Apparatus for determining a torque on a shaft, power take-off transmission with a power take-off shaft, and work machine

Abstract

The invention relates to an apparatus (100) for determining a torque on a shaft (110), comprising the shaft (110) for transmitting the torque, a first signal generator (120) arranged for conjoint rotation on the shaft (110), a second signal generator (130) spaced apart from the first signal generator (120) and arranged for conjoint rotation on the shaft (110), a first sensor (121) assigned to the first signal generator (120) and intended to generate first measurement data, a second sensor (131) assigned to the second signal generator (130) and intended to generate second measurement data, and a control unit, wherein the control unit is designed to determine torsion of the shaft (110) on the basis of the first and the second measurement data, and wherein the control unit is also designed to determine the torque on the basis of the torsion. The apparatus (100) according to the invention is distinguished by the fact that the first signal generator (120) is in the form of a first clutch case (120) and the second signal generator (130) is in the form of a second clutch case (130). The invention also relates to a power take-off transmission with a power take-off shaft and to a corresponding work machine.

Description

[0001] Device for determining a torque on a shaft, power take-off gear with a power take-off shaft and working machine

[0002] The present invention relates to a device for determining a torque on a shaft according to the preamble of claim 1 as well as a corresponding power take-off gear with a power take-off shaft and a corresponding work machine.

[0003] In the prior art, power take-off shafts are known, particularly for agricultural machinery, which enable the drive of implements that can be coupled to the machine. Examples of such drivable implements include mowers, straw balers, or fertilizer spreaders. Furthermore, ground speed PTOs are also known, also for agricultural machinery, which enable the drive of drivable trailers that can be coupled to the machine. The output speed and the output torque of both the known PTOs and the known ground speed PTOs are usually determined by the engine speed or the engine torque of an engine of the agricultural machine. Gear units connected upstream of the PTOs often also have several switchable gear stages, which determine the engine speed or the engine torque and the output speed orset the output torque of the PTO shaft in an adjustable ratio.

[0004] In this context, DE 10 2017 108 307 A1 describes a device for measuring torque on a rotatably mounted shaft, wherein the shaft is connected to a hub by a radially positive, non-positive, or materially bonded connection. At least one measuring element made of magnetizable steel is arranged between the shaft and the hub. The device further comprises electronics for detecting the magnetic field of the measuring element, wherein the application of a torque to the shaft leads to a change in the magnetic field and thus the torque can be calculated from the change in the magnetic field. US 8 079 274 B2 discloses a system for measuring the torque on a shaft. Two signal-generating magnetic rings are arranged on the shaft in a rotationally fixed manner and axially spaced from one another. The magnetic rings have alternating magnetic south poles and magnetic north poles along their outer circumference.Using a sensor, the rotational movement of each of the magnetic rings can be measured. By comparing the waveform of the measurement signals generated by the movement of the magnetic rings, the torsion of the shaft and thus the torque transmitted by the shaft can be determined.

[0005] JP 6 372 231 B2 describes a method for measuring the torque on a shaft. Magnetic encoder wheels with repeatedly changing magnetic properties are arranged axially spaced apart on the shaft. Each encoder wheel is assigned a sensor that detects the magnetic properties of the encoder wheels. The torque transmitted by the shaft can then be calculated based on a pulse edge time difference of the measurement signals due to shaft torsion.

[0006] US 8,666,682 B2 discloses a device for measuring a torque transmitted by a rotating element that rotates relative to a fixed element about a longitudinal axis. The device comprises a first torsion reference element fixedly coupled to the shaft at a first axial position and a second torsion reference element fixedly coupled to the shaft at a second axial position.The device further comprises a first detector coupled to a fixed element and configured to detect the passage of the first torsional reference element at the first detector upon each complete rotation of the shaft and to generate a first signal upon each passage of the first torsional reference element, and a second detector coupled to the fixed element and configured to detect the passage of the second torsional reference element at the second detector upon each complete rotation of the shaft and to generate a second signal upon each passage of the second torsional reference element. A controller is configured to calculate a phase difference between the first signal and the second signal relative to a time reference during rotation of the rotating element under a torsional load and to compare the phase difference to a reference value.The controller then calculates the torque load from a ratio of the phase difference and the reference value.

