SENSOR APPARATUS HAVING AN ADJUSTMENT DEVICE

Abstract

A sensor apparatus for a towing vehicle coupling, by means of which a trailer vehicle can be coupled to a towing vehicle, wherein the towing vehicle coupling has a coupling element for the releasable coupling of a mating coupling element, which elements are or can be fastened to the towing vehicle and the trailer vehicle and, in the mutually coupled state, forming a coupling joint, can be rotated about a coupling joint rotational axis relative to one another, wherein the sensor apparatus has a driver which is mounted on a driver mounting device so as to be rotatable about a drive rotational axis relative to the coupling element and which can be rotationally driven about the drive rotational axis by the mating coupling element upon rotation about the coupling joint rotational axis in order to record a rotation of the mating coupling element about the coupling joint rotational axis relative to the coupling element, and wherein the sensor apparatus has a sensor for recording a particular rotational position of the driver.

Claims

1. A sensor apparatus for a towing vehicle coupling or as a component of a towing vehicle coupling, by means of which a trailer vehicle, can be coupled to a towing vehicle wherein the towing vehicle coupling has a coupling element for the releasable coupling of a mating coupling element, which elements are or can be fastened to the towing vehicle and to the trailer vehicle and, in the mutually coupled state, forming a coupling joint, can be rotated about a coupling joint rotational axis relative to one another, wherein the sensor apparatus has a driver which is mounted on a driver mounting device so as to be rotatable about a drive rotational axis relative to the coupling element and which can be rotationally driven about the drive rotational axis by the mating coupling element upon rotation about the at least one coupling joint rotational axis in order to detect a rotation of the mating coupling element about the at least one coupling joint rotational axis relative to the coupling element, and wherein the sensor apparatus has a sensor for detecting a particular rotational position of the driver relative to the driver mounting device with respect to the drive rotational axis, and wherein the sensor apparatus has a retaining device for retaining the driver mounting device with respect to the coupling element so as to be non-rotatable with respect to the drive rotational axis, and wherein the sensor apparatus further comprises an adjustment device with at least one adjustment element for moving and/or guiding the driver between a working position set closer to the mating coupling element and provided for rotationally driving the driver and an idle position farther away from the mating coupling element, and wherein the adjustment device is not in engagement with the retaining device in the working position, so that the retaining device can be moved relative to the coupling element with at least one degree of freedom of movement which is different from the rotatability about the drive rotational axis and is suitable for providing or maintaining the drive coupling of the driver with the mating coupling element.

2. The sensor apparatus according to claim 1, wherein the retaining device mounts the driver mounting device, with respect to the coupling element with the at least one degree of freedom of movement which is suitable for providing and maintaining the drive coupling of the driver with the mating coupling element.

3. The sensor apparatus according to claim 1, wherein the driver is loaded into the working position by a spring assembly which acts on the retaining device.

4. (canceled)

5. The sensor apparatus according to claim 1, further comprising a magnet assembly with at least one magnet for providing a magnetic force of attraction acting on the driver towards the mating coupling element.

6. The sensor apparatus according to claim 1, wherein the adjustment device has or forms an actuator for moving the driver between the working position and the idle position.

7. The sensor apparatus according to claim 1, wherein the adjustment device has or forms a guide, which guides the driver along a predetermined adjustment path when moving between the working position and the idle position.

8. The sensor apparatus according to claim 1, further comprising at least one adjustment body, which is joined to the driver or the retaining device and with which an adjustment contour of the at least one adjustment element of the adjustment device is in guiding engagement and/or drive engagement for moving the driver between the working position and the idle position.

9. The sensor apparatus according to claim 1, further comprising at least two adjustment bodies, each of which is in engagement with an adjustment contour of an adjustment element of the adjustment device when moving between the idle position and the working position and which have an angular distance from one another.

10. The sensor apparatus according to claim 1, further comprising two or three adjustment bodies, each of which is in engagement with an adjustment contour of the at least one adjustment element of the adjustment device in such a way that the driver is supported non-pivotably at the at least one adjustment element with respect to an adjustment path or an adjustment axis along which the driver is movable and/or guidable by means of the adjustment device between the working position and the idle position.

11. (canceled)

12. The sensor apparatus according to claim 1, wherein the at least one adjustment element is mounted at an adjustment element bearing, which is stationary with respect to the coupling element or provided for stationary location with respect to the coupling element, so as to be rotatable about an axis which is coaxial with or parallel to the drive rotational axis or inclined relative to the drive rotational axis at an angle of maximally 10, and/or extends around said axis in an annular manner.

13-16. (canceled)

17. The sensor apparatus according to claim 1, wherein the at least one adjustment element is movable, if the driver is in the working position, between a release position in which the at least one adjustment body is out of engagement with the adjustment contour, engaging with the or a movement recess adjacent to the adjustment contour, and an engagement position in which the at least one adjustment body is in engagement with the adjustment contour.

18. The sensor apparatus according to claim 1, wherein the at least one adjustment element has an idle position holding receptacle, in which the adjustment body is held in a stationary manner at the adjustment element in a position assigned to the idle position of the driver, and/or an idle position stop, which the adjustment body hits in a position assigned to the idle position of the driver.

19. The sensor apparatus according to claim 1, wherein the adjustment device has two adjustment elements with an adjustment contour each, which are movable relative to each other, with which adjustment elements the at least one adjustment body is in guide engagement and/or drive engagement for moving between the working position and the idle position.

20. The sensor apparatus according to claim 19, wherein the adjustment contours are designed for adjustment and/or guidance of the at least one adjustment body along an adjustment path by adjusting the adjustment elements transversely to the adjustment path, wherein inclinations of the adjustment contours are designed such that the at least one adjustment body supported at the adjustment contours is immovable transversely to the adjustment path.

21. The sensor apparatus according to claim 19 wherein the at least one adjustment body engages between the adjustment contours and/or wherein the adjustment contours have mutually opposite adjustment sections.

22. The sensor apparatus according to claim 19, wherein the adjustment contours, at the relative adjustment of the adjustment elements, form a holding receptacle for holding the at least one adjustment body, with which the adjustment body engages and which is movable between a position assigned to the working position and a position assigned to the idle position by the relative adjustment of the adjustment elements.

23. The sensor apparatus according to claim 19, wherein the adjustment elements have idle position stops, between which the at least one adjustment body is held stationary in a position assigned to the idle position of the driver.

24. The sensor apparatus according to claim 1, further comprising an electric drive motor for driving the at least one adjustment element.

25. The sensor apparatus according to claim 1, further comprising a control device for activating the adjustment device.

26. The sensor apparatus according to claim 1, wherein at least one adjustment element of the adjustment device has a through-opening for a drive element, with which another adjustment element of the adjustment device can be driven.

