Semi-trailer with an anti-theft device and anti-theft device

Abstract

Semi-trailer (100) with a kingpin (110), wherein the kingpin (110) is arranged on an underside (U) of the semi-trailer (100) and extends from the underside (U) with a predetermined pin length (ZL) along a pin direction (ZR) running perpendicular to the underside (U), wherein the kingpin (110) is designed to be coupled to a coupling device, in particular a fifth wheel plate of a tractor unit, the semi-trailer (100) comprising: an anti-theft device (200) with a security element (210), wherein the security element (210) is arranged on the semi-trailer (100), wherein the securing element (210) is designed to be arranged at a locking position (SP) for locking a coupling between the kingpin (110) and the coupling device and at a coupling position (KP) for enabling the coupling, wherein the securing element (210) can be arranged at least in the locking position (SP) such that the securing element (210) extends with a securing length (SL) along the pin direction (ZR) from the underside (U) such that the coupling is blocked, wherein the securing length (SL) is determined based on the pin length (ZL), such that the securing length (SL) is greater than, equal to, or greater than the pin length (ZL), wherein the securing element (210) is wedge-shaped, wherein the wedge-shaped securing element (210) has at least one rear side facing the kingpin (110) and having the securing length (SL) and a sliding surface connected to the rear side, which extends from the rear side along a longitudinal direction running perpendicular to the pin direction, and the sliding surface is designed such that a height of the wedge-shaped securing element (210) increases along the longitudinal direction towards the kingpin (110), wherein the wedge-shaped securing element (210) has a wedge width (KB) which is formed along a width direction (BR) running perpendicular to the pin and the longitudinal directions (ZR, FR), which is greater than, equal to, or greater than a kingpin width (KB) of the kingpin (110) along the width direction (BR).

Description

The invention relates to a semi-trailer with an anti-theft device and an anti-theft device.Semi-trailers (or known as semi-trailers or only trailers for short) are trailers which move part of their weight onto the axles of a tractor, to which they are connected via a fifth wheel including the kingpin.Accordingly, semi-trailers can be coupled to the tractor-trailers and uncoupled. In the state in which it is decoupled from the tractor, the king pin is initially freely accessible and can be coupled again by any tractor, so that an anti-theft device is required.Anti-theft devices in the form of a lock are generally known, wherein the lock completely accommodates the king pin into an opening provided for this purpose and locks it in this opening, so that the king pin together with the lock cannot be introduced into a fifth wheel. These anti-theft devices are mounted manually, for example by a tractor driver on the king pin, and are blocked off by means of a key. Unlock is done manually and with the appropriate key. This type of anti-theft device is disadvantageous because the driver must have the correct key. Should a semi-trailer be completed by a rider of a first semi-tractor in order for the semi-trailer to be able to be coupled later by another rider of a second semi-tractor, the second rider must also have a matching key or a key transfer must take place. Furthermore, the anti-theft device must be mounted in an attached state, for example, in the driver's cab.Another disadvantage of conventional king pin locks is that the tractor rider has to mount and remove them manually.Furthermore, such anti-theft devices can be broken open by means of a bolt cutter, so that only conditional security against theft exists.The prior art is known from DE 20 2018 107 409 U1, WO 2021 / 004 829 A1, DE 195 38 306 A1, DE 20 2006 002 396 U1 and Hirsch, A. Hoyer, H. G., Mahn, U. "Aufverbeitungssysteme in Mechanical Engineering" in: Linear Rolling Guides; Wiesbaden: Springer Vieweg, 2019, pages 6 and 7; ISBN 978-3-658-26876-3.It is an object of the present invention to provide a semi-trailer with an anti-theft device and an anti-theft device, which overcome and / or at least improve one or more of the aforementioned disadvantages. In particular, it is an object of the present invention to provide a semi-trailer and an anti-theft device which can be arranged on the semi-trailer and increase security against theft.The object is achieved according to a first aspect by a semi-trailer with a king pin according to claim 1, wherein the king pin is arranged on an underside of the semi-trailer and extends from the underside with a predetermined pin length along a pin direction running perpendicular to the underside. The king pin is designed to be couplable to a coupling device, in particular a fifth wheel of a tractor. The semi-trailer comprises an anti-theft device with a securing element, wherein the securing element is arranged on the semi-trailer, in particular can be fastened movably, non-destructively and / or non-destructively. The securing element is designed to be arrangeable, in particular positionable, at a blocking position for blocking a coupling