[0007] However, the known methods and devices for torque detection via torsion of the shaft transmitting the torque are disadvantageous in that they are comparatively complex to implement.

[0008] It is an object of the invention to propose an improved device for determining a torque on a shaft.

[0009] This object is achieved according to the invention by the device for determining a torque on a shaft according to claim 1. Advantageous embodiments and further developments of the invention emerge from the dependent claims.

[0010] The invention relates to a device for determining a torque on a shaft, comprising the shaft for transmitting the torque, a first signal transmitter arranged on the shaft in a rotationally fixed manner, a second signal transmitter arranged on the shaft in a rotationally fixed manner and spaced from the first signal transmitter, a first sensor assigned to the first signal transmitter for generating first measurement data, a second sensor assigned to the second signal transmitter for generating second measurement data and a control unit, wherein the control unit is designed to determine a torsion of the shaft based on the first and second measurement data and wherein the control unit is further designed to determine the torque based on the torsion.

[0011] The invention therefore describes a device designed to determine a torque transmitted via a shaft. The shaft can, for example, be arranged in a transmission and, in particular, be a component of the transmission. The transmission can, for example, be a transmission of a motor vehicle, advantageously a transmission of an agricultural work machine or a construction machine. The shaft preferably transmits a drive torque of a drive unit, for example, an internal combustion engine or an electric motor, to an output of the transmission.

[0012] Due to the torque transmitted through the shaft, the shaft experiences a torsion proportional to the transmitted torque. The torsion of the shaft can therefore be used as a measure of the transmitted torque.

[0013] Furthermore, the torsion of the shaft also depends on the shaft's torsion spring constant and the shaft's length. The longer the shaft, the greater the torsion.

[0014] A first signal transmitter and a second signal transmitter are arranged on the shaft and are spaced apart from one another. Advantageously, the first and second signal transmitters are spaced apart over a large part of the axial length of the shaft. In other words, this means that the first signal transmitter is arranged in the region of a first axial end of the shaft, and the second signal transmitter is arranged in the region of a second axial end of the shaft. The axial distance between the first signal transmitter and the second signal transmitter is preferably at least 30 cm, particularly preferably at least 50 cm, and most particularly preferably at least 65 cm.

[0015] Since the first and second signal transmitters are each arranged on the shaft in a rotationally fixed manner, they accordingly follow a rotational movement of the shaft as well as a torsional movement on the shaft.

[0016] The first and second signal generators are each designed to provide a signal describing the rotational movement or the torsional movement, respectively. These signals can, in principle, be mechanical, electrical, magnetic, or optical signals.

[0017] The first sensor is assigned to the first signal generator in such a way that it can detect the signals provided by the first signal generator and generate the first measurement data from them. The first measurement data describes the signals detected by the first signal generator over time.

[0018] In a similar manner, the second sensor is assigned to the second signal generator in such a way that it can detect the signals provided by the second signal generator and generate the second measurement data from them. The second measurement data describes the signals detected by the second signal generator over time.

[0019] The control unit is advantageously designed as an electronic control unit which is connected at the data level to the first and the second sensor in order to receive the first and the second measurement data therefrom.

[0020] According to the invention, it is provided that the first signal generator is designed as a first clutch bell and the second signal generator is designed as a second clutch bell.

[0021] This results in the advantage that components already present in the drive train can be used in the form of the clutch bells, so that the implementation costs for the device according to the invention in a drive train are comparatively low.

[0022] The invention recognizes that the first clutch bell and the second clutch bell are also very well suited as signal transmitters for determining torque, since torque is only transmitted via the shaft when the first and second clutches are engaged. And whenever the first and second clutches are engaged, the first clutch bell and the second clutch bell are connected to the shaft in a rotationally fixed manner and rotate at the same speed as the shaft.

