DE102015115470A1 - REMOVABLE TRAILER ATTACHMENT - Google Patents

Abstract

In order to provide a more convenient, easy-to-build solution for detaching a hitch bar, the invention provides a hitch (10) having a detachable hitch bar (12) and a receptacle (14) to be mounted on a towing vehicle, into which the hitch bar (12) is removable to introduce, and a locking device (18) for locking the coupling rod (12) in the receptacle (14), wherein the locking device (18) has a wedge element (20) for wedging the coupling rod (12) in the form-fitting rear handle with the receptacle (14). for locking and further wherein a striking mechanism (26) for knocking out the wedge member (20) is provided for releasing the lock.

Description

The invention relates to a trailer hitch with removable coupling rod, as for example from the DE 103 55 854 A1 is known.

For aesthetic reasons, permanently installed trailer hitches for passenger cars are hardly marketable. Very high-quality passenger cars are sometimes provided with original outfitting equipment with a pivotable from a pivot position in an operating position trailer hitches. Such systems are often very bulky and technically complex and hardly suitable for retrofitting. More cost-effective for both original equipment and retrofits are removable trailer hitches, where a coupling rod can be removed when not in use and stored in another location, for example, stowed in the trunk, can be transported. The coupling rod is mounted only for operation of the trailer hitch on the motor vehicle. An example of a vertically removable towbar is in the DE 103 55 854 A1 disclosed.

The invention has for its object to provide a removable trailer hitch in the DE 103 55 854 A1 further explained in terms of ease of use.

Preferably, the advantages of the prior art trailer hitch should be maintained.

To solve this problem, the invention proposes a removable trailer hitch according to claim 1.

Advantageous embodiments are the subject of the dependent claims.

The invention provides a removable trailer hitch with a coupling rod and a to be fixed to a towing vehicle receptacle, in which the coupling rod is to be introduced detachably, and a locking device for locking the coupling rod in the receptacle, wherein the locking means a wedge member for wedging the coupling rod in the form-fitting rear handle with has the receptacle for locking and further wherein a striking mechanism for knocking out the wedge element for releasing the lock is provided.

It is preferred that the impact mechanism comprises a motor-driven flywheel element and a transmission for delaying transmission of an angular momentum of the flywheel movement to the wedge element.

It is preferred that the flywheel is connected via a traction means in such a way with the wedge element, that the traction means is loose in the idle state and is tensioned only after rotation of the flywheel to transmit the angular momentum abruptly to the wedge element.

It is preferred that a joint socket is provided on one of the elements coupling rod or receptacle and on the other of the elements a hinge pin is provided to form a hinge with a rotation axis, the intended use with at least one directional component transverse to the direction of travel and horizontal is, wherein the socket for insertion of the hinge pin is formed from below and for executing the hinge pin down.

It is preferred that between the receptacle and the coupling rod at an area of the rotary joint in the inserted state in the intended use further above a region arranged a projection Rücksprungsausbildung for forming a contrary to a design of the coupling rod down-acting positive connection is formed by rotating the elements is engaged about the rotational axis by pulling on the coupling part of the coupling rod away from the receptacle and is disengaged by rotation in the opposite direction and that the wedge member for locking presses the projection-recess formation in the locking direction.

It is preferred that a guide for guiding the wedge element is formed on the receptacle.

It is preferred that the wedge element is biased into its locking position.

A preferred trailer hitch comprises a trailer socket, wherein an actuator for actuating the impact mechanism is formed on the trailer socket.

It is preferred that the trailer rod mechanically engages when inserted into a positive connection and the wedge element engages mechanically in the locking position.

It is preferred that the receptacle comprises an ejector, the ejector being adapted to be actuated by the wedge member when knocked out by the striking mechanism and the ejector, when actuated by the wedge member, further transmitting an ejection pulse is formed on the coupling rod.

In contrast to the detachable towbar according to the DE 103 55 854 A1 Now is no longer provided a rotation of the coupling rod about a vertical axis for locking, but advantageously provided a wedge lock.