between the king pin and the coupling device and at a coupling position for enabling the coupling, wherein the securing element is arrangeable, in particular positionable, at least in the blocking position in such a way that the securing element extends with a securing length along the pin direction from the underside in such a way that the coupling is blocked.There is thus proposed a semi-trailer with an anti-theft device which is fixed to the semi-trailer and can be moved between the two locking and coupling positions. Accordingly, the anti-theft device does not have to be taken into a driver's cab and stored there. The semi-trailer can already be produced and provided with the anti-theft device. By moving the securing element into the blocking position, the coupling is prevented. The fifth wheel is generally driven towards the king pin and counter to a direction of travel through the tractor for coupling to the king pin. The saddle plate essentially has a plate shape which extends within a plane running perpendicular to the journal direction. The fifth wheel further comprises a mostly funnel-shaped opening, which extends from an outer periphery as far as a central position of the fifth wheel. Further, in this central position, the fifth wheel includes a coupling configured to receive and lock the king pin such that the king pin is connected to the fifth wheel and the semi-trailer can be pulled by the tractor. The securing element can extend along the pin direction with the securing length in such a way that access to the king pin is blocked along this coupling path between the fifth wheel and the king pin. Accordingly, the fifth wheel is pushed against the securing element, but cannot be moved further towards the king pin. Accordingly, the semi-trailer can be secured against theft and / or unauthorized access.The securing element can be configured such that, in the locked state, it is arranged at a predetermined distance from the king pin. The king pin may have a king pin plate which is fastened to the semi-trailer, in particular to the underside of the semi-trailer. The king pin plate and the king pin may be integrally formed. The king pin plate extends here substantially perpendicular to the pin direction. The king pin plate can have a predetermined diameter which is selected such that forces acting on the king pin do not lead to the king pin breaking off. Accordingly, the securing element can be spaced apart from the king pin in such a way that the securing element at least partially adjoins the king pin plate and / or is spaced apart therefrom.The anti-theft device and / or the semi-trailer can further comprise a motor which is configured to change the securing element at least between the blocking position and the coupling position. Alternatively or additionally, the anti-theft device can be designed in such a way that a manual change between the blocking position and the coupling position is made possible.The anti-theft device can further comprise a spring system which is designed to change the securing element from the coupling position into the blocking position. This can be advantageous in particular if the securing element is in a higher position in the coupling position compared to the blocking position and the spring element presses the securing element in the direction of the blocking position.The securing length is determined based on the pin length such that the securing length is greater than or equal to the pin length. The securing length can be determined such that coupling with the coupling device is not possible. The king pin may include a groove for coupling to the fifth wheel located along the king pin between the bottom and the bottom opposite end portion of the king pin. Accordingly, the securing length may be less than or equal to the pin length, such that coupling to the groove is blocked. In particular, the securing length can correspond to at least one groove length, which is a length along the pin direction from the underside to the groove or including the groove. If the safety length is equal to and / or greater than the pin length, access to the king pin is completely blocked.The anti-theft device can further comprise a locking mechanism which is designed to lock the anti-theft device at least in the locked position and the coupled position, wherein the locking mechanism is in particular bolt-shaped and / or designed as a bolt. The securing element may comprise a bolt opening for receiving the bolt-shaped locking mechanism, such that the securing element is lockable by means of the bolt-shaped locking mechanism at least in the locking position and the coupling position.The anti-theft device and / or the semi-trailer can further comprise at least one sensor unit which is designed to detect at least one of a position and a spatial arrangement of the securing element and / or of the locking mechanism and to provide sensor information characterizing the position and / or the arrangement to a controller. Additionally or alternatively, the at least one sensor unit can be configured to detect a locking state of the locking mechanism, wherein the locking state points at least to the locking position and the coupling position, wherein the sensor information further characterizes