[0023] According to a preferred embodiment of the invention, it is provided that the first sensor senses an outer circumference of the first signal generator, wherein the first signal generator has signal-generating and non-signal-generating sections on its outer circumference, wherein the signal-generating and non-signal-generating sections are distributed asymmetrically over the outer circumference of the first signal generator and / or that the second sensor senses an outer circumference of the second signal generator, wherein the second signal generator has signal-generating and non-signal-generating sections on its outer circumference, wherein the signal-generating and non-signal-generating sections are distributed asymmetrically over the outer circumference of the second signal generator.

[0024] The presence and in particular the alternating arrangement of signal-generating and non-signal-generating sections on the first and second signal generators respectively enables the sensing of a rotary movement of the first and second signal generators respectively to be made very reliable.

[0025] The first sensor's detection zone is directed toward the outer circumference of the first clutch bell housing, allowing it to detect the signal-generating sections rotating there on the outer circumference. During a rotational movement, the rotational movement can be detected by the alternation of signal-generating and non-signal-generating sections within the detection zone of the first sensor.

[0026] The speed of the shaft can also be advantageously determined based on the speed of the alternation between sensed signal-generating sections and non-signal-generating sections.

[0027] The non-signal-generating sections are not sensed by the first sensor, as they are not detectable by it. Thus, the time interval between the sensing of two signal-generating sections can be used as a particularly advantageous measure of the shaft's speed. Alternatively or additionally, the time interval between the non-sensing of two non-signal-generating sections can also be used as a measure of the shaft's speed.

[0028] In a similar way, a rotational movement or a speed of the shaft can be detected by the second sensor. Because the signal-generating and non-signal-generating sections are distributed asymmetrically rather than uniformly over the outer circumference of the first clutch bell housing and the second clutch bell housing, the angular position of the shaft can also be determined. The asymmetrical design of the signal-generating and non-signal-generating sections allows each section to be individually configured, so that by sensing and detecting a specific individual section and based on its known arrangement on the outer circumference, a conclusion can be drawn about the angular position of the corresponding clutch bell housing and thus about the shaft.It is advantageous to use a clutch bell which is connected to the shaft in a rotationally fixed manner even when the clutch assigned to it is open, so that the rotational orientation of the clutch bell to the shaft is identical and known at all times.

[0029] The asymmetric design is advantageous in that it has an asymmetry in the circumferential width of the sections, ie asymmetrically distributed sections are of different lengths on the outer circumference of the corresponding clutch bell.

[0030] According to a further preferred embodiment of the invention, it is provided that the signal-generating sections are material-based and the non-signal-generating sections are material recesses.

[0031] This means that the first sensor or the second sensor can detect the presence of material from the first sensor or the second sensor, respectively. The outer circumference of the first sensor or the second sensor can thus preferably be gear-shaped, with one tooth on the outer circumference being detected by the first sensor or the second sensor. The gap between two teeth is a material recess and is therefore not detected.

[0032] This represents a simple and equally reliable embodiment for representing signal-generating and non-signal-generating sections on the outer circumference of the first signal generator or the second signal generator. According to a further preferred embodiment of the invention, it is provided that the first clutch bell is made of steel and is assigned to a first multi-plate clutch and the second clutch bell is made of steel and is assigned to a second multi-plate clutch.

[0033] Steel as a material for the first or second signal transmitter offers the advantage of being comparatively easy and reliable to detect, for example, through its optical, magnetic, or electrical properties. Furthermore, steel is mechanically robust, making it suitable for the manufacture of highly stressed couplings or actuators.

[0034] Clutch bells are suitable.

[0035] By assigning the first and second clutch bells to a multi-plate clutch each, the shaft can be switched to transmit the torque at any differential speeds and loads.