In a preferred embodiment, the coupling rod is inserted vertically from below into a receptacle or to a holder which is to be fastened to the towing vehicle. Preferably, two inclined surfaces are provided on the coupling rod, which are locked to complementary inclined surfaces in the fixed sleeve or the receptacle. Preferably, a pivot point, for example by an integrally formed bolt on the coupling rod, realized to allow a rotation for locking the wedge surfaces. A locking device preferably has a displaceable wedge element.

The wedge element is preferably longitudinally displaceable in the vertical direction. The locking can be done so alone by weight of the wedge element. In addition, a preload or bias can be done in the locking position, for example by a spring.

Such mutual attachment between the coupling rod and recording has been found in experiments and calculations as high strength and very safe.

However, a problem with the locking device is unlocking, especially after prolonged use in adverse weather conditions. Here can occur by dirt or corrosion seizure between the locking device and recording or coupling rod, so that unlocking is extremely sluggish possible.

Nevertheless, in order to enable easy unlocking for easy removal of the coupling rod, the invention proposes, according to one aspect thereof, a striking mechanism for knocking out the wedge member.

The impact mechanism preferably has a flywheel element to be driven by motor, for example. Particularly preferably, a flywheel is provided, which is to be rotated by an electric motor or the like in rotation, in which case after the acceleration of the flywheel, there is first a connection between the flywheel and the wedge element for knocking out the wedge element.

A particularly preferred embodiment of the impact mechanism aims at a simple construction that can be realized with low production costs. Another criterion is the size. You should build relatively compact and still generate enough momentum to knock out the wedge element.

For this purpose, a combination of flywheel element - preferably motor-driven - is preferably provided with a traction means in the impact mechanism. The traction device is initially loose in the rest position. After starting the engine then the traction device is taut and pulls the wedge from its lock. By tightening the traction means results in a sudden train connection between flywheel and wedge, so that the wedge is knocked out of its lock. The beating effect is particularly noteworthy here, especially when the wedge and the trailer hitch are in the locked position for a long time. Then it can come by environmental influences, rust, etc. to a jam. In the invention, a beating effect is generated for a secure unlocking. Such a striking effect can be easily surprised by a combination of flywheel with traction device.

Particularly preferably, the flywheel is driven by an electric motor. Due to the flywheel mass of the electric motor can be designed very low power; it is sufficient to accelerate the flywheel to a speed sufficient for a beating effect.

The unlocking is preferably initiated by an actuating element, which is arranged near the receptacle. Particularly preferred for this purpose is an arrangement in the area near a trailer socket or in a housing of a trailer socket provided. For example, a button is provided on the trailer socket.

Previous electrical systems are operated either by elements on the trailer hitch or on the vehicle, for example on the trunk. A button or other actuator, such as Control switch to provide the trailer socket, however, has significant advantages. In particular, retrofitting is very easy. Such a solution is extremely advantageous for retrofit systems.

The socket may for example be attached to a socket holder, which can be folded around a folding mechanism in the operating position down and to the rest position up. So the coupling rod can be removed and the socket can be folded upwards.

Further advantageous embodiments relate to safety aspects. The operation switch or the operating element, such as a Button, can be controlled on a trailer control, which can be part of the trailer hitch. For example, a control board is provided in the region of the trailer hitch, via which the socket is supplied with corresponding electrical connections. A control part which controls the removal mechanism and in particular the impact mechanism may be part of such a trailer control. For example, a control part be designed such that a release of the button or the other actuator only takes place when the ignition of the vehicle is off. Another criterion may be the removal of the ignition key. Such conditions can be easily queried by the on-board electrics of modern motor vehicles in the trailer hitch.

One of the advantages is that a purely mechanical locking system is provided. Even with problems with the electrical system, unintentional unlocking can not take place. The lock is secure; only when triggered is an electric actuator, such as an electric motor, operated. For example, the electric motor can only be operated when the ignition is off.

An advantage of transmitting or generating the impact effect via a traction means is also the fact that, due to the guidance of a traction means, one is free with respect to the arrangement of the individual components of the impact mechanism. The traction means can be guided by appropriate Zugmittelumlenkungen and Zugmittelführungen. For example, rollers may be provided here, or a channel is provided in which the traction means is guided.

The traction means may be, for example, a chain, a wire rope, a belt or a belt or a V-belt or the like.