27. The sensor apparatus according to claim 26, wherein a drive contour for the drive element is located at the through-opening, so that the drive element can drive the adjustment element having the through-opening and the other adjustment element located adjacent to the through-opening.

28. The sensor apparatus according to claim 19, wherein the adjustment elements are motion-coupled by means of an actuating gear mechanism for their relative adjustment.

29. The sensor apparatus according to claim 28, wherein the actuating gear mechanism has a gear wheel which is in actuating engagement on opposite sides with an actuating contour of the one adjustment element, and with an actuating contour of the other adjustment element, so that the one adjustment element is or can be driven in the opposite direction relative to the other adjustment element at a rotation of the gear wheel.

30. The sensor apparatus according to claim 28, wherein the actuating gear mechanism comprises a deflecting linkage, which has at least two actuating arms, each of which is pivotable in its one end region with one of the adjustment elements about a pivot axis and in its other end region joined to an actuating arm of the linkage, wherein at least one of the actuating arms is joined about a pivot axis to the drive arm of the linkage, so that the adjustment elements can be adjusted relative to one another by a pushing actuation or pulling actuation of the drive arm.

31. The sensor apparatus according to claim 1, wherein the adjustment contour of the adjustment element forms a part of the deflection gear mechanism, so that the adjustment contour moves or guides the at least one adjustment body, at a rotational actuation of the at least one adjustment element about a rotational axis, parallel to the rotational axis between the working position and the idle position in a linear fashion or with a linear component parallel to the rotational axis.

32. The sensor apparatus according to claim 1, wherein the at least one adjustment element has an annular or sleeve-shaped form.

33. The sensor apparatus according to claim 1, wherein the adjustment device has two tubular or sleeve-shaped adjustment elements, which extend in an annular fashion coaxially around a central axis and engage with each other, or of which one adjustment element accommodates the other adjustment element.

34. The sensor apparatus according to claim 33, wherein at least one of the adjustment elements or both adjustment elements is or are rotatable about common central axis of the adjustment elements and/or a common rotational axis with respect to the coupling element.

35. The sensor apparatus according to claim 1, wherein the at least one adjustment element of the adjustment device forms a part of a housing which accommodates the retaining device at least partially, and/or wherein the adjustment device forms a housing for a support of the retaining device which carries the driver mounting device.

36. (canceled)

37. The sensor apparatus according to claim 1, wherein the at least one adjustment element consists of metal and/or plastic.

38. The sensor apparatus according to claim 1, wherein the driver is mounted with respect to the coupling element with at least one degree of freedom of movement different from the rotatability about the drive rotational axis by means of a mounting device, which is or can be arranged to be stationary with respect to the towing vehicle coupling in order to provide or maintain a drive coupling with the mating coupling element, wherein the mounting device has bearing parts, which are mounted slidably relative to one another by means of a sliding bearing with respect to a longitudinal axis, wherein the bearing parts are loaded towards a position away from one another by a spring assembly and/or have swivel bearing assemblies in the regions averted from the sliding bearings, each of which gimballed bearings provides a pivotability of the bearing part connected to the respective swivel bearing assembly with two pivot axes extending at an angle to each other, which pivot axes extend transversely, to the drive rotational axis.

39. (canceled)

40. The sensor apparatus according to claim 1, further comprising a protective housing, which accommodates the adjustment device at least partially and is elastic and/or telescoping and/or longitudinally movable with respect to at least one degree of freedom of movement along which the driver is movable between the idle position and the working position.

41-42. (canceled)

Description

[0163] Embodiments of the invention are explained below with reference to the drawing, of which:

[0164] FIG. 1 shows an exploded perspective view of a sensor apparatus with an adjustment device,

[0165] FIG. 2 shows the sensor apparatus according to FIG. 1 in a side view with its driver in idle position,

[0166] FIG. 3 shows the sensor apparatus according to FIG. 2 on a first movement section towards the working position of the driver,

[0167] FIG. 4 shows the sensor apparatus according to FIGS. 2, 3, the driver having moved farther towards the working position,

[0168] FIG. 5 shows the sensor apparatus according to FIGS. 2 to 4, the driver having moved into the working position,

[0169] FIG. 6 shows a perspective oblique view of the sensor apparatus according to FIG. 2,

[0170] FIG. 7 shows the sensor apparatus according to FIG. 6, approximately in the position corresponding to FIG. 4,

[0171] FIG. 8 shows the sensor apparatus according to FIGS. 6, 7 in the position corresponding to FIG. 5,

[0172] FIG. 9 shows a variant of the sensor apparatus according to the preceding figures with a manual actuation at an angle from above,

[0173] FIG. 10 shows the sensor apparatus from FIG. 9 in a side view,

[0174] FIG. 11 shows the sensor apparatus according to FIGS. 9, 10 from above with its driver in working position,

[0175] FIG. 12 shows the sensor apparatus according to FIG. 11, but with the driver moved into the idle position,

[0176] FIG. 13 shows a perspective oblique view of a retaining device of the sensor apparatus according to the preceding figures,

[0177] FIG. 14 shows a sensor apparatus with an alternative retaining device,

[0178] FIG. 15 shows the sensor apparatus according to FIG. 14 in an exploded view and with an adjustment device,

[0179] FIG. 16 shows a further sensor apparatus with an adjustment device in idle position,

[0180] FIG. 17 shows the sensor apparatus according to FIG. 16, but in working position,

[0181] FIG. 18 shows a perspective oblique view of a towing vehicle coupling at an angle from above with a sensor apparatus according to the preceding figures at an angle from above, wherein a trailer coupling is coupled to the towing vehicle coupling,

[0182] FIG. 19 shows a sectional view through the towing vehicle coupling and the trailer coupling as well as a driver of the sensor apparatus according to the preceding figures.

[0183] In the exemplary embodiments explained below, components are partially similar or identical in their functionality. In this respect reference numbers are used which differ by 100 or are partially identical.

[0184] A towing vehicle coupling 60 is designed as a semitrailer coupling 60A. The semitrailer coupling 60A has a coupling element 61 in the form of a so-called mounting plate 61A. At the mounting plate 61A and thus at the coupling element 61, an insertion receptacle 62 is provided, which could also be described as insertion opening. The insertion receptacle 62 facilitates the insertion of a mating coupling element 81 of a trailer coupling 80 having a so-called pin 82 or king pin 82. The pin 82 is used to couple the trailer coupling 80 to the towing vehicle coupling 60.

[0185] The towing vehicle coupling 60 is or can be located at a towing vehicle Z. The towing vehicle Z is a so-called articulated lorry, for example or another heavy goods vehicle.