[0036] According to a further preferred embodiment of the invention, it is provided that the first sensor is designed as a first Hall sensor and the second sensor is designed as a second Hall sensor.

[0037] Hall sensors enable very reliable sensing of magnetic fields and are therefore particularly suitable in conjunction with a signal generator made of a ferromagnetic material such as steel for sensing the signal-generating or non-signal-generating sections.

[0038] In addition, Hall sensors are comparatively inexpensive and compact.

[0039] According to a further preferred embodiment of the invention, it is provided that the first measurement data contain a transition from a signal-generating section to a non-signal-generating section, or vice versa, at the first signal generator, and that the second measurement data contain a transition from a signal-generating section to a non-signal-generating section, or vice versa, at the second signal generator. The transitions from a signal-generating section to a non-signal-generating section, or from a non-signal-generating section to a signal-generating section, enable a largely exact determination of the angular position of the first and second clutch bell housings, respectively, since the transitions—in contrast to the signal-generating and non-signal-generating sections as such—are sharp points on the outer circumference of the signal generators. This improves the precision with which the angular positions, the rotational speeds, and thus the torsion can be determined.

[0040] Advantageously, the first and second measurement data each contain a large number of different, consecutive transitions. This allows the rotational speed to be reliably determined from the temporal spacing of the recorded transitions. Furthermore, temporal changes in the torque transmitted by the shaft can be precisely detected at any time based on the changes in torsion.

[0041] According to a further preferred embodiment of the invention, it is provided that the control unit is designed to determine a rotational speed of the shaft based on a time duration between at least two transitions at the first signal generator and / or at the second signal generator.

[0042] As already described, the transitions from the signal-generating to the non-signal-generating sections, or vice versa, provide comparatively precise information about the angular positions of the first and second signal transmitters, respectively. Based on the time duration between two detected transitions at the first signal transmitter and the second signal transmitter, the shaft speed can thus be reliably determined.

[0043] As a rule, the speed determined by the first sensor is identical to the speed determined by the second sensor. Deviations between the speed determined by the first sensor and the speed determined by the second sensor can occur, particularly when the torque transmitted by the shaft changes, and thus the torsion of the shaft changes. When the torsion changes, the speed measured by the first sensor and the speed measured by the second sensor will naturally show a slight difference for a short time.

[0044] Advantageously, the control unit is configured to determine a shaft speed based on an average duration of the last ten detected transitions at the first signal generator and / or the second signal generator. This allows short-term detected speed fluctuations due to changes in the transmitted torque to be avoided.

[0045] Furthermore, the control unit advantageously assigns a time stamp to each detected transition. Thus, based on the time stamp, in particular based on a predeterminable number of transitions, for example, five, ten, or 15, the average rotational speed over this number of transitions can be determined.

[0046] According to a further preferred embodiment of the invention, it is provided that the control unit is designed to determine an angular position of the shaft based on a time duration between at least two transitions at the first signal generator and / or at the second signal generator.

[0047] Here, the invention makes particular use of the asymmetrical distribution of the signal-generating and non-signal-generating sections on the outer circumference of the first and second signal generators, respectively.

[0048] Advantageously, by taking the determined speed into account, it is possible to determine which individual signal-generating or non-signal-generating section is currently being detected by the first or second sensor. Using this information and the known angular position of the first or second sensor on the shaft, the angular position of the shaft can then be determined.

[0049] The angular position of the shaft can be used, for example, to determine the angular position of an interface between the shaft and an attachment that can be driven by the shaft. This can simplify the coupling of the attachment to the shaft. According to a further preferred embodiment of the invention, the control unit is designed to determine the rotational speed of the shaft and / or the angular position of the shaft based on a plurality of time periods.

[0050] This allows the effects of short-term fluctuations in the torque transmitted by the shaft to be compensated.

[0051] According to a further preferred embodiment of the invention, it is provided that the control unit has a processor dedicated to determining the torque and / or the speed.