Because of this due to the traction means given design freedom, for example, an electric motor can be mounted laterally and the entire mechanism of the locking device can also be mounted laterally. As a result, a very low height is possible. It is only particularly preferred that the wedge member is movable in the height direction, so that the weight of the wedge member contributes to the locking force. It can also be used a short flange; below or above the short flange can be made according to the arrangement of the engine.

A low height is particularly advantageous if the removable trailer hitch is to be installed in a rear bumper of a motor vehicle. In the area of a rear bumper, there are often problems with the height. If, however, a traction mechanism used to unlock a wedge element, you can significantly reduce the height.

Tests on prototypes have shown that the coupling rod is extremely easy to use. In particular, in a preferred embodiment, the trailer rod can easily engage even without any electrical operation. An unlocking is preferably possible only via electrical actuation.

Instead of or in addition to a preferred electrical actuation of the impact mechanism is in a further possible embodiment of the trailer coupling of the impact mechanism mechanically actuated. Accordingly, not only the locking takes place purely mechanically, it can also be a purely mechanical release done. The corresponding actuation may be provided instead of the electric impact mechanism or in addition to the electric impact mechanism.

According to the further embodiment, it is preferred that the impact mechanism can be actuated by an impact pulse from the outside.

It is preferable that the striking mechanism has a striker and a striker guide in the receptacle.

It is preferred that the firing pin in its inserted state with an upper end of the wedge member detects and has a striking surface for a hammer at its protruding from the receptacle lower end.

It is preferred that the receptacle has a fold-out socket, which limits the firing pin guide in the unfolded state.

Embodiments of the invention will be explained in more detail with reference to the accompanying drawings. It shows:

1 a section through an embodiment of a trailer hitch with a receptacle, a wedge member, an upper part of a coupling rod and a locking device including a striking mechanism;

2 a perspective view of the trailer hitch of 1 , where one Housing shell of the impact mechanism has been omitted;

2a another perspective view of the trailer hitch of 1 including an impact mechanism, wherein a housing shell of the impact mechanism has been omitted;

2 B another perspective view of the trailer hitch of 1 including an impact mechanism, wherein a housing shell of the impact mechanism has been omitted;

3 an exploded view of some components of the detachable trailer hitch with the coupling rod, the vehicle-mounted receptacle and components of the locking device;

4 a side view of the coupling rod of the removable trailer hitch;

5 a section along line AA of 4 ;

6 a section along line BB of 4 ;

7 to 10 each a section along the line CC, DD, EE or FF of 4 ;

11 to 14 a portion of the coupling rod to be received in the receptacle, in different representations;

15 a front view of the recording;

16 a side view of the recording;

17 a section along the line AA of 15 ;

18 a plan view of the recording;

19 a schematic representation of another embodiment of the trailer hitch with a trailer socket and operating switch and an indicated control; and

20 a representation comparable 1 a further embodiment of the trailer hitch with the receptacle, a wedge member, an upper part of the coupling rod, a locking device including the impact mechanism and with an ejector;

21 a representation comparable 1 a further embodiment of the trailer hitch with the receptacle, a wedge member, an upper part of the coupling rod, a locking device including the striking mechanism, which is additionally or alternatively mechanically actuated, and with an ejector;

In the 1 to 3 is a removable trailer hitch 10 for attachment to a towing vehicle (not shown), such as a passenger car or the like. The trailer hitch 10 has a removable coupling rod 12 and a to be attached to the towing vehicle recording 14 for receiving a plug-in area 16 the coupling rod 12 on.

Next has the trailer hitch 10 a locking device 18 for locking the coupling rod 12 in their operating position within the recording 14 on.

The locking device 18 has a wedge element 20 on, by means of which the insertion area 16 the coupling rod 12 in a positive engagement within the receptacle 14 is wedged, so the coupling rod 12 in the recording 14 to lock.

To form the form-fitting engagement, the coupling rod 12 and the recording 14 a complementary projection-recess formation 22 on, so the elements coupling rod 12 and recording 14 positively engaging behind by means of the wedge element 20 can be wedged.

Next is at an insertion of the recording 14 between the coupling rod 12 and the recording 14 a hinge 24 educated.