the locking state. The at least one sensor unit can be a camera or a distance meter, in particular a lidar sensor.The anti-theft device and / or the semi-trailer may further comprise the controller configured to control the motor and / or the locking mechanism, in particular based on the sensor information.The anti-theft device and / or the semi-trailer can comprise at least one communication unit which is configured to transmit and / or receive control signals and to provide the control signals to the controller, wherein the controller is configured to control the motor, the locking mechanism and / or the at least one sensor unit based on the control signals. The communication unit may be configured to provide the control signals to the controller. The controller may be configured to provide the sensor information to the communication unit. Furthermore, the communication unit can be designed to transmit information which comprises in particular the sensor information. The communication unit can be designed for transmission and / or reception by means of at least one wireless and / or wired communication channel. One of the wireless communication channels may be NFC, Bluetooth, WLAN and / or mobile radio.The anti-theft device and / or the semi-trailer can further comprise an energy store which is configured to store energy and to provide it to the motor, the controller, the communication unit and / or the at least one sensor unit. The energy store can be and / or comprise a battery. The energy store can be designed to generate and store energy when the securing element is displaced between one of the blocking and coupling positions to another of the blocking and coupling positions.The locking mechanism can be configured to unlock the securing element in the locking position. Accordingly, the securing element can be moved. This can be done by means of the motor. Alternatively or additionally, the securing element can be moved manually and / or by means of the saddle plate and the energy store can generate energy. In particular when the securing element is received in an opening of the semi-trailer for receiving at least the securing element, energy can be generated by means of the energy store when it is pushed into the opening. In a wedge-shaped configuration of the securing element described below, the securing element can be displaced into the opening in a particularly advantageous manner by means of the saddle plate.The securing element is wedge-shaped. Alternatively or additionally, the securing element can be formed in box-shaped, arc-shaped, ring-shaped, round and / or spherical fashion or in the form of a combination thereof. The arcuate securing element can at least partially surround the kingpin in a circumferential direction of the kingpin running perpendicular to the pin direction. The annular securing element can surround the king pin completely in the circumferential direction.The wedge-shaped securing element has at least one rear side facing the king pin and having the securing length and a sliding surface connected to the rear side, which sliding surface extends from the rear side along a longitudinal direction running perpendicular to the pin direction, and the sliding surface is formed such that a height of the wedge-shaped securing element increases along the longitudinal direction towards the king pin. The sliding surface can be configured such that it enables the coupling device to slide along the sliding surface. In the locked state, the wedge-shaped securing element can be arranged in such a way that, in a coupling attempt for coupling the fifth wheel plate to the king pin, the fifth wheel plate is pushed against the sliding surface. In this case, the fifth wheel can be slid along below the king pin by means of the sliding surface without the fifth wheel being able to engage with the king pin. Accordingly, the sliding surface can consist of a material or material mixture that provides low friction between the sliding surface and the fifth wheel. For example, the sliding surface can be made of metal. The sliding surface can alternatively or additionally be coated in order to allow the coupling plate to slide along the sliding surface.The wedge-shaped securing member has a wedge width formed along a width direction perpendicular to the pin and longitudinal directions that is greater than or equal to a king pin width of the king pin along the width direction. Advantageously, the wedge width corresponds to a multiple of the king pin width.In the coupling position, the securing element can be advantageously accommodated at least partially, in particular completely, in the semi-trailer, wherein the securing element is arranged such that it can be moved out of the underside from the coupling position into the blocking position for changing into the blocking position. The semi-trailer can have an opening on the underside, into which the securing element can be at least partially, in particular completely, received.The securing element can have a pivot axis and be arranged pivotably on the underside of the semi-trailer in such a way that the securing element can be pivoted at least between the blocking position and the coupling position. The semi-trailer can have fastening means to which