[0186] The trailer coupling 80, on the other hand, is or can be mounted at a trailer vehicle A, for example a so-called semitrailer.

[0187] In order to couple the trailer coupling 80 to the towing vehicle coupling 60, the king pin or pin 82 is led to the coupling element 61, for example from a rear side of the towing vehicle Z or from a front side of the coupling element 61, the towing vehicle Z in practice reversing in order to couple the semitrailer and thus the trailer vehicle A.

[0188] The trailer vehicle A is supported on a top side 83 of the trailer coupling 80 or of the pin 82.

[0189] The top side 83 is joined to an underside of the trailer vehicle A, for example welded or bolted.

[0190] The top side 83 is provided at a flange body 84, the undersideaverted from the top side 83of which forms a support surface 85 for support at the towing vehicle coupling 60. The support surface 85 is used for location on a locating surface 65 on the top side 64 of the mounting plate 61A or the coupling element 61. The locating surface 65 and the support surface 85 are preferably plane surfaces. The trailer coupling 80 is therefore supported across a large area on the locating surface 65 in a horizontal plane, so that essential supporting forces do not act on the king pin 82 itself, which engages with a coupling receptacle 70 of the towing vehicle coupling 60 with a pin section 91.

[0191] A lead-on chamfer 66, along which the support surface 85 can slide when the trailer coupling 80 is coupled to the towing vehicle coupling 60, is located on the front side 63. The insertion of the king pin 82 into the coupling receptacle 70 is facilitated by lead-in chamfers 68, which bound the insertion receptacle 62 laterally and extend towards the coupling receptacle 70 in a tapering fashion. The lead-in chamfers 68 extend from the front side 63 towards a front side 69 of the coupling element 61 or the mounting plate 61A.

[0192] The coupling receptacle 70 has a substantially cylindrical inner contour 71, wherein said inner contour 71 does not have to be completely cylindrical, but only forms an enveloping inner contour in a manner of speaking. In this way the pin section 91 with its likewise substantially cylindrical outer circumferential contour 86 is therefore at least partially supported at the inner circumference of the coupling receptacle 70, so that the king pin 82 can rotate essentially about a coupling joint rotational axis GZ relative to the towing vehicle coupling 60.

[0193] A support body 72 is located on an underside 74 of the coupling element 61 or the mounting plate 61A. The support body 72 is provided adjacent to and/or below the coupling receptacle 70. The support body 72 can be plate-like. The king pin 82 has to be inserted into the coupling receptacle 70 past the support body 72 when the trailer coupling 80 is coupled to the towing vehicle coupling 60.

[0194] The trailer coupling 80 can be locked at the towing vehicle coupling 60 by a locking device 75. The locking device 75 comprises a locking body 76, which engages with a locking receptacle 87 of the pin 82, which is provided at the outer circumference 86 thereof.

[0195] The pin 82 can easily be inserted into the coupling receptacle 70, since a lead-on chamfer 89 is for example provided on its front side 88, i.e. the side of the pin 82 which is opposite the flange body 84. The lead-on chamfer 89 is provided by a rounded or conical edge section between the outer circumference 86 and the front side 88 or end face of the pin 82.

[0196] The locking body 76 can expediently be driven by a manual or motorised locking drive 77, so that it engages with the locking receptacle 87 in its locking position and is moved out of the locking receptacle 87 in its release position, so that the pin 82 can be moved out of the coupling receptacle 70.

[0197] The trailer coupling 80 can rotate with respect to the towing vehicle coupling 60 about the coupling joint rotational axis GZ, i.e. a rotational axis which is usually vertical when travelling, but also about coupling joint rotational axes GX and GY, i.e. about a longitudinal axis and a transverse axis extending in particular in the vehicle longitudinal direction of the towing vehicle Z as well as orthogonally at right angles to the vehicle longitudinal direction of the towing vehicle Z.

[0198] If the trailer coupling 80 is coupled to the towing vehicle coupling 60, the mating coupling element 81 can rotate or pivot relative to the coupling element 61 with respect to the coupling joint rotational axes GX, GY and GZ, so that the coupling element 61 and the mating coupling element 81 form a coupling joint 91. The mating coupling element 81 and the coupling element 61 are in bearing engagement with each other in a bearing region 96. The bearing region 96 is preferably approximately cylindrical.

[0199] When negotiating a curve, for example, the trailer vehicle A can swivel relative to the towing vehicle Z substantially about the coupling joint rotational axis GZ. At a rolling movement, however, the trailer vehicle A can swivel relative to the towing vehicle Z about the coupling joint rotational axis GX, and/or at a pitching movement about the coupling joint rotational axis GY.

[0200] In these cases it is possible to detect a pivoting or rotation of the trailer vehicle A relative to the towing vehicle Z about the coupling joint rotational axis GZ, namely by means of a sensor apparatus 10.

[0201] The sensor apparatus 10 is accommodated in a receiving space 67 below the coupling receptacle 70. The receiving space 67 is a receiving space which is in any case provided in a semitrailer coupling 60A, i.e. there is no need for a structural modification.

[0202] The sensor apparatus 10 is provided for rotational entrainment by the mating coupling element 81, which has a drive surface 90 for this purpose. The drive surface 90 is represented by the front side 88, for example, or provided thereon. However, the slide-on chamfer 89 or another region of the outer circumferential contour 86 can wholly or partially form the drive surface 90 as well, which will become clearer.

[0203] The sensor apparatus 10 has a driver 20, which can be entrained by the mating coupling element 81, i.e. the pin or king pin 82, and rotated about a drive rotational axis MD.

[0204] The driver 20 has a drive surface 21 for establishing a drive contact or a drive connection to the pin 82. The drive surface 21 is provided on a free front side of the driver 20. From the drive surface 21 there extends a circumferential wall 22, which is substantially conical or cylindrical, for example.

[0205] The drive surface 21 is provided at a front wall 21A substantially designed as a plane or level wall. The circumferential wall 22 extends from the front wall 21A.

[0206] The sensor apparatus 10 comprises a sensor 11, for example a magnetic sensor. Signals generated by the sensor 11 are evaluated by an evaluation device 12, which comprises a processor 13 and a memory 14, for example. The processor 13 executes programme code of at least one programme 16, which processes the sensor signals of the sensor 11 and makes them available to an interface 15, in particular a bus coupler, for an on-board power supply N of the towing vehicle Z, for example. The interface 15 is a CAN bus interface, for example, but can easily be or comprise another digital or analogue interface.