[0052] This means that the control unit contains a processor dedicated exclusively to determining torque or speed. This allows the torque or speed to be determined without delay at any time and regardless of the current computing load in the control unit through other processes processed by a main processor.

[0053] The processor dedicated to determining the torque or the speed is preferably a so-called co-processor.

[0054] The invention also relates to a power take-off transmission with a power take-off shaft, comprising a device according to the invention, wherein the device is designed to determine the torque on the power take-off shaft.

[0055] This results in the advantages already described in connection with the device according to the invention also being applicable to the auxiliary drive transmission according to the invention.

[0056] The invention also relates to a work machine comprising a power take-off transmission according to the invention. This results in the advantages already described in connection with the device according to the invention also being applicable to the work machine according to the invention.

[0057] The work machine is preferably a wheel loader, but it can also be a skid steer loader, telehandler, dumper, excavator, or tractor.

[0058] The invention is explained below by way of example using embodiments shown in the figures.

[0059] They show:

[0060] Fig. 1 shows, by way of example and schematically, a possible embodiment of a device according to the invention for determining a torque on a shaft,

[0061] Fig. 2 shows an example and schematically a possible embodiment of a first clutch bell,

[0062] Fig. 3. exemplary and schematically measured time periods of a transition from a signal-generating section of the first clutch bell to a non-signal-generating section of the first clutch bell or vice versa and

[0063] Fig. 4 shows, by way of example and schematically, a deviation from a target value for a time offset between an expected transition at the first clutch bell and an actual transition of the first clutch bell due to a torsion of the shaft.

[0064] Identical objects, functional units, and comparable components are designated by the same reference numerals throughout the figures. These objects, functional units, and comparable components are identical in terms of their technical features, unless explicitly or implicitly stated otherwise in the description. Fig. 1 shows, by way of example and schematically, a possible embodiment of a device 100 according to the invention for determining a torque on a shaft 110.

[0065] In addition to the shaft 110 for transmitting the torque, the device 100 also includes a first signal transmitter 120 arranged on the shaft 110 in a rotationally fixed manner, a second signal transmitter 130 arranged on the shaft 110 at a distance from the first signal transmitter 120 and rotationally fixedly arranged, a first sensor 121 associated with the first signal transmitter 120 for generating first measurement data, a second sensor 131 associated with the second signal transmitter 130 for generating second measurement data, and a control unit (not shown in Fig. 1). The first signal transmitter 120 is designed as a first clutch bell 120, and the second signal transmitter 130 is designed as a second clutch bell 130.

[0066] The control unit is designed to determine a torsion of the shaft 110 based on the first and second measurement data and further to determine the torque transmitted by the shaft 110 based on the torsion.

[0067] The shaft 110 is, for example, a power take-off shaft 110 of a power take-off transmission which comprises the device 100.

[0068] The power take-off gearbox is, for example, a power take-off gearbox of an agricultural work machine (not shown in Fig. 1).

[0069] The first sensor 121 is, for example, arranged and designed such that it senses an outer circumference of the first clutch bell 120, wherein the first clutch bell 120 has signal-generating and non-signal-generating sections on its outer circumference.

[0070] In a similar manner, the second sensor 131 is also arranged and configured, for example, to sense an outer circumference of the second clutch bell housing 130, with the second clutch bell housing 130 also having signal-transmitting and non-signal-transmitting sections on its outer circumference. The first clutch bell housing 120 and the second clutch bell housing 130 are made of steel, for example. The first sensor 121 and the second sensor 131 are, for example, Hall sensors 121, 131, which can sense the presence of steel, which has ferromagnetic properties.

[0071] The signal-transmitting sections of the first clutch bell 120 and the second clutch bell 130 are material-based. In the context of the invention, this means that material, i.e., steel, is present in these sections and there is no material recess.

[0072] Conversely, the non-signaling sections of the first clutch bell 120 and the second clutch bell 130 are designed as material recesses, ie, there is no material, i.e. no steel, in these sections.

