Hysteresis clutch or brake and torque adjustment method

Abstract

Hysteresis coupling or brake consisting of a first hub assembly (1) equipped with at least one hysteresis ring (1.2) and a second hub assembly (2) which is rotatably mounted concentrically to the first hub assembly (1), fixed in the axial direction and equipped with magnetic blocks (2.6) or magnetic rings (2.4), wherein an annular air gap forms between the hysteresis rings (1.2) and the magnets (2.4, 2.6), wherein the axial fixing between the first and the second hub assembly (1, 2) defines a fixed axial overlap between hysteresis rings (1.2) and magnets (2.4, 2.6) and thus a fixed transmissible torque of the hysteresis coupling or brake, characterized by the fact that For the attachment of the hysteresis ring or rings (1.2) to the first hub assembly (1) and / or the magnets (2.4, 2.6) to the second hub assembly (2), at least in one direction an axial clearance large enough is provided that, when the hysteresis ring or rings (1.2) and / or the magnets (2.4, 2.6) are finally attached, their axial overlap can be varied in a range that reliably ensures compliance with a predefined slip torque.

Description

[0001] The present invention relates to a hysteresis clutch or brake and a torque adjustment method for a hysteresis clutch or brake having the features of the preambles of the independent claims.

[0002] Hysteresis couplings are known from the prior art, as disclosed, for example, in EP 1 026 815 B1.

[0003] In hysteresis couplings with the features of this patent, a rotary motion is transmitted without contact between a radially inner first hub part equipped with permanent magnets, across a cylindrical air gap, to a radially outer second hub part equipped with magnetizable hysteresis rings.

[0004] If the torque transmitted between the first and second hub parts is below the slip torque of the clutch, both hub parts rotate at the same speed.

[0005] If the slip torque is exceeded, a difference in rotational speed occurs between the two hub parts, and the resulting power loss is converted into heat.

[0006] Due to the coupling's design and the arrangement of the bearings between the two hub parts, the coupling operates with a fixed axial overlap between the permanent magnets and the hysteresis rings. Furthermore, the radial air gap across which the torque is transmitted also has a constant value, determined by the dimensions of the components used.

[0007] This results in the disadvantage for this hysteresis coupling according to the state of the art that the size of the transmissible torque depends directly on the dimensions of the components used and the magnetic properties of the magnetic materials used on both hub parts.

[0008] Both the component dimensions and the magnetic properties of the magnetic materials used are subject to manufacturing-related variations, which lead to correspondingly large variations in the slip torque of the clutch.

[0009] In state-of-the-art couplings, no design features are provided to compensate for these variations through adequate adjustment devices or other suitable measures.

[0010] In industrial practice, various manufacturing and design measures have therefore become established in connection with hysteresis clutches and brakes in order to compensate for the aforementioned variations in slip torques.

[0011] The first measure from the field of manufacturing technology mentioned here is the reworking of the dimensions of the components used, in particular the permanent magnets and / or the hysteresis rings.

[0012] For this purpose, the hysteresis clutch or brake is first at least partially installed and then the slip torque is measured.

[0013] If the limit of a predetermined torque value is exceeded, the surface of the components forming the cylindrical air gap of the coupling is machined in such a way that the cylindrical air gap increases and thereby reduces the transmissible torque of the hysteresis coupling or brake.

[0014] This can involve machining the radially inner component on its outer surface and / or the radially outer component on its inner surface. Machining can be carried out by turning, grinding, or a comparable material-removing manufacturing process.

[0015] A disadvantage of this method is the bare metallic surface left after processing the permanent magnets and / or hysteresis rings, which is very sensitive to environmental influences with the materials commonly used.

[0016] Furthermore, especially with machining processes involving chip formation, there is a high risk of overheating the machined components.

[0017] As a second measure from the field of manufacturing technology, the irreversible change of the magnetic properties by heating the components is practiced.

[0018] Here too, the hysteresis clutch or brake is first at least partially assembled, and then the slip torque is measured. If a predetermined torque value is exceeded, the entire clutch or parts thereof are heated in such a way that the permanent magnets and / or the hysteresis rings experience a permanent weakening of their magnetic properties to such an extent that the clutch slip torque subsequently reaches a predefined value.

[0019] The disadvantages of this method are the high cost of carrying it out and a high risk of irreversibly falling below the specified torque value after heat treatment.

[0020] A constructive measure to compensate for manufacturing and material-related variations in the slip torques of hysteresis clutches and brakes is known from DE 103 13 855 B4 of the applicant.

[0021] This discloses a hysteresis coupling or brake in which the permanent magnets and the hysteresis rings are arranged axially next to the rolling bearing of the coupling and in which the axial overlap between the permanent magnets and the hysteresis rings and thus the transmissible torque is adjustable by an adjusting and centering device arranged radially outside the rolling bearing.