[0207] The driver 20 is mounted at a driver mounting device 25 so as to be rotatable about the drive rotational axis MD. The driver mounting device 25 comprises a cylindrical housing 26, for example, in which a rotational axis body 27 is rotatably mounted at one or more pivot bearings 28. The rotational axis body 27 is non-rotatably joined to the driver 20. The driver 20 can therefore rotate about the drive rotational axis MD relative to the driver mounting device 25.

[0208] One or more sensor transducers 24, e.g. magnets used for exciting the sensors 11, is/are non-rotatably joined to the rotational axis body 27.

[0209] At this point it should be mentioned, however, that the magnetic measuring principles or sensor principles of the sensor apparatus 10 are not the only embodiment. In a sensor apparatus according to the invention, inductive, capacitive or optical sensorsalso in combinationcan be provided, for example. Instead of the sensor transducers 24 designed as magnets, optical markings, in particular lines or the like, can be provided, for example, which markings are detectable by an optical sensor 11. Capacitive detection is readily possible as well, for example if suitable electric fields are provided by the sensor transducers.

[0210] Instead of the sensor transducer 24, other sensor elements or sensors can also be provided. The sensorial detection of the position of a driver relative to a support or bearing body, in particular the driver mounting device 25, can therefore also be realised by at least one sensor which is located at the driver and thus rotates about the drive rotational axis relative to the support or the driver mounting device.

[0211] The driver 20 can wholly or partially consist of an elastic material, for example a flexible plastic, rubber or the like. Particularly advantageous is an elastic resilience in the region of the drive surface 21.

[0212] The end wall 21A is preferably designed as a frictional surface or has a frictional surface. Corundum, quartz, rock particles or a similar hard material with sharp edges and in any case points or the like are provided at the frictional surface, for example.

[0213] The driver 20 preferably has a magnet 23 or another magnet arrangement for providing a magnetic force of attraction loading the driver 20 towards the mating coupling element 81. It is possible that the driver 20 as a whole is represented by the magnet 23 or that the magnet 23 is embedded into a base body of the driver 20.

[0214] The driver 20 can be deflected from its central position by degrees of freedom of rotation DX and DY and/or by degrees of freedom of linear movement LX, LY and LZ.

[0215] The degrees of freedom of rotation DX and DY and the degrees of freedom of linear movement LX, LY and LZ are degrees of freedom of movement BF which differ from the rotatability about the drive rotational axis MD and are used to maintain a drive coupling of the driver 20 to the mating coupling element 81.

[0216] The degrees of freedom of pivoting or degrees of freedom of rotation DX, DY extend orthogonally to the drive rotational axis MD and in each case orthogonally to each other. With the degree of freedom of rotation DX, for example, the driver 20 can pivot about an axis SX which is parallel to the coupling joint rotational axis GX. If deflected or displaced with the degree of freedom of linear movement LX, the driver 20 can be deflected in a linear fashion about the axis SX parallel to the coupling joint rotational axis GX, i.e. moved at right angles to the drive rotational axis MD.

[0217] The further degree of freedom of linear movement LY allows a deflection or displacement of the driver 20 transversely to the degree of freedom of linear movement LX or to the X-axis and/or along an axis SY which is parallel to the coupling joint rotational axis GY. At a rotation by the degree of freedom of rotation DY, the driver 20 rotates about said axis SY parallel to the coupling joint rotational axis GY.

[0218] The displaceability with the degree of freedom of movement LZ is provided to be parallel to or coaxial with the drive rotational axis MD.

[0219] All of the above-mentioned degrees of freedom of rotation DX, DY or degrees of freedom of linear movement LX, LY or LZ allow the driver 20 to be deflected from its central position, for example when the trailer coupling 80 is coupled to the towing vehicle coupling 60, so that its end wall 21A comes to lie in a plane parallel fashion at the front side 88 or the support surface or the drive surface of the pin 82. In addition the rotational drive coupling of the driver 20 is made possible even at a deflection transverse to the drive rotational axis MD. The driver 20 thus pivots with the degree of freedom of rotation DX and/or DY, for example, but still remains in drive contact with the pin 82.

[0220] The mobility of the driver 20 by the degrees of freedom of movement DX, DY, LX, LY and LZ is provided by the retaining device 40, which is permanently located at the driver mounting device 25, thus being immobile.

[0221] The retaining device 40 holds the driver mounting device 25 non-rotatably with respect to the drive rotational axis MD while allowing movements of the driver mounting device 25 and thus of the driver 20 by the degrees of freedom of movement DX, DY and the degrees of freedom of translational or linear movement LX, LY and LZ.

[0222] The retaining device 40 comprises a mounting device 40A.

[0223] The mounting device 40A comprises a swivel bearing 41, which comprises a bearing base 42 which is stationary with respect to the towing vehicle coupling 60. A shaft body 43 which pivotably mounts a swivel body 44 passes through the bearing blocks, for example. The shaft body 43 is for example mounted pivotably at the swivel body 44 and/or the bearing base 42.

[0224] A further swivel bearing 45 is provided at the swivel body 44. The pivot axes R1Y and R2Y of the swivel bearings 41, 45 extend parallel to each other. The longitudinal axes of the shaft bodies 43, 46 are therefore parallel to each other.

[0225] The swivel bearing 45 is used for the pivotable mounting of two articulated rods 47, which project from the swivel body 44 towards the driver mounting device 25 and hold the driver mounting device 25.

[0226] Each of the articulated rods 47 carries a shaft body 48, which holds a support 50 of the retaining device 40, on which the driver mounting device 25 is located, so as to be pivotable about a pivot axis corresponding to the degree of freedom of rotation DY. The driver mounting device 25 can therefore pivot about the pivot axis DY, but is held non-rotatably relative to the drive rotational axis MD by the support 50. The shaft bodies 48 are represented by or connected to adjustment bodies 51, for example.

[0227] It is possible that each of the shaft bodies 48 is joined to the support 50 so as to be pivotable about a pivot axis, e.g. the pivot axis DY, i.e. each shaft body 48 can pivot at the support 50 about a pivot axis DY.

[0228] If the shaft bodies 48 are in alignment witch each other, both pivot about the same pivot axis DY. If the shaft bodies 48 are angled relative to each other, each of the shaft bodies 48 can pivot about its own rotational axis or pivot axis, which axes are then angled to each other.

[0229] It is also possible, however, that the shaft bodies 48 are pivotable about the pivot axis DY by means of ball joints 47C, 47D to be described below, in which case both is possible, i.e. that the shaft bodies 48 are joined to the support 50 so as to be non-rotatable or rotatable with respect to the pivot axis DY. The rotatability or the degree of freedom of rotation with respect to the pivot axis DY is also possible by means of the ball joints 47C, 47D if the shaft bodies 48 or adjustment bodies 51 enclose an angle with each other, i.e. are not in alignment but have a mutual angular distance of e.g. 160-180.

