e.g. by milling, when reducing the thickness (along the axis of rotation or perpendicular to the desired bending axis).

[0032] The features and advantages described in connection with the first, second and third aspects of the proposed solution also apply to the manufacturing process according to the fourth aspect.

[0033] The attached figures illustrate exemplary implementations of the proposed solution.

[0034] Here they show

[0035] Figure 1 shows a view of an electric bicycle;

[0036] Figures 2A to 20 show different arrangements of a

[0037] Counter element relative to a sensor device;

[0038] Figure 3 shows a perspective view of an arrangement of

[0039] Printed circuit board relative to an axis of rotation;

[0040] Figure 4 shows a sectional view through a drive unit for a

[0041] Electric bicycle with a circuit board according to the embodiment shown in Figure 3;

[0042] Figure 5 is a perspective view of a printed circuit board with a first and a second section; Figure 6 is a perspective view of a bottom side of a printed circuit board with a first and a second section; and

[0043] Figure 7 shows a sectional view through a drive unit for a

[0044] Electric bicycle with a circuit board having a first and a second section.

[0045] Figure 1 shows an electric bicycle F with two wheels (a front wheel V and a rear wheel H). A rider can apply power to propel the electric bicycle F by pedaling the drive shaft W via crank elements K with attached pedals P. The pedaling power, as well as additional drive power generated by at least one drive motor, is transmitted via a drive train S to the rear wheel H to propel the electric bicycle F.

[0046] The rotational speed of the drive shaft W of the electric bicycle F is measured by a sensor device 2. A counter element 4 is provided on the drive shaft W for measuring the rotational speed. By measuring the (rotational) position and / or rotation rate of the counter element 4 with the sensor device 2, the rotational speed of the drive shaft W can be determined.

[0047] Figures 2A to 20 show different arrangements of the sensor device 2 relative to the counter element 4. Here, the counter element 4 is designed as a magnetic ring. Alternatively, the rotational speed can be measured with a counter element 4 that enables inductive, optical, or capacitive coupling with the sensor device 2. The sensor device 2 comprises one sensor element 20 and four to six contact pins 21, via which the sensor element 20 is connected to the circuit board 1. In principle, the sensor device 2 can have one or more sensor elements 20 and / or a plurality of contact pins 21.

[0048] Figure 2A shows a view of an arrangement in which the sensor device 2 is mounted on a printed circuit board 1 extending in a plane parallel to the axis of rotation R. Such an arrangement allows the use of surface-mount technology (SMT), a cost-effective method, for connecting the sensor device 2 to the printed circuit board 1. Figure 2B shows an arrangement in which the sensor device 2 is mounted on a printed circuit board 1 extending in a plane perpendicular to the axis of rotation R. In such an arrangement, the signal by which the sensor device 2 detects the counter element 4 may be too weak to measure the rotational speed precisely and with minimal interference. This arrangement also allows the use of SMT.

[0049] Figure 20 shows an arrangement in which the sensor device 2 is mounted on a printed circuit board 1, which extends in a plane perpendicular to the axis of rotation R. The sensor device 2 comprises contact pins 21 (e.g., with a length of 15 mm) through which the sensor element 20 is connected to the printed circuit board 1. Due to the length of the contact pins 21, the sensor device 2 projects from the printed circuit board 1 along the axis of rotation R. By positioning the sensor element 20 at a distance from the printed circuit board 1, any potential lack of installation space for the printed circuit board 1 near the mating element 4 can be compensated for. The sensor element 20 is thus positioned closer to the mating element 4 than the printed circuit board 1 itself. However, the contact pins 21 cannot be of arbitrarily long lengths without impairing the function of the sensor device 2.The long contact pins necessitate the use of through-hole technology (instead of SMT) for the manufacture of such a device, which can increase manufacturing costs.

[0050] If the design of the drive unit A therefore requires that the counter element 4 has a large distance along the axis of rotation R from the circuit board 1, measuring the rotational speed may be difficult.

[0051] Figures 3 and 4 show a view of a solution in which, in addition to a printed circuit board T comprising a processor device 101 and a storage device 102 (exemplified on a lower side of the printed circuit board T), an additional printed circuit board 1 is provided on which the sensor device 2 for measuring the rotational speed of the drive shaft W is arranged. A holding device 3 is provided for the additional printed circuit board 1, to which the additional printed circuit board 1 is attached and through which an electrical connecting line L to the printed circuit board 1 with the processor device 101 and the storage device 102 is routed. The additional printed circuit board 1 allows the sensor device 2 to be positioned close to the counterpart element 4. However, the electrical connecting line L and the design of the holding device 3 for its routing require a relatively large amount of installation space.Figure 5 shows a perspective view of a printed circuit board device with a circuit board 1 having a first section 11 containing an electrical component in the form of part of a torque detection device 103, which extends in a plane defined by a first normal vector N1. The circuit board 1 has a second section 12 on which a sensor device 2 for measuring the rotational speed of a drive shaft W of the drive unit A about an axis of rotation R is arranged. The second section 12 extends in a plane defined by a second normal vector N2. The second section 12 is arranged relative to the first section 11 such that the second normal vector N2 forms a larger angle with the axis of rotation R than the first normal vector N1.