[0022] The disadvantages of the aforementioned hysteresis coupling or brake according to this state of the art are the additional installation space required for the adjustment and centering device and the additional axial adjustment travel required for torque adjustment, as well as the high technical effort required for this.

[0023] Especially with hysteresis couplings that are manufactured in large quantities and operated with a constant torque, this described technical effort is undesirable.

[0024] From DE 37 32 766 A1, another permanent magnet excited hysteresis coupling or brake is known, in which a hysteresis element designed as a bell rotor interacts with an inner and an outer pole ring, each of which is equipped with permanent magnets.

[0025] The disadvantages of the presented hysteresis coupling or brake, which can also be adjusted by means of a thread, are its low power density and complex manufacturing.

[0026] Furthermore, a permanently magnetically excited coupling is known from the prior art, as disclosed in DE 80 28 527 U1.

[0027] To enable torque adjustment of the mounted coupling, rotatable sleeves with permanent magnets are provided on a pitch circle of a coupling component.

[0028] Disadvantages of the coupling presented here also include the low achievable power density and the complex construction.

[0029] DE 600 34 890 T2 shows a permanent magnet coupling with adjustable air gaps, consisting of a first shaft with a housing and a second shaft with a radially extending rotating rotor.

[0030] The disadvantages of the claimed design of this coupling are the complex construction and the high cost of the described method for adjusting the air gaps.

[0031] From US patent 2012 / 0194019A1, a device is ultimately known for transmitting linear or rotary motion by means of magnetic induction. Among other things, adjustment options are proposed to vary the technical properties of the device, which are invariably associated with considerable technical effort.

[0032] From the disadvantages of the hysteresis couplings or brakes described so far according to the prior art and from the disadvantages of the measures described from the field of manufacturing technology, the following task can be defined for the hysteresis coupling or brake according to the present invention: - Compact design of the clutch or brake. - Low technical effort required for production. - High precision of the set slip torque.

[0033] To solve this problem, a hysteresis clutch or brake is proposed according to the invention, which provides a maximum degree of accuracy with regard to the slip torque set on the clutch or brake, while having compact external dimensions and requiring little technical effort.

[0034] The plan is to mount the permanent magnets and hysteresis rings installed in the respective coupling in an adjustment device, to determine the transmissible torque at different axial overlaps of the permanent magnets and hysteresis rings, and to establish the required exact degree of overlap at which the desired torque of the hysteresis coupling or brake is transmitted.

[0035] The next step is to install the permanent magnets and hysteresis rings into the coupling with exactly the amount of overlap determined in the adjustment device.

[0036] For this purpose, a distance measurement determined in the adjustment device can be transferred directly or indirectly into a distance measurement in the hysteresis coupling or brake by suitable conversion and fixed.

[0037] One possible approach is to install the permanent magnets and / or the hysteresis rings directly into the adjustment device when determining the overlap required for a specific torque.

[0038] Alternatively, there is a second very advantageous option: to first firmly install the permanent magnets and / or the hysteresis rings in the corresponding hub parts and then, using the hub assemblies formed thereby, to determine the overlap corresponding to the required torque in the adjustment device.

[0039] The hysteresis coupling or brake according to the invention, as well as the adjustment method, can be implemented in a particularly advantageous manner if the permanent magnets with the required circumferentially alternating polarity are formed by a continuous magnetic ring.

[0040] It is equally advantageous if only the smallest possible number of hysteresis rings or only one hysteresis ring is used to achieve the desired torque.

[0041] Further features of the hysteresis coupling or brake according to the invention and the adjustment method will become apparent from the claims and from the descriptions of the following drawings.

[0042] They show: Fig. 1 Perspective view of a first embodiment of a hysteresis coupling according to the invention. Fig. 2 Longitudinal section through the hysteresis coupling made of Fig. 1. Fig. 3 Half cross-section through the hysteresis coupling made of Fig. 2. Detail D Enlarged section of a part of the hysteresis coupling Fig. 2. Fig. 4 Longitudinal section of a second embodiment of a hysteresis coupling. Fig. 5 Half cross-section through the second hysteresis coupling made of Fig. 4. Detail E Enlarged section of a part of the hysteresis coupling Fig. 4. Fig. 6 Longitudinal section through a first embodiment of an adjustment device with parts of the first hysteresis coupling. Detail F Enlarged section of a part of the adjustment device made of Fig. 6. Fig. 7 Longitudinal section of a third embodiment of a hysteresis coupling. Fig. 8 Cross-section through the third hysteresis coupling made of Fig. 7. Detail G Enlarged section of a part of the hysteresis coupling Fig. 7. Fig. 9 Longitudinal section through a second embodiment of an adjustment device with parts of the third hysteresis coupling. Detail H Enlarged section of a part of the adjustment device made of Fig. 9. Fig. 10 Longitudinal section of a fourth embodiment of a hysteresis coupling. Fig. 11 Cross-section through the fourth hysteresis coupling made of Fig. 10. Detail J Enlarged section of a part of the hysteresis coupling Fig. 10. Fig. 12 Longitudinal section through a third embodiment of an adjustment device with parts of the fourth hysteresis coupling. Detail K Enlarged section of a part of the adjustment device made of Fig. 12.