[0073] For example, the signal-transmitting and non-signal-transmitting sections are each distributed asymmetrically over the outer circumference of the first clutch bell 120 and also of the second clutch bell 130. For the purposes of the invention, an asymmetric distribution means that successive signal-transmitting and non-signal-transmitting sections are of different sizes or lengths.

[0074] The first measurement data and the second measurement data recorded by the first sensor 121 and the second sensor 131 each contain, for example, the last ten transitions from a signal-generating section to a non-signal-generating section or vice versa.

[0075] The control unit assigns a timestamp to each transition in the first measurement data and in the second measurement data.

[0076] As a result, the control unit can determine a rotational speed of the shaft 110 based on a time duration between each two consecutive transitions at the first clutch bell 120 and at the second clutch bell 130. Due to the asymmetrical distribution of the signal-transmitting and non-signal-transmitting sections on the outer circumference of the first clutch bell 120 and on the outer circumference of the second clutch bell 130, the control unit can also determine an angular position of the shaft 110 in conjunction with a speed-dependent time duration between at least two transitions at the first signal transmitter 121 or at the second signal transmitter 131.

[0077] Fig. 2 shows an example and schematically a possible embodiment of a first clutch bell 120.

[0078] The first clutch bell 120 is made of steel, for example, and has an outer circumference 122. The outer circumference 122 consists of signal-transmitting sections 123 and non-signal-transmitting sections 124. The signal-transmitting sections 122 are material-based, ie, they consist of the steel of the clutch bell 120. The non-signal-transmitting sections 124, on the other hand, are designed as material recesses 124.

[0079] Likewise, in the embodiment of Fig. 2, it can also be the second clutch bell 130.

[0080] Fig. 3 shows exemplary and schematically measured time periods t over a continuous number of revolutions n of the shaft 110. The time periods t each describe a transition from a signal-transmitting section of the first clutch bell 120 to a non-signal-transmitting section of the first clutch bell 120 or vice versa to a subsequent transition at a constant speed of the shaft 110.

[0081] As can be seen, for example, every second time period 200 is comparatively short. These short time periods 200 are assigned to the non-signal-generating sections 124, which are all the same size and accordingly have an identical time period 200 at a constant speed until the following transition to a signal-generating section 123. The time periods 201, 202 and 203 assigned to the signal-generating sections 123, however, differ somewhat from one another because the signal-generating sections 123 are, for example, distributed asymmetrically over the outer circumference of the first clutch bell 120. From time period 203 onwards, the time periods 201, 202 and 203 are repeated because the outer circumference continues to rotate continuously. Thus, the angular position of the shaft 110 can be deduced from the last detected transition, for example transition 203.

[0082] In an analogous manner, the time durations of each transition from a signal-giving section to a non-signal-giving section are also measured at the second clutch bell 130.

[0083] Fig. 4 shows, by way of example and schematically, a deviation from a target value for a time offset Δt between an expected transition at the first clutch bell 120 and an actual transition of the first clutch bell 120 due to a torsion of the shaft 110.

[0084] The torsion of the shaft 110 is caused by a torque which is transmitted by the shaft 110 and results in the first clutch bell 120 being rotated relative to the second clutch bell 130 by a torsion-dependent angle.

[0085] Accordingly, a time offset occurs, which is a measure of the torsion of shaft 110. The time offset Δt becomes larger the greater the torsion.

[0086] Since the torsion is a consequence of the transmitted torque, the time offset Δt allows a determination of the torque accordingly.