the anti-theft device, in particular the securing element, can be fastened.The anti-theft device and / or the semi-trailer can comprise a rail guide which is formed in a straight line or in an arc shape and is arranged on the underside of the semi-trailer, wherein at least the securing element is formed to be displaceable along the rail guide towards at least the locking position and the coupling position.The safety length may be greater than or equal to the pin length. Alternatively, the safety length may be shorter such that coupling to the fifth wheel is blocked in the locked position.The controller may be configured to output an alarm signal. For this purpose, the at least one sensor unit can be designed to detect at least one of a change in the position of the securing element and to provide corresponding information to the controller. The controller may characterize the changing of the position as a foreign access based on a travel plan if no change of the blocking and / or coupling positions is scheduled at a time of the foreign access. For example, the securing element can be in the locking position when parking the semi-trailer, wherein coupling of the semi-trailer is only scheduled for the next day. If a change of the securing element is attempted and / or takes place in the meantime, the controller can output the alarm signal. The alarm signal can be output acoustically, optically and / or haptically by means of an output unit of the anti-theft device. Alternatively or additionally, the alarm signal can be transmitted by means of the communication unit to an external unit, for example a smartphone of the tractor driver.According to a second aspect, the object is achieved by an anti-theft device for a semi-trailer having a kingpin according to claim 12, wherein the kingpin is arranged on an underside of the semi-trailer and extends from the underside with a predetermined journal length along a journal direction running perpendicular to the underside, wherein the kingpin can be coupled to a coupling device, in particular a fifth plate of a tractor. The anti-theft device comprises a securing element which can be arranged on the semi-trailer, wherein the securing element, in the state arranged on the semi-trailer, is designed to be arranged at a blocking position for blocking coupling between the king pin and the coupling device and at a coupling position for enabling coupling. The securing element can be arranged at least in the blocking position in such a way that the securing element extends with a securing length along the pin direction from the underside in such a way that the coupling is blocked.Advantageous refinements are the subject matter of the dependent claims.Features which have been described with respect to the semi-trailer, in particular the anti-theft device according to the first aspect, can also be embodied as features of the anti-theft device according to the second aspect.Preferred exemplary embodiments are explained by way of example with reference to the enclosed figures. The following are shown: FIG. 1 shows a schematic illustration of a semi-trailer with an anti-theft device; FIG. 2 shows a detail of FIG. 1 ; FIG. 3 is a view of the underside of the semi-trailer; FIG. 4 shows a schematic illustration of an anti-theft device with a rail guide; FIG. 5 shows a schematic illustration of a box-shaped anti-theft device; FIG. 6 shows a schematic illustration of an arc-shaped anti-theft device; FIG. 7 shows a schematic illustration of an annular anti-theft device; and FIG. 8 shows a schematic illustration of an anti-theft device with a plurality of units.In the figures, identical or substantially functionally identical or similar elements are denoted by the same reference numerals.FIG. 1 shows a semi-trailer 100 comprising an anti-theft device 200. The semi-trailer 100 has a plurality of tires 101 and a support 102 on an underside U of the semi-trailer 100, wherein the support 102 is arranged on the underside U such that it can be cranked up and down. To support the semi-trailer 100 without a tractor, the support 102 may be deployed as shown to support the semi-trailer 100. The semi-trailer 100 further comprises a king pin 110 which extends with a pin length ZL along a pin direction ZR away from the underside. According to FIG. 1, the pin direction ZR extends perpendicular to the underside U. The underside U extends within a plane which is spanned by a direction of travel FR and a width direction BR.The semi-trailer 100 extends from a rear end portion to a front end portion along the traveling direction FR, the traveling direction facing right in FIG. 1. The king pin 110 is designed to be couplable to a fifth wheel of a coupling device, in particular a fifth wheel of a tractor. The anti-theft device 200 comprises a securing element 210, wherein the securing element 210 is arranged on the semi-trailer, in particular is movably fastened. The securing element 210 is configured to be arrangeable at a locking position SP for locking coupling between the king pin 110 and the coupling device and at a coupling position KP for enabling coupling. The securing element 210 can be arranged at least in the blocking position in such a way that the securing element 210 extends with a securing length