[0043] In Fig. 1 To illustrate a possible external shape, a perspective view of a first embodiment of the hysteresis coupling or brake according to the invention is shown first.

[0044] The hysteresis coupling or brake, hereinafter referred to only as hysteresis coupling (HC), consists of a first hub assembly (1) and a second hub assembly (2), which are rotatably mounted relative to each other about an axis of rotation (A).

[0045] The torque is transmitted from a flange thread (1.4) of a drive flange (1.3) via a hysteresis mechanism located inside the hysteresis coupling (HK) to a second hub part (2.1). The interior of the hysteresis coupling (HK) is protected from environmental influences by a sealing element (7).

[0046] Fig. Figure 2 shows a longitudinal section through the hysteresis coupling (HC) made of Fig. 1, consisting of a first and a second hub assembly (1, 2).

[0047] The first hub assembly (1) and the second hub assembly (2) are rotatably mounted relative to each other about the axis of rotation (A) via a coupling bearing (5) fixed to the bearing pin (3) by means of a bearing cap (6) and a bolt (4). The first hub assembly (1) consists of a bell-shaped first hub component (1.1) which, as an interface to further assemblies not shown here, has a radially outwardly directed drive flange (1.3) with flange threads (1.4) located on a pitch circle.

[0048] The bearing pin (3) and the first hub component (1.1) are advantageously designed as a single piece, wherein a non-magnetizable material such as austenitic steel or a light metal, preferably aluminium, is provided as a suitable material for this purpose.

[0049] A plurality of hysteresis rings (1.2), in this example 4 pieces, are arranged on an inner surface of the first hub part (1.1). The hysteresis rings (1.2) are made of a material that is easily magnetized or remagnetized (e.g. AlNiCo) and are bonded to the first hub part (1.1), for example by an adhesive bonding process.

[0050] The second hub assembly (2) consists of a second hub part (2.1) which is also bell-shaped and is arranged concentrically within the first hub assembly (1) and which has a drive bore (2.2) and a drive thread (2.3) at its axial end as an interface to other components not shown here.

[0051] A magnet carrier (2.5) with magnetic blocks (2.6) attached to it is fixed to the outer surface of the second hub part (2.1). The magnetic blocks (2.6) are attached to the magnet carrier (2.5) by an adhesive process, and the magnet carrier (2.5) is pressed onto the second hub part (2.1) via a second tolerance ring (2.10). The magnetic blocks (2.6) are made of a permanent magnet material, for example, a rare-earth material, and the magnetic field strength of the magnetic blocks is designed to be sufficient to fully magnetize the hysteresis rings (1.2).

[0052] The torque transmission of the hysteresis coupling (HK) takes place without contact between the radially oriented north and south poles of the magnetic blocks (2.6) which alternate in the circumferential direction and the hysteresis rings (1.2) inside the first hub part (1.1).

[0053] The magnetic blocks (2.6) and the hysteresis rings (1.2) are protected against environmental influences by a sealing element (7) which is firmly connected to the first hub part (1.1) and forms a concentric sealing gap with the second hub part (2.1).

[0054] The torque transmission of the hysteresis coupling (HC) is based on the interaction of the radially directed north and south poles of the magnetic blocks (2.6) arranged alternately in the circumferential direction and the opposing hysteresis rings (1.2).

[0055] If no relative movement occurs between the first hub assembly (1) and the second hub assembly (2), the magnetic blocks (2.6) in the hysteresis rings (1.2) generate opposite and oppositely magnetized poles. A torque can be generated between the first hub assembly (1) and the second hub assembly (2) using these radially acting magnetic forces.

[0056] When the first hub assembly (1) with the hysteresis rings (1.2) is rotated relative to the second hub assembly (2) equipped with magnetic blocks (2.6), the hysteresis rings (1.2) are remagnetized during this rotation (i.e., a north pole becomes a south pole and vice versa). During this process, the so-called hysteresis loop in the BH diagram of the hysteresis rings (1.2) is traversed, and the enclosed area in the BH diagram corresponds to the energy required for the remagnetization. This energy is proportional to the torque transmitted by the hysteresis coupling (HC) in slip operation and in slip-free operation.