[0230] In FIG. 13 it can be seen that one of the adjustment bodies 51 is not connected to the mounting device 40. It is possible that this adjustment body 51 is not provided, i.e. that only those adjustment bodies 51 which form shaft bodies 48 are provided.

[0231] To provide the degrees of freedom of movement LX, LY and LZ, the articulated rods 47 are joined to the shaft bodies 46 and 48 by ball joints, i.e. by means of ball joints 47A, 47B, 47C and 47D. The ball joints 47A-47B allow further degrees of freedom of rotation and degrees of freedom of pivoting R2X, R3X, R4X, R5X as well as R2Z, R3Z, R4Z and R5Z.

[0232] At this point it should be mentioned, however, that a gimballed mounting would be possible instead of the ball joints 47A-47B.

[0233] The articulated rods 47 and the shaft bodies 46, 68 define with their swivel joints, i.e. the ball joints 47A-47B in their connecting regions, a four-bar linkage 47V and/or an articulated parallelogram.

[0234] It should furthermore be mentioned that, for the degrees of freedom of pivoting or the degrees of freedom of rotation DY and R2Y, the swivel bearing 45 and a swivel bearing 49 comprising the shaft body 48 are sufficient. It is also possible that the swivel bearings 45, 49 provide a displaceability and thus a degree of freedom of translational movement. If the shaft bodies 46, 48 are for example displaceable with respect to the component at which they are rotatably located, i.e. with respect to the swivel body 44 and the support 50, degrees of freedom of translational movement LY can easily be realised.

[0235] The swivel bearings 41, 45, 49 form a swivel bearing assembly which allows a translational movement or a degree of freedom of translational movement of the driver 20, i.e. the degree of freedom of movement LX. The driver 20 pivotably mounted by means of swivel bearings 41, 45, 49 to realise a degree of freedom of translational movement. The pivot axes of the swivel bearings 41, 45, 49 are parallel to one another.

[0236] The degree of freedom of translational movement LY is also exclusively realised by swivel bearings, i.e. the ball joints 47A-47B.

[0237] In a working position AS the driver 20 is in drive contact with the mating coupling element 81. In an idle position R, on the other hand, the driver 20 is removed from the mating coupling element 81, so that the mating coupling element 81 cannot entrain the driver 20. The idle position R is in particular provided for coupling the trailer coupling 80 to the towing vehicle coupling 60, while the working position AS of the driver 20 is set when the mating coupling element 81 is in engagement with the coupling element 61, i.e. coupled thereto.

[0238] To move the driver 20 between the working position AS and the idle position R, an adjustment device 50 with an actuating drive 55 is provided.

[0239] The actuating drive 55 comprises a drive train with an electric drive motor 55A, which drives an output 55C via a gear mechanism 55B. The drive motor 55A can be driven in mutually opposite directions to oscillate to and fro. The output 55C is designed in the manner of an output shaft, for example, and has a drive pinion 55D.

[0240] It is advantageous that the actuating drive 55 can move the driver 20 between the working position AS and the idle position R even when the mating coupling element 81 is in engagement with the coupling element 61.

[0241] To control the actuating drive 55, a control device 56 is provided,

[0242] The control device 56 is a microprocessor controller, for example, but a control having analogue, e.g. logical, gates, would readily be possible as well. A processor 56A and a memory 56B of the control device are internally connected to each other, wherein at least one control programme 56C stored in the memory 56B can be executed by the processor 56A, so that it carries out the functions explained below.

[0243] For communication with e.g. the actuating drive 55, in particular the actuating or drive motor 55A, and with a sensor 57, an input/output interface 56D of the control device 56 is provided.

[0244] The sensor 57 for example detects a position of the mating coupling element 81 relative to the coupling element 61 in order to ascertain in this way that the mating coupling element 81 is in engagement with the coupling element 61, i.e. in a coupling position.

[0245] It is also possible, however, that the sensor 57 detects a position of the locking body 76, e.g. its closed position. In this case the control device 56 can move the driver 20 and the driver mounting device 25 from the idle position R into the working position AS, if the locking body 76 is moved from its idle position R into its locking position. If the locking body 76 is moved from its locking position towards an idle position R provided for uncoupling the trailer vehicle A, however, the control device 56 activates the drive motor 55A for movement from the working position AS into the idle position R.

[0246] It would also easily be possible that the locking drive 77 is coupled to the control device 56, for example, signalling via a signalling line not shown in the drawing whether the locking drive 77 is activated to move from the locking position into the idle position R or vice versa. The locking drive 77 can also be represented by a manual actuating element, in particular an operating lever, the position of which can be detected by the control device 56 by means of a sensor 57B.

[0247] The control device 56 furthermore advantageously has a current sensor 57A for the detection of a drive current for the drive motor 55A. If the driver 20 is moved into the idle position R or the working position AR, the drive motor 55A can no longer rotate, as a result of which the drive current increases, which can be detected by the current sensor 57A. The control device 56 then switches the drive current off.

[0248] The control device 56 can furthermore be activated by a switch 57C, e.g. a pushbutton, for activating the drive motor 55A for activation towards the working position AS and/or towards the idle position R.

[0249] The driver mounting device 25 is located at the support 50. The support 50 comprises a support plate 52, on the top side of which the driver mounting device 25 is located. The support 50 is loaded towards the working position AS by a spring assembly 53 with a compression spring 53A.

[0250] The support 50 and thus the retaining device 40 and the components located thereon, i.e. the driver mounting device 25 and the driver 20, are movable between the idle position R and the working position AS by means of an adjustment device 30.

[0251] The adjustment device 30 forms a guide 30F, which guides the support 50 along an adjustment path VS between the working position AS and the idle position R. In this it is advantageously provided that the guide 30F is a forced guide, i.e. that the support 50 is guided by the adjustment device 30 along the adjustment path VS from the idle position R until it reaches the working position AS. In the present case the adjustment path VS is a linear adjustment axis or a substantially linear axis, any deviations of the adjustment path from a linear adjustment axis being caused by motoric play.

[0252] The adjustment path VS preferably extends parallel to the drive rotational axis MD or at an angle of maximally 100 inclined thereto.

[0253] The adjustment device 30 comprises adjustment elements 31, 32, which have adjustment contours 33, 34, at which adjustment bodies 51 connected or motion-coupled to the support 50 and thus to the retaining device 40 are guided. The adjustment contours 33, 34 are inclined with respect to the adjustment path VS and in the present embodiment act as adjustment contours for resetting the driver 20 from the working position AS into the idle position R. The spring assembly 53, i.e. a component of the retaining device 40, specifically acts towards the working position AS.