SL along the pin direction ZR from the underside U in such a way that the coupling is blocked. In the coupling position KP, the king pin 110 is accessible and can be coupled to the fifth wheel.According to FIG. 1, the securing element 210 is wedge-shaped and is arranged on the semi-trailer 100 in such a way that it can be pivoted between the blocking position SP and the coupling position KP. Along the pin direction ZR, the securing element 210 has a rear side with the securing length SL and a sliding surface connected to the rear side, which sliding surface extends from the rear side along a longitudinal direction running perpendicular to the pin direction, here along the direction of travel FR, and the sliding surface is formed such that a height of the wedge-shaped securing element increases along the longitudinal direction towards the king pin 110. The sliding surface can be configured such that it enables the coupling device to slide along the sliding surface. In the locked state SP, the wedge-shaped securing element can be arranged in such a way that, in a coupling attempt for coupling the fifth wheel to the king pin, the fifth wheel is pushed against the sliding surface. In this case, the fifth wheel can be slid along below the king pin 110 by means of the sliding surface without the fifth wheel being able to engage with the king pin 110. Accordingly, the sliding surface can consist of a material or material mixture that provides low friction between the sliding surface and the fifth wheel. For example, the sliding surface can be made of metal. The sliding surface can alternatively or additionally be coated in order to allow the coupling plate to slide along the sliding surface. Advantageously, in the case of the wedge-shaped securing element 210, the fifth wheel is deflected underneath the king pin 110, with the result that the fifth wheel does not come into contact with the king pin 110 and damage to the king pin 110 can therefore be prevented.The wedge-shaped securing element 210 can have, in particular, a wedge width SB which is formed along a width direction BR which runs perpendicular to the journal ZR and the longitudinal directions, in FIG. 1, the direction of travel, and is greater than or equal to a king journal width KB of the king journal 110 along the width direction. Advantageously, the wedge width corresponds to a multiple of the king pin width KB.The anti-theft device 200 further comprises a motor 220, a spring system 230, a locking mechanism 240, at least one sensor unit 250, a controller 260, a communication unit 270 and an energy storage device 280, see FIG. 8, The motor 220 is configured to move the securing element 210 at least into the blocking position SP and the coupling position KP. According to FIGS. 1 and 2, the securing element 210 has a rotational axis, wherein the motor 220 can move the securing element 210 out of an opening in the semi-trailer 100 from the coupling position KP into the blocking position SP.The spring system 230 is designed to press the securing element 210 from the coupling position KP into the blocking position SP and can correspondingly support the motor 220. The locking mechanism 240 is configured to lock the securing element 210 at least in the locking position SP and the coupling position KP. For this purpose, the locking mechanism 240 can be bolt-shaped. Further, the motor 220 may be configured to actuate the locking mechanism 240. The securing element 210 may have an opening for receiving the locking mechanism 240, in particular the bolt-shaped locking mechanism 240. The anti-theft device 200 may further comprise a controller 260 for controlling the units of the anti-theft device 200.The at least one sensor unit 250 can be a camera and determine a position of the securing element 210. Further, the sensor unit 250 may output corresponding sensor information to the controller 260. The communication unit 270 may be configured to transmit and / or receive information. In particular, the communication unit 270 may be configured to receive control signals for controlling the anti-theft device 200 and provide them to the controller 260. For this purpose, the communication unit 270 can use at least one wireless and / or wired communication channel, such as Bluetooth, NFC, WIFI, mobile network, etc. The anti-theft device 200 further comprises an energy storage device 280, here a battery, for supplying the units of the anti-theft device 200 with electrical energy. The energy store 280 can be designed in such a way that it generates and stores energy by the upward movement when the securing element 210 is raised from the blocking position SP to the coupling position KP.As shown in FIG. 2, the king pin 110 has the pin length ZL and the securing element 210 has the securing length SL at least in sections, wherein the securing length SL is greater than the pin length ZL. Alternatively, the fuse length SL may be greater than or equal to the pin length ZL. The securing length SL may have a length that blocks coupling to the fifth wheel. For this purpose, the securing element 210 can be smaller than the pin length ZL.FIG. 3 shows a view of the underside U of the semi-trailer 100 and the securing width BR of the securing element 210 along the width direction