[0057] The magnitude of the torque transmitted by the hysteresis coupling (HC) depends, in addition to the aforementioned magnetic and geometric properties of the components used, on the axial overlap of the magnetic blocks (2.6) and hysteresis rings (1.2), which is determined by the coupling dimension (DK) shown in detail D. In this example, the coupling dimension (DK) is conveniently measured between the second hub end (2.9), which lies in the same plane as the first stop surface (1.5) of the first hub part (1.1), and the axial end of the magnetic blocks (2.6). The determination of the coupling dimension (DK) required for a specific transmissible torque of the hysteresis coupling (HC) is described elsewhere. Fig. 6 explained in more detail.

[0058] Furthermore, detail D shows the total axial length of the hysteresis rings (L1) and the length (L2) of the magnetic blocks (2.6). (L1) and (L2) are equal in this example.

[0059] In Fig. 3 is a section AA through the hysteresis coupling (HK) according to the invention. Fig. 2 shown. From this, the mounting of the magnet carrier (2.5) with individual magnetic blocks (2.6) and the ring-shaped form of the hysteresis rings (1.2) can be seen.

[0060] Fig. Figure 4 shows a further embodiment of a hysteresis coupling (HC) according to the invention, which is basically based on the construction of the coupling made of Fig. 2 corresponds to the hysteresis coupling (HC) in Fig. 4 points towards Fig. 2. The magnet carrier (2.5) is attached to the second hub part (2.1) via a hub thread (2.7). The magnet carrier (2.5), which has an internal thread, is screwed onto the hub thread (2.7) in a defined axial position and bonded in the thread, which corresponds to the desired axial overlap between the magnet blocks (2.6) and the hysteresis rings (1.2) to achieve the required transmissible torque of the hysteresis coupling (HC).

[0061] Detail E again shows the coupling dimension (DK), which is assigned to the axial overlap between the magnet blocks (2.6) with length (L2) and the hysteresis rings (1.2) with length (L1).

[0062] From the BB cut in Fig. Figure 5 shows again the arrangement of the individual magnetic blocks (2.6) on the magnetic carrier (2.5) and the ring-shaped design of the hysteresis rings (1.2).

[0063] A first embodiment of an adjustment device (JV) for carrying out the adjustment method according to the invention is shown in Fig. 6 shown.

[0064] The adjusting device (JV) consists of a first device assembly (8) and a second device assembly (9), which are rotatably mounted relative to each other about an axis of rotation (A).

[0065] In the present example, the first device assembly (8) consists of a first device hub (8.1) which is fixedly arranged via a torque measuring device (MV).

[0066] In a suitable first centering (8.3) of the first device hub (8.1) the first hub part (1.1) of the hysteresis coupling (HK) with the glued-in hysteresis rings (1.2) is received, attached to the drive flange (1.3) on a first flat surface (8.2) and fixed with a retaining screw (8.4).

[0067] The second fixture assembly (9) consists of a second fixture hub (9.1) with a second planar surface (9.2) and a second centering (9.3), on which a magnet carrier (2.5) with glued-on magnetic blocks (2.6) is frictionally fastened via a clamping cover (9.4) and clamping screws (9.5).

[0068] Furthermore, the second device assembly (9) is rotatably mounted about the axis of rotation (A) relative to the first device assembly (8) and axially displaceable parallel to the axis of rotation (A).

[0069] The axial length (L1) of the entire hysteresis ring assembly (1.2) and the axial length (L2) of the magnetic blocks are also shown in Detail F. In the example shown, lengths (L1) and (L2) are equal, which offers advantages when determining the device dimension (DV) and transferring it to a coupling dimension (DK) in Detail D and Detail E. However, it is also conceivable that lengths (L1) and (L2) could be different.

[0070] For the adjustment process with the adjustment device (JV) according to Fig. The following procedure is proposed in section 6: - The first hub part (1.1) with hysteresis rings (1.2) and the magnet carrier (2.5) with bonded magnetic blocks (2.6) are inserted into the first fixture hub (8.1) and the second fixture hub (9.1) up to the first and second flat surfaces (8.2, 9.2) and secured with the retaining screw (8.4) and the clamping screws (9.5). The retaining screw (8.4) and the clamping screws (9.5) are dimensioned such that they transmit the maximum torque of the hysteresis coupling (HC) with sufficient reliability via frictional engagement. - The first fixture assembly (8) and the second fixture assembly (9) are brought into an axial position relative to each other, in which the hysteresis rings and magnetic blocks of equal length in the axial direction completely overlap and in which the fixture dimension (DV) is therefore equal to “zero”. - The second fixture assembly (9) is rotated about the axis of rotation (A) at a speed approximately corresponding to the later operating speed of the hysteresis coupling (HK), and simultaneously the measurement of the transmitted torque is started via the torque measuring device (MV). The determined torque at the fixture dimension (DV) "zero" must be at least equal to or greater than the torque to be transmitted later in the hysteresis coupling. - During continuous rotation and measurement of the transmitted torque, the second fixture assembly (9) is moved away from the first fixture assembly (8) in the displacement direction (V) parallel to the axis of rotation (A) until the desired torque value is displayed during measurement. The fixture dimension (DV) is then determined at this torque value. - In the case of hysteresis couplings (HC), accordingly Fig. 2 to Fig. 5. The device dimension (DV) can be used directly as the coupling dimension (DK).