[0254] The adjustment elements 31, 32 are designed as sleeve bodies or tubular bodies. The adjustment element 32 is accommodated in an interior of the adjustment element 31.

[0255] The adjustment elements 31, 32 are mounted so as to be rotatable about a rotational axis DA. In this it is possible that only one of the adjustment elements 31, 32 is mounted for rotation about the rotational axis DA with respect to the towing vehicle coupling 60, in particular the coupling element 61, for example. Both adjustment elements 31, 32 are preferably mounted for rotation about the rotational axis DA, however.

[0256] The adjustment element 31 is for example mounted directly at an adjustment element bearing 35 for rotation about the rotational axis DA. The adjustment element 31 forms a pivot bearing or a bearing receptacle for the other adjustment element 32 located in its interior. The adjustment element 32 is for example not mounted rotatably at the adjustment element bearing 35 or not in engagement with the adjustment element bearing 35. It is also possible, however, that both adjustment elements 31, 32 are mounted rotatably at the adjustment element bearing 35, or that the adjustment element 32 located radially inwards with respect to the rotational axis DA is mounted at the adjustment element bearing 35 for rotation about the rotational axis DA and the radially outer adjustment element 31 is rotatably mounted not at the adjustment element bearing 35, but at the inner adjustment element 32.

[0257] The adjustment elements 31, 32 have circumferential walls 31A, 32A extending in an annular fashion around the rotational axis DA.

[0258] In the circumferential walls 31A, 32A through-openings 33D, 34D, at which the adjustment contours 33, 34 are located, are provided.

[0259] Each adjustment contour 33, 34 has an idle position holding receptacle 37 in its end region assigned to the idle position R. In a relative position of the adjustment elements 31, 32 which is assigned to the idle position R, the idle position holding receptacles 37 are opposite each other and form a reception chamber in which a respective adjustment body 51 guided at the respective adjustment contour 33, 34 is held non-rotatably with respect to the rotational axis DA. At each idle position holding receptacle 37, in particular its base or end region, an idle position stop 37A is provided, for example. This position is shown in FIGS. 2 and 6.

[0260] The adjustment elements 31, 32 are coupled to each other by an actuating gear mechanism 95. A gear wheel 96 meshes with actuating contours 97, 98 of the adjustment elements 31, 32, for example.

[0261] The actuating contours 97, 98 are for example provided at through-openings 39 extending in an annular fashion around the rotational axis DA. The actuating contours 97, 98 extend in the circumferential direction around the rotational axis DA on the respective longitudinal narrow sides of the through-openings 39 in the respective circumferential walls 31A, 32A of the adjustment elements 31, 32. The actuating contours 97, 98 comprise or are designed as toothings, for example.

[0262] At this point it should be mentioned that the actuating contours 97, 98 can also be designed as plane contours, for example, which can be driven by the gear wheel 96 if the latter is designed as a friction wheel, for example.

[0263] The actuating contours 97, 98 are located opposite each other.

[0264] The gear wheel 96 is in engagement with one each of the actuating contours 97, 98 on mutually opposite sides.

[0265] In the end regions of the actuating contours 97, 98 end stops 99 are preferably provided, which the gear wheel 96 can hit.

[0266] It is advantageous if the drive motor 55A switches off on reaching a respective end stop 99, for example if a working current provided for the operation of the drive motor 55A exceeds a predetermined threshold.

[0267] Alternatively or in addition it is also possible, however, that the drive motor 55A switches off before and/or at reaching the end stop 99. At least one sensor can be provided for this, for example, e.g. a position sensor detecting a respective position of the adjustment element 31 and/or the adjustment element 32 and/or a sensor detecting the rotations of the drive 55C.

[0268] As a result of this configuration a rotation of the gear wheel 96 causes mutually opposed and/or counter-rotating movements of the adjustment elements 31, 32, wherein, for example when the driver 20 is moved from the idle position R into the working position AS, the adjustment element 31 rotates in one rotational direction DG, e.g. anticlockwise, and the other adjustment element 32 rotates in an opposite rotational direction DU, e.g. clockwise, about the rotational axis DA. When the driver 20 is moved from the working position AS towards the idle position R, the adjustment element 31 rotates in the rotational direction DU and the adjustment element 32 rotates inversely in the rotational direction DG

[0269] The gear wheel 96 could for example be provided at a bearing 96L arranged to be stationary with respect to the towing vehicle coupling 60. The adjustment elements 31, 32 rotate past said bearing 96L. The bearing 96L is indicated in FIG. 1 in the form of the drive motor 55A, which can for example rotate freely if one of the adjustment elements 31, 32 is actuated manually and the drive motor 55A is not energised.

[0270] The gear wheel 96 can also be represented by the drive pinion 55D of the drive motor 55A or the gear mechanism 55B. The drive pinion 55D meshes with the actuating contours 97, 98.

[0271] The support 50 is loaded towards the working position AS by the spring assembly 53. If the adjustment elements 31, 32 are actuated to move the driver 20 towards the working position AS by the drive motor 55A or another working force acting on one of the adjustment elements 31, 32 or on the gear wheel 96, the adjustment contours 33, 34 are actuated to move away from each other, wherein each adjustment body 51 is held between mutually opposite adjustment contours 33 and 34. Together these form a holding receptacle 33, for example a V-shaped holding receptacle, in which the adjustment body 51 is held non-rotatably with respect to the adjustment path VS.

[0272] From the support 50, there project several adjustment bodies 51, e.g. adjustment bodies 51A, 51B, 51C, which have an angular distance, in particular identical angular distances, with respect to the rotational axis DA and/or the adjustment path VS. The adjustment bodies 51 are arranged at angular distances of 60, for example. In the same way and accordingly at the same angular distances as the adjustment bodies 51, three pairings of adjustment contours 33, 34, i.e. adjustment contours 33A, 34A 33B, 34B and 33C, 34C, are provided at the adjustment elements 31, 32, with which adjustment contours the adjustment bodies 51A, 51B, 51C are in engagement. As a result the support 50 is guided between the working position AS and the idle position R so as to be non-tiltable and/or non-pivotable with respect to the adjustment path VS and/or the rotational axis DA.

[0273] It is self-evident that only one of the adjustment bodies 51A, 51B, 51C or two of the adjustment bodies 51A, 51B, 51C or further adjustment bodies 51, e.g. four or five adjustment bodies, can also be provided, for example. At least one or several or all of the adjustment bodies is or are preferably in engagement with a pairing of adjustment contours 33, 34.