Projection-return training 22 and swivel 24 are arranged to each other and formed such that a relative rotation of the elements coupling rod 12 and recording 14 around a direction of rotation of the rotary joint 24 the tab springback training 22 brings in positive engagement and disengages a rotation in the other direction.

Next, the trailer hitch has a striking mechanism 26 on, by means of which the wedge element 20 for unlocking and releasing the coupling rod 12 can be knocked out of its wedging position.

The impact mechanism 26 has a momentum element 28 , which - in particular powered by a motor - in swinging motion is displaceable, and a play gearbox 30 on which the momentum element 28 with the wedge element 20 connects so that the kinetic energy of the flywheel 28 abruptly transferable to the wedge element.

In a preferred embodiment, the transmission 30 designed as a traction mechanism. Accordingly, it is in a preferred embodiment, a traction means 32 , such as a band, a chain, a wire rope or a belt or the like provided, which with one end to the flywheel element 28 and with its other end to the wedge element 20 is fixed and can be tensioned by a swinging motion of the flywheel element.

In a preferred embodiment, the flywheel element 28 as a flywheel 34 formed, which by an electric motor (not shown) is set in rotation. The traction device 32 , such as a drawstring, is at one end to one with the flywheel 34 connected rotary shaft 36 attached and over deflection 38 , such as rollers or the like, to the wedge member 20 guided. The traction device 32 is sized by the length such that the rotating shaft 36 first a little - until a few times - turned around before the traction means 32 spans and the kinetic rotational energy of the flywheel 34 at the moment of tightening abruptly on the wedge element 20 transfers.

The wedge element 20 is preferably in a vertical guide 40 in the recording 14 guided so that it is to move for locking down and unlocking upwards. As a result, the weight of the wedge element, which is preferably made of metal, is already effective 20 for urging the wedge element 20 in the locking position. In addition, but need not, a biasing element 42 , Such as a mechanical spring - eg compression spring - be provided, which is the wedge element 20 biased into the locking position.

To make the swivel joint 24 is in a preferred embodiment at a lower edge of the receptacle 14 one joint socket left and right 44 with a semi-cylindrical recess 46 in the lateral boundary wall 48 the recording 14 educated.

The recording 14 is preferably formed as a rectangular sleeve made of solid metal material. For example, it can be welded together from two halves.

At the insertion area 16 the coupling rod 12 stand left and right cylindrical projections, cylinder projections 50 , in front, as a hinge pin 52 of the swivel joint 24 Act.

Through the semi-cylindrical recess 46 are the sockets 44 open downwards and so can when inserting the insertion area 16 the coupling rod 12 through a lower opening 54 the recording 14 in a receiving channel 56 into the sockets 44 be introduced.

The cross-sectional profiles of the receiving channel 56 and the plug-in area 16 are configured non-circular in a complementary manner, in particular, for example, rectangular in profile, so that twists of the coupling rod 12 within the recording channel 56 be prevented.

In addition, the positive connection between the hinge pins 52 and the semi-cylindrical recesses 46 as positive locking against rotations of the insertion area 16 around a vertical axis.

The recesses 46 may be formed extended beyond the semi-cylindrical shape to form a guide upon insertion.

The insertion area 16 has at its free end a front slope for detection by the wedge element 20 and a rear slope 60 on top, with a first rear slope 62 within the recording channel 56 can interact. The receiving channel 56 points upward after the first rear slope 62 a sloping step 64 and then a second rear slope 66 on.

The free end of the insertion area 16 is complementarily shaped and faces upwards following the rear slope 60 an angled contact surface 68 on which the upper step edge 70 the sloping step 64 the recording 14 can capture. At the angled contact surface 68 closes at the coupling rod 12 a second rear slope 72 in the locking position parallel to the second rear slope 66 the recording 14 to come to rest.

Through the sloping step 64 and the angled contact surface 68 as well as the two first and second rear slopes 60 . 62 . 66 . 72 is in each case a projection and a return to the recording 14 and a complementary recess and projection on the insertion area 16 the coupling rod 12 so as to make the tab-recess formation 22 to build. A rear protruding upper projection 74 at the upper end of the insertion area 16 the coupling rod 12 engages behind the oblique step in the locking position 64 and is thus in positive engagement with the recording. The wedge element 20 urges the upper projection in the locked position 74 deeper into the rear grip.