[0071] After that, the assembly of the in Fig. 2 to Fig. The hysteresis coupling (HC) shown in section 5 is advantageously proposed as follows: - The first hub assembly (1) and the magnet carrier (2.5) with the glued-on magnetic blocks (2.6) are removed from the adjustment device (JV). - Since the first stop surface (1.5) of the first hub part (1.1) and the second hub end (2.9) lie in one plane, the magnet carrier (2.5) is positioned according to Fig. 2 with the magnetic blocks (2.6) up to the coupling dimension (DK) onto the second hub part (2.1) over the second tolerance ring (2.10) or the magnetic carrier (2.5) is pressed according to Fig. 4 screwed and glued onto the hub thread (2.7) of the second hub part (2.1) until the coupling dimension (DK) is reached. - Subsequently, the first and second hub assemblies (1, 2) can be connected via the coupling bearing (5) and protected from external influences with the sealing element (7).

[0072] In Fig. Figure 7 shows a longitudinal section of a third embodiment of the hysteresis coupling (HK) according to the invention, which serves as a basis for explaining a further adjustment method.

[0073] The hysteresis coupling (HK) consists of a first and a second hub assembly (1, 2), wherein the two hub assemblies (1, 2) are rotatably mounted relative to each other about the axis of rotation (A) via a coupling bearing (5) fixed on the bearing bolt (3) by means of a bearing cap (6) and a bolt screw (4).

[0074] The first hub assembly (1) consists as in Fig. 2 and Fig. 4 from a bell-shaped first hub component (1.1) which, as an interface to further components not shown here, has a radially outwardly directed drive flange (1.3) with flange threads (1.4) located on a pitch circle.

[0075] In this embodiment, the bearing bolt (3) is made of a high-strength material, preferably a steel alloy, for the transmission of high radial forces and is connected to the first hub component (1.1), preferably made of a light metal, by suitable connecting means, preferably screws.

[0076] A one-piece hysteresis ring (1.2) is arranged on an inner surface of the first hub part (1.1). In this example, the hysteresis ring is frictionally connected to the first hub part (1.1) by a first tolerance ring (1.6) and is in contact with the first stop surface (1.5). The second hub assembly (2) consists of a bell-shaped second hub part (2.1), which is arranged concentrically within the first hub assembly (1). At its axial end, this second hub assembly (2.1) has a drive bore (2.2) and a drive thread (2.3) to serve as an interface to other components not shown in detail here.

[0077] A one-piece magnetic ring (2.4) is glued to the outer surface of the second hub part (2.1), the axial position of the magnetic ring (2.4) on the second hub part (2.1) being defined by a sealing element (7) screwed and glued onto the hub thread (2.7).

[0078] In this example, the torque transmission of the hysteresis coupling (HC) also occurs without contact between the radially oriented north and south poles of the magnetic ring (2.4), which alternate circumferentially, and the one-piece hysteresis ring (1.2) inside the first hub part (1.1). The magnetic ring (2.4) and the hysteresis ring (1.2) are protected from environmental influences by the sealing and stop element (7), which is firmly connected to the hub thread (2.7) of the second hub part (2.1) and forms a concentric sealing gap with the first hub part (1.1).

[0079] In this example, the magnitude of the torque transmitted by the hysteresis coupling (HK) also depends, in addition to the geometric and magnetic properties of the components used, on the axial overlap of the magnet ring (2.4) and the hysteresis ring (1.2), which results from the coupling dimension (DK) shown in detail G. In this example, the coupling dimension (DK) is also conveniently measured between the second hub end (2.9), which lies in the same plane as the first stop surface (1.5) of the first hub part (1.1), and the axial end of the magnet blocks (2.6).

[0080] The determination of the coupling dimension (DK) required for a specific transmissible torque of the hysteresis coupling (HK) is described elsewhere based on the Fig. 9 explained in more detail.

[0081] Furthermore, detail G shows the axial length of the hysteresis ring (L1) and the length (L2) of the magnetic ring (2.4), which here have different dimensions, but can also have the same length.