BR. The king pin 110 can have a king pin plate 111, with which it can be formed integrally. The king pin plate 111 can be configured for fastening to the underside U of the semi-trailer 100 and correspondingly have the pin width ZB, which is greater than a width of the king pin 110 along the width direction BR. In this case, the king pin plate 111 has a diameter (material thickness) within the plane defined by the width and travel directions, which diameter is selected such that the king pin 110 is transferred to the semi-trailer 100, in particular during travel with a tractor, and the connection between the king pin 110 and the semi-trailer 100 is maintained. Furthermore, FIG. 3 shows that the securing element 210 is arranged at a distance from the king pin 110, in particular the king pin plate 111, along the direction of travel FR.FIG. 4 shows a view of the underside U of the semi-trailer 100 with an anti-theft device 200 and a straight rail guide 290. Additionally or alternatively, the rail guide 290 may be arcuate in shape. The securing element 210 is designed to be guided along the rail guide 290 in such a way that the securing element 210 can be arranged at least in the blocking position SP and the coupling position KP. As shown in FIG. 4, there may be a plurality of link positions KP.FIG. 5 shows a box-shaped securing element 210 which can be moved into the opening of the semi-trailer 100 into the coupling position KP and out of the latter into the blocking position SP, for example by means of the motor 220.FIG. 6 shows an arcuate securing element 210 which surrounds the king pin 110 at least in sections as viewed along the width and travel directions BR, FR.FIG. 7 shows an annular securing element 210 which completely surrounds the king pin 110 as viewed along the width and travel direction BR, FR.FIG. 8 shows the anti-theft device 200 with the security element 210, the motor 220, the spring system 230, the locking mechanism 240, the sensor unit 250, the controller 260, the communication unit 270 and the energy store 280.REFERENCE NUMERALS100 Semi-trailer 101 wheels 102 support 110 kingpin 111 kingpin plate U underside 200 anti-theft device 210 securing element A cutout KP coupling position SP blocking position ZH pin length SH safety length ZR pin direction BR width direction FR driving direction SB safety width ZB pin width 220 motor 230 spring system 240 locking mechanism 250 sensor unit 260 controller 270 communication unit 280 energy store 290 rail guide

Claims

Semi-trailer (100) having a kingpin (110), wherein the kingpin (110) is arranged on an underside (U) of the semi-trailer (100) and extends from the underside (U) with a predetermined journal length (ZL) along a journal direction (ZR) running perpendicular to the underside (U), wherein the kingpin (110) is designed to be couplable to a coupling device, in particular a fifth wheel of a tractor, the semi-trailer (100) comprising: an anti-theft device (200) having a securing element (210), wherein the securing element (210) is arranged on the semi-trailer (100), wherein the securing element (210) is designed to be coupled to a coupling device, in particular a fifth wheel of a tractor, wherein the semi-trailer (100) is designed to be locked to a rear wheel of a tractor, a locking position (SP) for locking coupling between the king pin (110) and the coupling device and at a coupling position (KP) for enabling coupling, wherein the securing element (210) can be arranged at least in the locking position (SP) such that the securing element (210) extends with a securing length (SL) along the pin direction (ZR) from the bottom side (U) such that the coupling is blocked, wherein the securing length (SL) is determined based on the pin length (ZL) such that the securing length (SL) is greater than or equal to the pin length (ZL), wherein the securing element (210) is wedge-shaped, wherein the wedge-shaped securing element (210) has at least one rear side facing the king pin (110) and having the securing length (SL) and a sliding surface connected to the rear side, which sliding surface extends from the rear side along a longitudinal direction running perpendicular to the pin direction, and the sliding surface is formed such that a height of the wedge-shaped securing element (210) increases along the longitudinal direction towards the king pin (110), wherein the wedge-shaped securing element (210) has a wedge width (KB) formed along a width direction (BR) running perpendicular to the pin and the longitudinal directions (ZR, FR) which is greater than or equal to a king pin width (KB) of the king pin (110) along the width direction (BR).The semi-trailer (100) according to claim 1, wherein the anti-theft device (200) and / or the semi-trailer (100) further comprise a motor (220) configured to change the securing element (210) at least between the blocking position (SP) and the coupling position (KP).Semi-trailer (100) according to claim 1 or 2, wherein the anti-theft device (200) further comprises a spring system (230) which is configured to change the securing element (210) at least from the coupling position (KP) into the blocking position (SP).Semi-trailer (100) according to one of the preceding claims, wherein the anti-theft device (200) further