To unlock the wedge element 20 through the impact mechanism 26 pulled up. Then the top of the insertion area 16 around the axis of rotation 76 of the swivel joint 24 be pivoted forward and comes so out of engagement with the step 64 , The coupling rod 12 falls then already by their own weight from the detection between hinge pin 52 and joint socket 44 and is so easy to pull down.

To reinsert the coupling rod 12 with its insertion end through the lower opening 54 in the receiving channel 56 pushed. First, the second rear slope 72 at the top of the insertion area 16 the coupling rod 12 along the first rear slope 62 led the recording until the upper end of the wedge element 20 detected. Will then the coupling rod 12 further led up, the hinge pin arrives 52 in his corresponding socket 44 and by rotation of the upper end of the insertion area 16 around the axis of rotation 76 to the rear reaches the upper projection 74 in his rear grip with the oblique step 64 ; and the wedge element by its own weight and / or the possibly provided biasing element 42 in his in 1 brought shown locking position.

The entire insertion process can be done without the impact mechanism 26 and without any operation of any electric motor or actuator or the like. Only for unlocking the impact mechanism 26 , For example, by briefly starting an electric motor operated. The electric motor can be designed with very low power; it is enough, the momentum element 28 to set in motion. For this purpose, little power and little power is necessary, so that the operation can also be performed very energy efficient.

As far as directions such as "top", "bottom", "front" or "rear" have been given, the directional information refers to the intended use of the trailer hitch on a towing vehicle. The direction is defined by the direction of travel of the tractor to the front; The trailer hitch is usually attached to the rear of the vehicle.

1 shows a section through the recording 14 with the insertion area inserted therein 16 the coupling rod 12 as well as above the recording 14 attached impact mechanism 26 ,

2 shows a perspective view of the trailer hitch 10 , wherein a housing shell of the impact mechanism 26 has been removed for clarity.

2a and 2 B show more perspective views of the trailer hitch 10 from different angles, with a housing shell of the impact mechanism 26 for better illustration has been removed and where hidden elements have been represented by phantom lines.

3 shows an exploded view of the essential parts of the trailer hitch 10 ,

In the 4 to 14 are different representations of the coupling rod 12 and sometimes only their Einsteckbereich 16 ( 11 to 14 ).

The 15 to 18 show different views of the recording 14 ,

In 19 is a schematic representation of another embodiment of the trailer hitch 10 shown, with even more parts of the trailer hitch 10 are shown schematically. The structure of the recording 14 , the coupling rod 12 and the wedge element 20 is the same as in the 1 to 18 shown and explained above.

As in 19 shown, results from the formation of the transmission 30 as a traction mechanism greater freedom in the design and construction of the trailer hitch 10 , The traction device 32 can with appropriate deflection 38 be redirected It is also a deflection of the traction device 32 possible to the side. In this respect, the impact mechanism 26 with momentum element 28 and drive 78 , for example, designed as an electric motor 80 , - as in 19 shown - the side of the recording 14 be arranged. As a result, the overall height of the trailer hitch can be kept very small overall, which has significant advantages to the arrangement of the trailer hitch 10 in the area of a rear bumper of the towing vehicle brings.

In 19 is still another outlet 82 for inserting a plug of the trailer for the purpose of electrical connection of the trailer to the towing vehicle. The power outlet 82 is on a socket 84 attached, which can be folded away when not in use, for example. For this purpose, the socket carrier 84 with a corresponding hinged joint 86 for example, at the recording 14 or hinged their attachment.

Next is in 19 another control 88 indicated by means of the drive 78 the impact mechanism 26 can be controlled. The control 88 can be part of an electrical module 90 to control the trailer's electrical system.

In a particularly preferred embodiment is an actuating element 92 for actuating the drive 78 at the socket 82 intended. Here, electrical lines are provided anyway, so that the integration of the actuating element 92 , which, for example, as a button 94 can be trained, easily possible.