[0082] In Fig. 8 is a section CC through the hysteresis coupling (HK) according to the invention. Fig. Figure 7 shows the continuous ring shape of the magnet ring (2.4) and the hysteresis ring (1.2).

[0083] Fig. Figure 9 shows a second embodiment of an adjustment device (JV) for carrying out the adjustment method according to the invention.

[0084] The adjusting device (JV) is as described in Fig. 6 is constructed from a first fixture assembly (8) and a second fixture assembly (9), which are arranged concentrically to each other and are rotatably mounted to each other about an axis of rotation (A).

[0085] The first device assembly (8) consists of a first device hub (8.1) which is fixedly arranged via a torque measuring device (MV).

[0086] In a first centering (8.3) of the first device hub (8.1), the one-piece hysteresis ring (1.2) is directly received, attached to a first flat surface (8.2), and fixed with a retaining screw (8.4). It is also conceivable to use a group of hysteresis rings (1.2) instead of the one-piece hysteresis ring (1.2), as shown in Fig. 2 and Fig. 4 to be directly received in the first centering (8.3) of the first device hub (8.1) and fixed by means of several retaining screws (8.4).

[0087] It should be noted that the geometric sequence of the hysteresis rings (1.2) in the adjustment device (JV) and in the hysteresis coupling (HK) must be the same.

[0088] The second fixture assembly (9) consists of a second fixture hub (9.1) with a second flat surface (9.2) and a second centering element (9.3), on which the one-piece magnetic ring (2.4) is frictionally fastened via a clamping cover (9.4) and clamping screws (9.5). Furthermore, the second fixture assembly (9) is rotatably mounted relative to the first fixture assembly (8) about the axis of rotation (A) and is axially displaceable in the displacement direction (V) parallel to the axis of rotation (A).

[0089] The axial length (L1) of the hysteresis ring (1.2) and the axial length (L2) of the magnetic ring (2.4) are also visible in the illustration in Detail H. The lengths (L1) and (L2) are different in the example shown, which necessitates a conversion to the coupling dimension (DK) when transferring the device dimension (DV).

[0090] The following procedure is used for the adjustment process with the adjustment device (JV) according to Fig. 9 suggested: - The hysteresis ring (1.2) and the magnetic ring (2.4) are inserted into the first device hub (8.1) and into the second device hub (9.1) up to the first and second flat surfaces (8.2, 9.2) and fastened with the retaining screw (8.4) and the clamping screws (9.5). The first fixture assembly (8) and the second fixture assembly (9) are brought into an axial position relative to each other, in which the hysteresis rings (1.2) and magnetic rings (2.4), which have different lengths in the axial direction, completely overlap. Ideally, the first flat surface (8.2) and the flat surface of the magnetic ring (2.4) facing the torque measuring device (MV) lie in the same plane. Thus, the fixture dimension (DV) in the initial position of the adjustment process corresponds to the difference between the length of the hysteresis ring (1.2) and the length of the magnetic ring (2.4). - The second device assembly (9) is set into rotation about the axis of rotation (A) at a speed that corresponds approximately to the later operating speed of the hysteresis coupling (HK) and the measurement of the transmitted torque is started simultaneously via the torque measuring device (MV).

[0091] The determined torque at the device dimension (DV) “zero” must be at least equal to or greater than the torque to be transmitted later in the hysteresis coupling (HK). - During continuous rotation and measurement of the transmitted torque, the second fixture assembly (9) is moved away from the first fixture assembly (8) in the displacement direction (V) parallel to the axis of rotation (A) until the desired torque value is displayed during measurement. The fixture dimension (DV) is then determined at this torque value. - In the case of hysteresis couplings (HC), accordingly Fig. 7. The device dimension (DV) must be converted into the corresponding coupling dimension (DK) according to the equation: DK=DV+L1−L2

[0092] For torque accuracy, it is advantageous to directly transfer the position of the hysteresis ring (1.2) and the magnetic ring (2.4) from the adjustment device (JV) to the hysteresis coupling (HK).

[0093] For the installation of a hysteresis coupling (HC) according to Fig. 7. The following advantageous procedure is proposed: - The hysteresis ring (1.2) and the magnetic ring (2.4) are removed from the adjustment device (JV). Since the first stop surface (1.5) of the first hub part (1.1) and the second hub end (2.9) lie in the same plane, the sealing and stop element (7) is screwed onto the hub thread (2.7) and bonded at a distance from the second hub end (2.9) that corresponds to the length of the magnet ring (L2) plus the coupling dimension (DK). The magnet ring (2.4) is then pushed onto the second hub part (2.1) up to the stop and sealing element (7) and bonded in place. - Finally, the first and second hub assemblies (1, 2) can be connected via the coupling bearing (5).