[0274] As long as the adjustment bodies 51A, 51B, 51C are in engagement with their respectively assigned adjustment contours 33A, 34A 33B, 34B and 33C, 34C, they have an engagement position E. As shown in FIGS. 4 and 7, this engagement position E is maintained until the adjustment elements 31, 32 have a relative position assigned to the working position AS of the driver 20.

[0275] The adjustment elements 31, 32 then continue to rotate into a release position F (FIGS. 5 and 8), in which the adjustment bodies 51A, 51B, 51C enter movement recesses 36 adjacent to the adjustment contours 33A, 34A 33B, 34B and 33C, 34C. A movement recess 36 is provided adjacent to each of the adjustment contours 33A, 34A 33B, 34B and 33C, 34C, wherein the movement recesses lie opposite one another in pairs in the release position F in such a way that a kind of window or movement opening is formed in which the respective adjustment bodies are movable with respect to the coupling element 61 with the degrees of freedom of movement BF provided by the retaining device 40, which differ from the rotatability about the drive rotational axis MD. The driver 20 is accordingly mounted with the degrees of freedom of movement BF as well.

[0276] At this point it should be noted that these degrees of freedom of movement can be restricted insofar as the adjustment body 51 can hit the edge region of the movement recess 36 if the driver 20 is correspondingly far deflected with respect to the adjustment device 30 with a degree of freedom of movement which is different from the drive rotational axis MD. In practice, however, i.e. at a trailer operation of the towing vehicle coupling 60 and/or contact of the mating coupling element 81 with the driver 20 during a travelling operation of the towing vehicle Z, such excessive deflections do not occur.

[0277] The adjustment bodies 51A, 51B can be parts of the mounting device 41A, for example shaft elements or shaft bodies, e.g. one of the shaft bodies 48. The adjustment body 51C, on the other hand, does not form a part of the mounting device 41A.

[0278] In FIGS. 9-12 an alternative manual actuating concept is shown in an adjustment device 30A of a sensor apparatus 10A. The sensor apparatus 10A is substantially identical with the sensor apparatus 10, a manual actuation being provided.

[0279] The adjustment device 30A has adjustment elements 31A, 32A, which are basically identical with the elements 31, 32. The adjustment element 31A is stationary with respect to the towing vehicle coupling 60, however, while the adjust adjustment element 32A can pivot with respect to the adjustment element 31A about a rotational axis DA. For this purpose the adjustment element 32A is mounted pivotably or rotatably in or at the adjustment element 31A, wherein the adjustment element bearing 35 described above can easily provide a swivel bearing or pivot bearing for the adjustment element 32A, which is indicated in FIG. 9.

[0280] An actuating gear mechanism 195 is provided for actuating the adjustment device 30A. The actuating gear mechanism 195 comprises a deflecting linkage 196, for example.

[0281] An actuating contour 197 is connected to the adjustment element 31A, while an actuating contour 198 is connected to the adjustment element 32A. The actuating contours 197, 198 are used for actuating the actuating gear mechanism 195 and are for example represented by projections which project radially in front of the adjustment elements 31A, 32A. The actuating contour 198 for example projects through a through-opening 139 of the adjustment element 31A in a radially outward direction in front of the adjustment element 31A.

[0282] At the actuating contours or actuating projections 197, 198, actuating arms 160, 161 are pivotably mounted by means of swivel bearings 162, 163. The actuating arms 160, 161 can be driven by a drive arm 164. The actuating arms 160, 161 are pivotably joined to the drive arm 164 by means of swivel bearings 165, 166. The swivel bearings 165, 166 are provided in a longitudinal end region of the drive arm 164, while the other longitudinal end region or main section of the drive arm 164 advantageously provides a handle 167.

[0283] By pulling the drive arm 164, for example from a position assigned to the working position AS away from the adjustment device 30A or the adjustment bodies 31A, 32A, the adjustment device 30A can be moved from the position assigned to the working position AS into a position assigned to the idle position R. In this process the drive arm 164 is as it were supported on the actuating contour 197, which forms an abutment for the deflecting linkage 196. As a result the drive arm 164 can apply a tensile force to the actuating contour 198 and thus to the adjustment element 32A via the actuating arm 161, whereby the adjustment element 32A is rotated or pivoted about the rotational axis DA relative to the adjustment element 31A. The adjustment contours 33, 34 then act to move the driver 20 from the working position AS towards the idle position R.

[0284] The sensor apparatus 10A for example has the retaining device 40, which is only shown in the form of the adjustment bodies 51 in the drawing, however, whereas the mounting device 40A is not shown.

[0285] A retaining device 140 of a sensor apparatus 10B as shown in FIG. 14 and FIG. 15 could easily be provided in the sensor apparatus 10 and/or 10A as well, however.

[0286] The retaining device 140 is particularly suitable for integration into an adjustment device, e.g. an adjustment device 30B, which is substantially identical with the adjustment device 30 but has longer or more elongated adjustment elements 31B, 32B with respect to the rotational axis DA, which are otherwise identical with the adjustment elements 31, 32, for example having the actuating contours 97, 98 for the actuating gear mechanism 95, with which the gear wheel 96 is in engagement. In addition, the adjustment contours 33, 34 for the adjustment bodies 51, which are located at the support 52, are provided.

[0287] In the sensor apparatus 10B the support 52 is mounted movably with respect to degrees of freedom of movement BF, which are different from the rotatability about the drive rotational axis MD and provided and suitable for providing the drive-coupling of the driver 20 with respect to the mating coupling element 81.

[0288] The mounting device 140A has bearing parts 141, 142, which are displaceable relative to each other with respect to a sliding axis TL by means of a sliding bearing 143. The sliding axis TL is preferably parallel to the drive rotational axis MD or inclined thereto by a small angle. A bearing projection 144 of the one bearing part 142 engages with a bearing receptacle 156 of the other bearing part 141, for example, and is there accommodated so as to be displaceable with respect to the sliding axis TL.

[0289] The bearing parts 141, 142 are loaded away from each other by a spring assembly 153. The spring assembly 153 for example comprises a compression spring 153A supported at the bearing parts 141, 142. The compression spring 153A is accommodated in the bearing receptacle 145, for example, and acts on that section of the bearing projection 144 which engages with the bearing receptacle 145.

[0290] The bearing parts 141, 142 have gimballed bearings or gimbal bearings 146, 147 in the end regions averted from the sliding bearing 143. One of the gimballed bearings 146 is or can be located in a stationary position with respect to the towing vehicle coupling 60, while the other gimballed bearing 147 is supported at the support 50. The gimbal bearings 146, 147 form swivel bearing assemblies 146A, 147A, the pivot axes of which extend at an angle, in particular at right angles, to each other. Instead of a respective gimbal bearing 146, 147, swivel bearings arranged next to each other or in a row could also be provided.