[0052] The first normal vector N1 is arranged parallel to the axis of rotation R. In principle, the first normal vector N1 can form a small angle with the axis of rotation R (for example, 1° or 2°). The torque detection device 103 can be used for wireless power supply and for acquiring and evaluating data from a torque sensor (on the drive shaft W). For power supply, the torque detection device 103 can have a coil with at least one turn, arranged on the first section 11 and extending around the axis of rotation R. In such a torque detection device 103, it may be desirable for the angle of the first normal vector N1 to the axis of rotation R to be as small as possible in order to maximize the coil's inductance. The second normal vector N2 is arranged at an angle of greater than 90° to the first normal vector.A tip of the second section 12 is therefore at a greater distance from the axis of rotation R than a foot opposite the tip, via which the second section 12 is arranged on the first section 11 (here via a connecting section 13). In principle, the angle of the second section 12 to the axis of rotation R is freely selectable.

[0053] The first section 11 is formed in an annular shape around the axis of rotation R. A recess 110 is provided on a side of the first section 11 facing the axis of rotation R, in which the second section 12 is arranged. The recess 110 extends radially to the axis of rotation R. The second section 12 is connected to the first section 11 via a connecting section 13. A gap is provided between the connecting section 13 and the recess 110 on both sides of the connecting section 13 in the circumferential direction to allow adjustment of the connecting section 13 without the adjustment causing it to jam against the recess. The connecting section 13 and the second section 12 have identical widths along the circumferential direction. The length of the connecting section 13 is greater than the radial depth of the recess 110 on the first section 11 from which the connecting section 13 projects.This allows the second section 12 (at least with the foot) to protrude radially inwards from the first section 11 even if the second normal vector N2 makes a larger angle to the axis of rotation R than the first normal vector N1 (i.e., even after adjustment).

[0054] The first section 11 is arranged on a holding base 32 of a holding device 3. The holding base 32 extends in a ring shape around the axis of rotation R. Along the axis of rotation R, the first section 11 is arranged on a first side of the holding base 32 (in Fig. 5, on the top side). This section is secured against rotation on the holding device 3 by means of optional pins 320 that engage with the first section 11. A bracket 31 for the second section 12 also extends along the axis of rotation R from the first side of the holding base 32 to a second side of the holding base 32 (in Fig. 5, the underside). The bracket 31 projects beyond this second side. The bracket 31 has a U-shaped cross-section along the axis of rotation R, allowing the second section 12 to be received within it. In particular, the second section 12 can be clamped to the bracket 31.This clamping can be carried out during the mounting of the circuit board 1 on the holding device 3, thus enabling rapid assembly. Alternatively, the second section 12 can be secured to the holder 31 via any other connection. For example, a positive-locking connection is conceivable and possible.

[0055] Figure 6 shows a perspective view of a printed circuit board 1 from a bottom side. At least one electrical component 101, 102, 103 and the sensor device 2 for measuring the rotational speed of the drive shaft W can be arranged on the top side. The bottom side is the side facing away from the top side. A recess 130 is provided on the bottom side of the connecting section 13 between the first and second sections 11, 12. This recess allows the connecting section 13 to be flexible, enabling the second section 12 to be adjustable relative to the first section 11 about a bending axis B transverse to the axis of rotation R. Due to the recess 130, the thickness D3 of the connecting section 13 is less than the respective thicknesses of the first and second sections D1, D2. The reduced thickness D3 of the connecting section 13 can be produced in any desired manner.The introduction of a recess 130 is a particularly cost-effective option here. For the fabrication of the printed circuit board (PCB) device, the at least one electrical component 101, 102, 103 and the sensor device 2 can be arranged on the PCB 1 (for example, by a cost-effective method such as SMT), with the entire PCB 1 extending along a single plane. In a second step, the second section 12 can be adjusted relative to the first section, in particular by bending. The recess 130 can be introduced into the PCB 1 before the first or before the second step. The thickness of the connecting section 13 can be reduced to a few hundred pm, for example, by milling.

[0056] Figure 7 shows a sectional view through a drive unit A with a printed circuit board device, which is configured according to the embodiment shown in Figure 5. The torque detection device 103 is arranged on the first section 11 by way of example. Additionally, a processor device 101 and a storage device 102 are (optionally) arranged on the first section 11. The first normal vector N1 is arranged parallel to the axis of rotation R of the drive shaft. The second normal vector N2 is arranged at an angle J of 96° to the axis of rotation R. In principle, the second normal vector N2 can be arranged at an angle J between 80° and 110° to the axis of rotation R. The sensor device 2 is arranged at an end of the second section 12 spaced apart from the connecting section 13 (approximately 20 to 30 mm, in particular 25 mm, axially from the first section 11).This results in the sensor device 2 having a maximum axial distance to the first section 11 (limited by the length of the second section 12). The second section 12 can thus project from the first section 11 along the axis of rotation R, saving installation space. This allows the sensor device 2 to be positioned on a counter element 4, which is arranged axially spaced from the first section 11. Due to the flexibility of the connecting section 13, the distance between the sensor device 2 and the counter element 4 can be set as needed to enable the most precise measurement of the rotational speed possible (with a sufficiently high signal-to-noise ratio). The distance can be determined by the design of the mounting device 3 and, in particular, by the angle of the mounting 31 to the axis of rotation R. This angle can correspond to the angle J between the second normal vector N2 and the axis of rotation R.Furthermore, the length of the second section 12 can be varied within a wide range to meet any required installation space specifications. Reference symbol list.