[0087] In Fig. 4, eight different time offsets 301, 302, 303, 304, 305, 306, 307 and 308 are shown as examples, which represent an increasingly larger torque from left to right. Reference symbols

[0088] 100 device

[0089] 111 Wave

[0090] 120 first signal generator, first clutch bell

[0091] 121 first sensor, first Hall sensor

[0092] 122 outer circumference

[0093] 123 signaling section

[0094] 124 non-signaling section

[0095] 130 second signal generator, second clutch bell

[0096] 131 second sensor, second Hall sensor

[0097] 200 duration

[0098] 201 Duration

[0099] 202 Duration

[0100] 203 Duration t Duration

[0101] 301 Time offset

[0102] 302 Time offset

[0103] 303 Time offset

[0104] 304 Time offset

[0105] 305 Time offset

[0106] 306 Time offset

[0107] 307 Time offset

[0108] 308 Time offset

[0109] At time offset

Claims

Patent claims 1. Device (100) for determining a torque on a shaft (110), comprising the shaft (110) for transmitting the torque, a first signal transmitter (120) arranged on the shaft (110) in a rotationally fixed manner, a second signal transmitter (130) arranged on the shaft (110) at a distance from the first signal transmitter (120) and in a rotationally fixed manner, a first sensor (121) assigned to the first signal transmitter (120) for generating first measurement data, a second sensor (131) assigned to the second signal transmitter (130) for generating second measurement data, and a control unit, wherein the control unit is designed to determine a torsion of the shaft (110) based on the first and second measurement data, and wherein the control unit is further designed to determine the torque based on the torsion, characterized in that the first signal transmitter (120) is designed as a first clutch bell (120) and the second signal transmitter (130) is designed as a second clutch bell (130) are formed.

2. Device (100) according to claim 1, characterized in that the first sensor (121) senses an outer circumference (122) of the first signal generator (120), wherein the first signal generator (120) has signal-generating (123) and non-signal-generating sections (124) on its outer circumference (122), wherein the signal-generating (123) and the non-signal-generating (124) sections are distributed asymmetrically over the outer circumference (122) of the first signal generator (120) and / or that the second sensor (131) senses an outer circumference of the second signal generator (130), wherein the second signal generator (130) has signal-generating and non-signal-generating sections on its outer circumference, wherein the signal-generating and the non-signal-generating sections are distributed asymmetrically over the outer circumference of the second signal generator (130) are distributed.

3. Device (100) according to at least one of claims 1 or 2, characterized in that the signal-generating sections (123) are material-based and the non-signal-generating sections (124) are material recesses.

4. Device (100) according to at least one of claims 1 to 3, characterized in that the first clutch bell (120) is made of steel and is assigned to a first multi-disk clutch and the second clutch bell (130) is made of steel and is assigned to a second multi-disk clutch.

5. Device (100) according to at least one of claims 1 to 4, characterized in that the first sensor (121) is designed as a first Hall sensor (121) and the second sensor (131) is designed as a second Hall sensor (131).

6. Device (100) according to at least one of claims 1 to 5, characterized in that the first measurement data contain a transition of a signal-emitting section (123) to a non-signal-emitting section (124) or vice versa at the first signal transmitter (120) and that the second measurement data contain a transition of a signal-emitting section to a non-signal-emitting section or vice versa at the second signal transmitter.

7. Device (100) according to at least one of claims 1 to 6, characterized in that the control unit is designed to determine a rotational speed of the shaft (110) based on a time duration between at least two transitions at the first signal generator (120) and / or at the second signal generator (130).

8. Device (100) according to at least one of claims 1 to 7, characterized in that the control unit is designed to determine an angular position of the shaft (110) based on a time duration between at least two transitions at the first signal transmitter (120) and / or at the second signal transmitter.

9. Device (100) according to at least one of claims 7 or 8, characterized in that the control unit is designed to determine the rotational speed of the shaft (110) and / or the angular position of the shaft (110) based on a plurality of time periods.

10. Device (100) according to at least one of claims 1 to 9, characterized in that the control unit has a processor dedicated to the determination of the torque and / or the determination of the speed.

11. Power take-off transmission with a power take-off shaft, comprising a device (100) according to at least one of claims 1 to 7, wherein the device is designed to determine the torque on the power take-off shaft.

12. A work machine comprising a power take-off transmission according to claim 11.

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