[0094] Fig. Figure 10 shows the longitudinal section of a fourth embodiment of the hysteresis coupling (HK) according to the invention. The hysteresis coupling (HK) again consists of a first and a second hub assembly (1, 2), wherein the two hub assemblies (1, 2) are rotatably mounted relative to each other about the axis of rotation (A) via a coupling bearing (5) fixed to the bearing pin (3) by means of a bearing cap (6) and a bolt screw (4).

[0095] The first hub assembly (1) consists as in Fig. 7 from a bell-shaped first hub component (1.1) with suitable interfaces in the form of a drive flange (1.3) with flange threads (1.4). In this embodiment as well, the bearing pin (3) for the transmission of high radial forces is made of a high-strength material, preferably a steel alloy, and is connected to the first hub component (1.1) by suitable fasteners.

[0096] A one-piece hysteresis ring (1.2) is arranged on an inner surface of the first hub part (1.1), which in the present example is frictionally connected to the first hub part (1.1) by a first tolerance ring (1.6) and has a distance to the first stop surface (1.5) designated as coupling dimension (DK), the size of which will be determined later based on Fig. The adjustment process is defined in section 12.

[0097] The second hub assembly (2) in turn consists of a bell-shaped second hub part (2.1), which is arranged concentrically within the first hub assembly (1) and which has a drive bore (2.2) and a drive thread (2.3) as an interface to further components not shown in detail.

[0098] A one-piece magnetic ring (2.4) is glued to the outer surface of the second hub part (2.1), the axial position of the magnetic ring (2.4) on the second hub part (2.1) being defined by a second hub collar (2.11) with which the magnetic ring (2.4) is in contact.

[0099] It is particularly advantageous if the length of the magnet ring (L2) is dimensioned such that the end of the magnet ring (2.4) facing away from the second hub collar (2.11) lies in the same plane as the second hub end (2.9) and the first stop surface (1.5) of the first hub part (1.1).

[0100] In this example, the torque transmission of the hysteresis coupling (HK) also takes place without contact between the radially oriented north and south poles of the magnet ring (2.4) which alternate in the circumferential direction and the one-piece hysteresis ring (1.2) inside the first hub part (1.1).

[0101] The magnetic ring (2.4) and the hysteresis ring (1.2) are protected from environmental influences by the sealing element (7) which is firmly connected to the hub thread (2.7) of the second hub part (2.1) and forms a concentric sealing gap with the first hub part (1.1).

[0102] In this example, the magnitude of the torque transmitted by the hysteresis coupling (HK) depends not only on the geometric and magnetic properties of the components used, but also on the axial overlap of the magnetic ring (2.4) and the hysteresis ring (1.2), which is determined by the coupling dimension (DK) shown in detail J. In this example, the coupling dimension (DK) is conveniently measured between the first stop surface (1.5) of the first hub part (1.1), which lies in the same plane as the second hub end (2.9), and the axial end of the hysteresis ring (1.2). The determination of the coupling dimension (DK) required for a specific transmissible torque of the hysteresis coupling (HK) is described elsewhere. Fig. 12 explained in more detail.

[0103] Furthermore, detail J shows the axial length (L1) of the hysteresis ring and the length (L2) of the magnetic ring (2.4), which have different dimensions. It is also conceivable that the lengths (L1, L2) of the magnetic ring (2.4) and the hysteresis ring (1.2) are the same.

[0104] Fig. Figure 12 shows a third embodiment of an adjustment device (JV) for carrying out the adjustment method according to the invention.

[0105] The adjusting device (JV) is as described in Fig. 6 and Fig. 9 is constructed from a first fixture assembly (8) and a second fixture assembly (9), which are arranged concentrically to each other and are rotatably mounted to each other about an axis of rotation (A).

[0106] The first device assembly (8) consists of a first device hub (8.1) which is fixedly arranged via a torque measuring device (MV).

[0107] In a first centering (8.3) of the first device hub (8.1), the one-piece hysteresis ring (1.2) is directly received, attached to a first flat surface (8.2), and fixed with a retaining screw (8.4). It is also conceivable to use a group of hysteresis rings (1.2) instead of the one-piece hysteresis ring (1.2), as shown in Fig. 2 and Fig. 4 to be directly received in the first centering (8.3) of the first device hub (8.1) and fixed by means of several retaining screws (8.4).

[0108] It should be noted that the geometric sequence of the hysteresis rings (1.2) in the adjustment device (JV) and in the hysteresis coupling (HK) must be the same.

[0109] The second fixture assembly (9) consists of a second fixture hub (9.1) with a second flat surface (9.2) and a second centering element (9.3), on which the one-piece magnetic ring (2.4) is frictionally fastened via a clamping cover (9.4) and clamping screws (9.5). Furthermore, the second fixture assembly (9) is rotatably mounted relative to the first fixture assembly (8) about the axis of rotation (A) and is axially displaceable in the displacement direction (V) parallel to the axis of rotation (A).