comprises a locking mechanism (240) which is configured to lock the anti-theft device (200) at least in the locked position (SP) and the coupled position (KP), wherein the locking mechanism (240) is in particular bolt-shaped.The semi-trailer (100) according to any one of the preceding claims, wherein the anti-theft device (200) and / or the semi-trailer (100) further comprise at least one sensor unit (250) configured to detect at least one of a position and a spatial arrangement of the securing element (210) and / or the locking mechanism (240) and to provide sensor information characterizing the position and / or the arrangement to a controller (260), and / or wherein the at least one sensor unit (250) is configured to detect a locking state of the locking mechanism (240), wherein the locking state points to the locking position and the coupling position, wherein the sensor information further characterizes the locking state.The semi-trailer (100) according to any of the preceding claims, wherein the anti-theft device (200) and / or the semi-trailer (100) further comprise the controller (260) configured to control the motor (220) and / or the locking mechanism (240), in particular based on the sensor information.Semi-trailer (100) according to one of the preceding claims, wherein the anti-theft device (200) and / or the semi-trailer (100) comprise at least one communication unit (270) which is configured to transmit and / or receive control signals and to provide the control signals to the controller (260), wherein the controller (260) is configured to control the motor (220), the locking mechanism (240) and / or the at least one sensor unit (250) based on the control signals.Semi-trailer (100) according to one of the preceding claims, wherein the anti-theft device (200) and / or the semi-trailer (100) further comprise an energy storage device (280) which is configured to store energy and to provide it to the motor (220), the controller (260), the communication unit (270) and / or the at least one sensor unit (250).Semi-trailer (100) according to one of the preceding claims, wherein the securing element (210) can be accommodated at least partially, in particular completely, in the semi-trailer (100) in the coupling position, wherein the securing element (210) is arranged such that it can be moved out of the underside (U) from the coupling position (KP) into the blocking position (SP) for changing into the blocking position (SP).Semi-trailer (100) according to one of the preceding claims, wherein the securing element (210) has a pivot axis and is arranged pivotably on the underside (U) of the semi-trailer (100) in such a way that the securing element (210) is pivotable at least between the blocking position (SP) and the coupling position (KP).Semi-trailer (100) according to one of the preceding claims, wherein the anti-theft device (200) and / or the semi-trailer (100) comprise a rail guide (290) which is formed in a straight line or in an arc shape and is arranged on the underside (U) of the semi-trailer (100), wherein at least the securing element (210) is formed to be displaceable along the rail guide (290) to at least the locking position (SP) and the coupling position (KP).Anti-theft device (200) for a semi-trailer (100) having a kingpin (110), wherein the kingpin (110) is arranged on an underside (U) of the semi-trailer (100) and extends from the underside (U) with a predetermined journal length (ZL) along a journal direction (ZR) running perpendicular to the underside (U), wherein the kingpin (110) can be coupled to a coupling device, in particular a fifth wheel of a tractor, the anti-theft device (200) comprising a securing element (210) which can be arranged on the semi-trailer, wherein the securing element (210) is configured to be actuated in the state arranged on the semi-trailer (100), a locking position (SP) for locking coupling between the king pin (110) and the coupling device and at a coupling position (KP) for enabling coupling, wherein the securing element (210) can be arranged at least in the locking position (SP) such that the securing element (210) extends with a securing length (SL) along the pin direction (ZR) from the bottom side (U) such that the coupling is blocked, wherein the securing length (SL) is determined based on the pin length (ZL) such that the securing length (SL) is greater than or equal to the pin length (ZL), wherein the securing element (210) is wedge-shaped, wherein the wedge-shaped securing element (210) has at least one rear side facing the king pin (110) and having the securing length (SL) and a sliding surface connected to the rear side, which sliding surface extends from the rear side along a longitudinal direction running perpendicular to the pin direction, and the sliding surface is formed such that a height of the wedge-shaped securing element (210) increases along the longitudinal direction towards the king pin (110), wherein the wedge-shaped securing element (210) has a wedge width (KB) formed along a width direction (BR) running perpendicular to the pin and the longitudinal directions (ZR, FR) which is greater than or equal to a king pin width (KB) of the king pin (110) along the width direction (BR).

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