[0291] The gimbal bearings 146, 147 have bearing bodies 148, 149, for example spherical bearing bodies. At their outer circumference the bearing bodies 148, 149 have bearing receptacles 148B, 148D or 149B and 149D, with which the bearing elements 148A, 148C, 149A, 149C engage. The bearing elements 148A, 148C, 149A, 149C are designed in the manner of bearing clasps or bearing claws, for example, and engage with the bearing receptacles 148B, 148D, 149B and 149D, which are designed as slots or circumferential grooves, for example.

[0292] The bearing element 148C is for example located so as to be stationary with respect to the towing vehicle coupling 60. The bearing element 149C is for example located at the support 50, e.g. at the support plate 52 on the side averted from the driver 20.

[0293] The gimbal gearing 146 has pivot axes S1Y, S2Y extending at an angle, for example at right angles, to the drive rotational axis MD.

[0294] The other gimbal gearing 147 has pivot axes S3Y, S4Y likewise extending at an angle, for example at right angles, to the drive rotational axis MD.

[0295] The pivot axes S1Y, S2Y, S3Y and S4Y form rotational degrees of freedom of movement which differ from pivot axes S1Y, S2Y and are provided and suitable for providing or maintaining the motion coupling between the driver 20 and the mating coupling element 81.

[0296] In addition the mounting device 140A has a degree of freedom of translational movement along the sliding axis TL.

[0297] This degree of freedom of translational movement and/or the rotational degrees of freedom of movement, provided by the pivotability about the pivot axes S1Y, S2Y, S3Y and S4Y, form or make available the degrees of freedom of movement BF.

[0298] Like the adjustment bodies 31, 32, the adjustment bodies 31B, 32B can form a housing 100, which accommodates components of a retaining device and/or a driver mounting device and/or the driver at least in the idle position R.

[0299] The adjustment element 31 for example forms an outer housing body 101, in which the adjustment element 32 is accommodated. The adjustment element 32 can also form a housing body, namely an inner housing body 102. The housing 100, e.g. the housing bodies 101, 102, bound(s) an interior 104, in which the retaining device 140 can be accommodated as a whole, for example. The housing 101 has a through-opening 103, through which the driver 20 projects in front of the housing 101 in the working position AS. In the idle position R the driver 20 is moved closer to the housing 101, so that the driver mounting device 25 and preferably a portion of the driver 20 as well dip into the housing 101.

[0300] At this point it should be mentioned that there may be kinematics in which the driver 20 projects not at all or less far in front of the housing 101 in the idle position R, for example if the adjustment contours 33, 34 were to extend farther towards the adjustment element bearing 35.

[0301] The adjustment contours 33, 34 act as resetting contours for moving the driver 20 from the working position AS into the idle position R. An adjustment contour in the form of a drive contour is easily possible as well, as indicated diagrammatically in FIG. 8, for example. The adjustment contour 33 can for example be located opposite a drive contour 33V, so that the two contours 33 and 33V form a guide link, in particular a guide groove or a guide slot. The adjustment body 51 engaging between the contours 33, 33V is actuated towards the working position AS by the drive contour 33V at a relative movement of the adjustment elements 31, 32 from a position assigned to the idle position R into a position assigned to the working position AS (according to FIGS. 2 and 6). In this case the spring assembly 51 is not required or can have a lower spring force. In this configuration the magnet assembly with the magnet 23 can be sufficient to hold the driver 20 non-rotatably at the mating coupling element 81 with respect to the drive rotational axis MD.

[0302] In a sensor apparatus 110 according to FIGS. 16 and 17, an adjustment device 130 with adjustment elements 131, 132 is provided.

[0303] The adjustment elements 131, 132 can be designed as disc bodies or wall bodies, for example. It is preferred, however, if the adjustment elements 131, 132 are designed as tubular bodies or sleeve bodies, similar to the adjustment elements 31, 32. The adjustment elements 131, 132 are for example rotatable relative to each other, in particular about a rotational axis DA.

[0304] The adjustment element 132 is mounted so as to be movable, e.g. displaceable, along an adjustment path VS with respect to the adjustment element 131. It is for example possible that the adjustment elements 131, 132 are motion-coupled to each other by means of an actuating gear mechanism 295. The actuating gear mechanism 295 has for example mutually engaging, diagrammatically indicated screw contours 296, 297 of the adjustment elements 131, 132, so that the adjustment element 132 is moved along the adjustment path VS, for example at a rotation of the adjustment element 131 about a rotational axis DA.

[0305] An adjustment contour 133, for example in the manner of a recess or slot 133A, is located at the adjustment element 132. One of the adjustment bodies 51 engages with the adjustment contour 133 or slot 133A.

[0306] It is advantageous if at least two, preferably three or further, adjustment contours 133, with each of which an adjustment body 51 engages, are provided at angular distances with respect to the rotational axis DA.

[0307] If the adjustment element 132 is in the position assigned to the idle position R, the adjustment body 51 is supported at the adjustment contour 133, so that the driver 20 cannot come into contact with the mating coupling element 81. If the adjustment element 132 is moved into the position assigned to the working position AS (FIG. 17), however, the adjustment contour 133 comes out of engagement with the adjustment body 51, which is then in an inner or central region of the recess or slot 133A, i.e. in a movement recess 136, for example. The adjustment body 51 is for example located at an already described retaining device 40 or 140. The adjustment body 51 is distanced from the adjustment device 130 in the working position AS, so that the driver 20 is movable relative to the adjustment device 130 with the degrees of freedom of movement BF, in order to maintain the contact with the mating coupling element 81. This contact is for example provided by the spring assembly 53 and/or by the magnet 23.

[0308] It is advantageous if the sensor apparatus 10, 10A 110 as a whole or a part thereof, e.g. the adjustment device 30, 130, is located in a protective housing, for example a protective housing 200. The protective housing 200 is designed in the manner of a protective hood, for example. The protective housing 200 is preferably yielding in the direction of the drive rotational axis, for example telescopic, elastically resilient or the like.

[0309] In FIG. 13 a further configuration of a protective housing in the form of a protective housing 300 is indicated. The sensor apparatus 10, e.g. the adjustment device 30 and/or the mounting device 40A and/or the retaining device 40 and/or the actuating drive 55, for example the drive motor 55A, can be located in the protective housing 300. The protective housing 300 preferably has a recess 301, through which the mating coupling element 81 can come into engagement with the driver 20. The protective housing 300 is indicated diagrammatically. The protective housing 300 is for example designed as a metallic housing, a plastic housing or the like. The protective housing 300 can also be designed in the manner of a module which comprises the sensor apparatus 10 and can be mounted at the towing vehicle coupling 60.