[0110] The axial length (L1) of the hysteresis ring (1.2) and the axial length (L2) of the magnet ring (2.4) are also visible in the illustration in Detail K. The lengths (L1) and (L2) are different in the example shown, which necessitates a conversion to the coupling dimension (DK) when transferring the device dimension (DV).

[0111] The following procedure is used for the adjustment process with the adjustment device (JV) according to Fig. 12 suggested: - The hysteresis ring (1.2) and the magnetic ring (2.4) are inserted into the first device hub (8.1) and into the second device hub (9.1) up to the first and second flat surfaces (8.2, 9.2) and fastened with the retaining screw (8.4) and the clamping screws (9.5). The first fixture assembly (8) and the second fixture assembly (9) are brought into an axial position relative to each other, in which the hysteresis rings (1.2) and magnetic rings (2.4), which have different lengths in the axial direction, completely overlap. Ideally, the second planar surface (9.2) of the second fixture hub (9.1) and the third planar surface (8.5) of the hysteresis ring (1.2) lie in one plane. The fixture dimension (DV) is therefore equal to "zero" in this state. - The second device assembly (9) is set into rotation about the axis of rotation (A) at a speed that corresponds approximately to the later operating speed of the hysteresis coupling (HK) and the measurement of the transmitted torque is started simultaneously via the torque measuring device (MV).

[0112] The determined torque at the device dimension (DV) “zero” must be at least equal to or greater than the torque to be transmitted later in the hysteresis coupling (HK). - During continuous rotation and measurement of the transmitted torque, the second fixture assembly (9) is moved in the displacement direction (V) parallel to the axis of rotation (A) towards the first fixture assembly (8) until the desired torque value is displayed during the measurement.

[0113] The device dimension (DV) is determined at this torque value. - In the case of the hysteresis coupling (HC) accordingly Fig. 10. The device dimension (DV) must be converted into the corresponding coupling dimension (DK) according to the equation: DK=DV+L2−L1

[0114] Here too, for torque accuracy, it is important to directly transfer the position of the hysteresis ring (1.2) and the magnetic ring (2.4) from the adjustment device (JV) to the hysteresis coupling (HK).

[0115] For the installation of a hysteresis coupling (HC) according to Fig. 10. The following advantageous procedure is proposed: - Hysteresis ring (1.2) and magnetic ring (2.4) are removed from the adjustment device (JV). - The magnetic ring (2.4) is pushed onto the second hub part (2.1) until it contacts the second hub collar (2.11) and is preferably fixed by an adhesive bond.

[0116] With a favorable geometric design of the components, the end of the magnet ring (2.4) then lies in a plane with the second hub end (2.9). - The hysteresis ring (1.2) is then pressed into the first hub part (1.1) over the first tolerance ring (1.6) up to the coupling dimension (DK), until a distance equal to the coupling dimension (DK) is reached between the hysteresis ring (1.2) and the first stop surface (1.5). For this purpose, it is advantageous to insert a stop element with an axial length corresponding to the coupling dimension (DK) between the hysteresis ring (1.2) and the first stop surface (1.5) of the first hub part (1.1). Finally, the first and second hub assemblies (1, 2) can be connected via the coupling bearing (5), and the sealing element (7) is screwed and bonded onto the second hub part (2.1). Alternatively, the sealing element can be pressed onto a cylindrical projection of the second hub part (2.1). Reference symbol list 1 First hub assembly 1.1 First hub part 1.2 Hysteresis 1.3 Drive flange 1.4 Flange thread 1.5 First stop surface 1.6 First tolerance ring 2 Second hub assembly 2.1 Second hub part 2.2 Drive bore 2.3 Drive thread 2.4 Magnetic ring 2.5 Magnetic carriers 2.6 Magnetic cube 2.7 Hub thread 2.8 Stop ring 2.9 Second Hub End 2.10 Second tolerance ring 2.11 Second Hub Bund 3 bearing bolts 4 bolt screws 5 clutch bearings 6 bearing caps 7 Sealing element 8 First fixture assembly 8.1 First device hub 8.2 First planning area 8.3 First Centering 8.4 Retaining screw 8.5 Third Planning Area 9 Second fixture assembly 9.1 Second device hub 9.2 Second Plan Area 9.3 Second Centering 9.4 Tension cover 9.5 Tensioning screw A axis of rotation HK Hysteresis Coupling JV Adjustment Device MV torque measuring device DV device dimension DK coupling dimension L1 Total length of the hysteresis rings (1.2) L2 Length of the magnetic ring (2.4) or the magnetic cuboid (2.6) V Direction of movement

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