The control 88 may comprise a safety circuit such that the actuating element 92 and / or the drive 78 can only be activated under certain conditions. For example, this can only be done with the ignition switched off and / or with the ignition key removed. Both conditions can be queried on the on-board electrical system of a standard passenger car.

The power outlet 82 and the controller 88 can in a comparable manner in other embodiments of the trailer hitch 10 , such as at the in 1 to 18 shown, be provided.

As in the 20 and 21 shown, the recording can 14 in a preferred embodiment, an ejector 112 exhibit. Preferably, the ejector 112 rotatable on the receptacle 14 stored and has at its one end a first projection 114 and at the other end a second lead 116 on. Preferably, the wedge member 20 a lead 96 on.

ejector 112 and wedge element 20 are formed and arranged to one another such that the wedge element 20 if this by the impact mechanism 26 is knocked out shortly before reaching its end position the ejector 112 actuated. Preferably, in the knocking out the projection touch 96 of the wedge element 20 and the first lead 114 the ejector 112 , causing a pulse from the wedge element 20 on the ejector 112 is transmitted. The ejector 112 is formed and to the coupling rod 12 arranged that he due to the operation by the wedge element 20 at the other end with his second lead 116 a Auswerfimpuls on the coupling rod 12 transmits, so that these easily from the recording 14 solves.

As in 21 shown, the impact mechanism can 26 but also be operated mechanically. The 21 shows a further embodiment with a mechanical actuation 100 the impact mechanism 26 , wherein comparable parts bear the same reference numerals as in the previously explained embodiments. The further embodiment corresponds to the following explained in more detail differences in 1 to 18 shown embodiment.

According to this further embodiment, the impact mechanism 26 a firing pin 102 up in a striker guide 104 in the recording 14 is provided, can be plugged.

In the in 20 shown plugged state detects the firing pin 102 with an upper end 106 in its inserted state, the wedge element 20 and stands with its lower end 110 down from the recording 14 out. At this protruding end 108 is a clubface 110 provided, which can be acted upon with an impact tool not shown here, in particular a hammer or the like. This allows the wedge element 20 from his locked position beat.

The mechanical actuation 100 may instead of the electrical actuation, ie instead of the upper head with the flywheel element 28 and the traction means 32 be provided; but it is also possible, the mechanical operation 100 in addition to the in 1 illustrated embodiment of the impact mechanism 26 with momentum element 28 and traction means 32 provided.

The firing pin 102 can when not in use from the firing pin guide 104 be pulled out and stowed safely.

LIST OF REFERENCE NUMBERS

10

 trailer hitch

12

 coupling rod

14

 admission

16

 insertion

18

 locking device

20

 key member

22

 Projection-return training

24

 swivel

26

 impact mechanism

28

 swing element

30

 transmission

32

 traction means

34

 flywheel

36

 rotary shaft

38

 deflecting

40

 vertical guidance

42

 biasing member

44

 socket

46

 semi-cylindrical recess

48

 boundary wall

50

 cylinder projection

52

 pintle

54

 lower opening

56

 receiving channel

58

 front slope (coupling rod)

60

 first rear slope (coupling rod)

62

 first rear slant (intake)

64

 oblique step

66

 second rear slant (intake)

68

 Angled contact surface

70

 upper step edge

72

 second rear slope (coupling rod)

74

 upper projection

76

 axis of rotation

78

 drive

80

 electric motor

82

 socket

84

 socket carrier

86

 folding joint

88

 control

90

 electromechanical assembly

92

 actuator

94

 button

96

 Projection (wedge element)

100

 mechanical actuation

102

 firing pin

104

 Striker guide

106

 top end

108

 lower end

110

 Playing surface

112

 ejector

114

 first projection (ejector)

116

 second projection (ejector)

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 10355854 A1 [0001, 0002, 0003, 0017]

Claims (15)