[0057] 1, 1' printed circuit board

[0058] 101 Processor device

[0059] 102 Storage device

[0060] 103 Torque detection device

[0061] 11 first section

[0062] 12 second section

[0063] 13 Connecting section

[0064] 110 recess

[0065] 130 In-depth study

[0066] 2 Sensor device

[0067] 20 sensor elements

[0068] 21 contact pins

[0069] 3 Holding device

[0070] 31 bracket

[0071] 32 Mounting base

[0072] 320 cones

[0073] 4 Counter element

[0074] A drive unit

[0075] B bending axis

[0076] Thickness

[0077] F Electric bicycle

[0078] H Rear wheel

[0079] J angle

[0080] K crank

[0081] L connection line

[0082] N1 first normal vector

[0083] N2 second normal vector

[0084] P Pedal

[0085] R axis of rotation

[0086] S Powertrain

[0087] V front wheel

[0088] W drive shaft

Claims

Claims 1. Printed circuit board device for a drive unit (A) for an electric bicycle (F), with - a printed circuit board (1) with a first section (11) with at least one electrical component (101 , 102, 103) which extends in a plane defined by a first normal vector (N1), and - a second section (12) on which a sensor device (2) for measuring a rotational speed of a drive shaft (W) of the drive unit (A) about an axis of rotation (R) is arranged and which extends in a plane defined by a second normal vector (N2), characterized in that the second section (12) is arranged relative to the first section (11) such that the second normal vector (N2) encloses a larger angle (J) to the axis of rotation (R) than the first normal vector (N1).

2. Printed circuit board device according to claim 1, characterized in that the second normal vector (N2) encloses an angle (J) between 80° and 110°, in particular between 90° and 100°, to the axis of rotation (R).

3. Printed circuit board device according to one of claims 1 and 2, characterized in that the first and the second section (11 , 12) are integrally connected.

4. Printed circuit board device according to one of claims 1 to 3, characterized in that the printed circuit board (1) has a connecting section (13) via which the first and the second section (11 , 12) are connected to each other and which has a lesser thickness (D3) than the first and the second section (11 , 12).

5. Printed circuit board device according to claim 4, characterized in that the connecting section (13) is formed by a recess (130) in the printed circuit board (1).

6. Printed circuit board device according to claim 5, characterized in that the recess (130) is arranged on a side of the printed circuit board (1) facing away from the axis of rotation (R).

7. Printed circuit board device according to one of the preceding claims, characterized in that the first section (11) extends in a ring shape around the axis of rotation (R).

8. Printed circuit board device according to one of the preceding claims, characterized by a holding device (3) with a holder (31) on which the second section (12) is held.

9. Printed circuit board device according to claim 8, characterized in that the holder (31) is arranged on a holding base (32) of the holding device (3), via which the printed circuit board (1) with its first section (11) is supported on the holding device (3), so that the second section (12) is held relative to the first section (11) via the holding device (3).

10. Printed circuit board device according to claim 9, characterized in that the holding base (32) extends at least sectionally around the axis of rotation (R).

11. Printed circuit board device according to one of the preceding claims, characterized in that the at least one electrical component (101 , 102, 103) comprises a sensor device (2) for measuring a torque of the drive shaft (W), a storage device (102) and / or a processor device (101).

12. Drive unit (A) for driving an electric bicycle (F) with a drive shaft (W) via which a drive force generated by the drive unit (A) can be transmitted to the electric bicycle (F), and a counter element (4) which interacts with a printed circuit board device according to one of claims 1 to 11 for measuring a rotational speed of the drive shaft (W).

13. Electric bicycle (F) with a drive unit (A) according to claim 12.

14. Manufacturing process for a printed circuit board device for a drive unit (A) for an electric bicycle (F), comprising the steps: - Providing a printed circuit board (1) with a first section (11) and a second section (12) in a first plane defined by a first normal vector (N1), - Arranging at least one electrical component (101 , 102 , 103) on the first section (11), - Arranging a sensor device (2) for measuring a rotational speed of a drive shaft (W) of the drive unit (A) about a rotational axis (R) on the second section (12) and - Adjusting the second section (12) relative to the first section (11) into a second plane different from the first plane, defined by a second normal vector (N2), such that the second normal vector (N2) encloses a larger angle (J) to the axis of rotation (R) than the first normal vector (N1).

15. Manufacturing method according to claim 14, characterized in that, prior to adjusting the second section (12) relative to the first section (11), a thickness (D3) of a connecting section (13) of the printed circuit board (1), via which the first and the second section (11 , 12) are connected, is reduced.

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