Trailer hitch ( 10 ) with a removable coupling rod ( 12 ) and a to be fastened to a towing vehicle recording ( 14 ) into which the coupling rod ( 12 ) is detachably insertable, and a locking device ( 18 ) for locking the coupling rod ( 12 ) in the recording ( 14 ), wherein the locking device ( 18 ) a wedge element ( 20 ) for wedging the coupling rod ( 12 ) in the form-fitting rear grip with the receptacle ( 14 ) and further comprising a striking mechanism ( 26 ) for knocking out the wedge element ( 20 ) is provided for releasing the lock. Trailer hitch ( 10 ) according to claim 1, characterized in that the impact mechanism ( 26 ) a motor-driven flywheel element ( 28 ) as well as a transmission ( 30 ) for delaying transmission of a momentum of the momentum element movement to the wedge element (US Pat. 20 ) having. Trailer hitch ( 10 ) according to claim 2, characterized in that the flywheel element ( 28 ) via a traction means ( 32 ) in such a way with the wedge element ( 20 ), that the traction means ( 32 ) is loose at rest and only after initial movement of the flywheel element ( 28 ) is urged to abruptly apply the momentum to the wedge element ( 20 ) transferred to. Trailer hitch ( 10 ) according to claim 2 or 3, characterized in that the flywheel element ( 28 ) a flywheel ( 34 ). Trailer hitch ( 10 ) according to one of the preceding claims, characterized by a trailer socket ( 82 ), wherein an actuating element ( 92 ) for electrically actuating the impact mechanism ( 26 ) on the trailer socket ( 82 ) is trained. Trailer hitch ( 10 ) According to one of the preceding claims, characterized in that the percussion mechanism ( 26 ) is actuated by a shock pulse from the outside. Trailer hitch ( 10 ) according to claim 6, characterized in that the impact mechanism ( 26 ) a firing pin ( 102 ) and a firing pin guide ( 104 ) in the recording ( 14 ) having. Trailer hitch ( 10 ) according to claim 7, characterized in that the firing pin ( 102 ) in its inserted state with an upper end ( 106 ) the wedge element ( 20 ) and at his from the recording ( 14 ) projecting lower end ( 108 ) has a clubface for a hammer. Trailer hitch ( 10 ) according to one of claims 7 or 8, characterized in that the receptacle ( 14 ) has a fold-out socket, which in the unfolded state, the firing pin guide ( 104 ) is limited to the outside. Trailer hitch ( 10 ) according to one of the preceding claims, characterized in that on one of the elements coupling rod ( 12 ) or recording ( 14 ) a socket ( 44 ) and at the other of the elements a hinge pin ( 52 ) of a swivel joint ( 24 ) with a rotation axis ( 76 ), which is to be arranged in the intended use with at least one directional component transverse to the direction of travel and horizontally, wherein the socket ( 44 ) for inserting the hinge pin ( 52 ) from below and to perform the hinge pin ( 52 ) is designed to be open at the bottom. Trailer hitch ( 10 ) according to claim 10, characterized in that between the receptacle ( 14 ) and the coupling rod ( 12 ) on one of the swivel joints ( 24 ) in the inserted state in the intended use further above the region arranged a projection-return education ( 22 ) for forming a counter to a design of the coupling rod ( 12 ) down-acting positive engagement is formed by turning the elements about the direction of rotation by pulling on the coupling part of the coupling rod ( 12 ) away from the recording ( 14 ) is engaged and disengaged by rotation in the opposite direction and that the wedge element ( 20 ) for locking the projection return formation ( 22 ) in the locking direction. Trailer hitch ( 10 ) according to one of the preceding claims, characterized in that on the receptacle ( 14 ) a guided tour ( 40 ) for guiding the wedge element ( 20 ) is trained. Trailer hitch ( 10 ) according to one of the preceding claims, characterized in that the wedge element ( 20 ) is biased in its locking position. Trailer hitch ( 10 ) according to any one of the preceding claims, characterized in that the trailer rod mechanically locks when inserted into a positive connection and the wedge element ( 20 ) mechanically engages in the locking position. Trailer hitch ( 10 ) According to one of the preceding claims, characterized in that the receptacle ( 14 ) an ejector ( 112 ), wherein the ejector ( 112 ) is adapted from the wedge element ( 20 ) To be operated when this by the impact mechanism ( 26 ) and wherein the ejector ( 112 ), when coming from the wedge element ( 20 ) is actuated, further for transmitting a Auswerfimpulses on the coupling rod ( 12 ) is trained.

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