Door drive and motor vehicle equipped with it

Abstract

The invention relates to a door drive with a drive motor (230) and a connecting rod (20) transmitting tensile and / or compressive forces, which has a longitudinal axis (L) and can be displaced along its longitudinal axis (L) by means of the drive motor (230), wherein the connecting rod (20) is connected to the drive motor (230) via a belt drive (21), wherein the belt drive (21) comprises a flexible belt (200) connected to the connecting rod (20), which can be guided over a drive pulley (210) driven by the drive motor, and wherein, viewed in the direction of travel of the belt, a tensioning roller (212) for the belt (200) is provided both upstream and downstream of the drive pulley (210). A motor vehicle equipped with such a door drive is also described.

Description

[0001] The invention relates to a door drive comprising a drive motor and a coupling rod that transmits tensile and / or shear forces, which has a longitudinal axis and is displaceable along its longitudinal axis by means of the drive motor. Furthermore, the invention also relates to a motor vehicle equipped with such a door drive.

[0002] Motor vehicles typically have at least one door hinged to the body. These doors are increasingly being designed autonomously, allowing them to open and close completely without manual intervention. Such a door is also referred to as a "smart door." The reasons for this autonomous design include, on the one hand, increased comfort and safety, but also the prospect of autonomous, driverless vehicles. Without such a smart door, these vehicles would not be able to continue their journey if a passenger leaves the door open after boarding or alighting. Such smart doors are therefore considered one of the prerequisites for fully autonomous driving.

[0003] To make a motor vehicle door autonomous in this sense, in addition to appropriate control devices, appropriate door drives of the type mentioned above are required. These, via the drive motor, generate tensile and / or shear forces on the coupling rod when the latter is attached between the door and a suitable fixed point, e.g., on the vehicle body. These tensile and shear forces then cause the desired opening or closing of the door.

[0004] The known embodiments of such door drives are often designed to convert a rotary motion of the drive motor into a translational motion (stroke) by means of the coupling rod in order to push or close the door. Previous embodiments use coupling rods based on threaded spindles, gear teeth, or cable drives that are coupled to a rail. An example of such a door drive with a coupling rod in the form of a threaded spindle is disclosed in US 2023 / 0151673A1.

[0005] The disadvantage of these known systems is their complex design, which results in difficulties and high costs during both manufacturing and assembly. Furthermore, threaded spindles and gear teeth can only accommodate small center distances, which limits modularity. Cable drives coupled to a rail also have only limited adaptability to the surrounding system. However, such modularity or adaptability is regularly required, as doors vary depending on the vehicle model, but generally have very little space for additional components.

[0006] Furthermore, to date, only door drives are used which are calibrated once during production or commissioning and which cannot recalibrate themselves. This means that doors on the driver and passenger sides of a vehicle, for example, require different amounts of manual force for an assisted movement, such as when the door is pushed by a person while the drive motor carries out the movement. In addition, the manually required force will also change with increasing wear. Neither of these is desired by the vehicle manufacturer, as every door should "feel" the same in every situation, for example on an incline or on its side, and also over its service life, i.e. the same manual force assistance should be required over its service life. For this to happen, the end positions, e.g.The state of the fully open and fully closed door must be recalibrated over the lifetime, as these can change slightly with wear.

[0007] Furthermore, existing door drives have the difficulty of responding appropriately to so-called failure situations, for example following an accident. If the drive motor is de-energized, it cannot support or release the door movement. Since the translational movement of the coupling rod must be very slow, the drive motor is usually connected via a very high-ratio gearbox, for example with a gear ratio i > 80. The resulting friction results in a self-locking drive. In the failure situation described, manual operation of the door is blocked or extremely difficult, and occupants would be unable to get out of the vehicle, be rescued, or enter it. To counter this problem, mechanical clutches, such as slip clutches, are installed, which further complicate the system and increase its cost.

[0008] A further disadvantage of existing door drive systems is the unavoidable ingress of dirt. A rail of a coupled cable drive or a threaded spindle runs, for example, in the area of ​​the driver and passenger sides of the vehicle up to the A-pillar. Accordingly, in the area of ​​the conventionally installed door check strap, these are exposed in the gap or transition between the door and the body and are exposed to external weathering and dirt. This can lead to increased wear and premature failure. Encapsulation is only possible to a limited extent, for example, by means of a bellows, which only prevents dirt ingress, but not the penetration of moisture.

[0009] Finally, a disadvantage of existing door drives is that they always have a coupling rod with a rigid connection to the drive motor, for example, in the form of threaded spindles and gear teeth that are always positively engaged. Such a rigid coupling poses a significant risk of entrapment if, for example, a person places a hand in the door gap while the door is automatically closing via the door drive. In this case, the components involved will exhibit little to no deformation, causing the hand to be severely crushed until software can detect the event and intervene.

[0010] The object of the invention is to propose a door drive of the type mentioned at the outset and a motor vehicle equipped therewith, which overcome the disadvantages of the prior art with a simple structural design.

[0011] To achieve the stated object, the invention proposes the design of a door drive according to the features of patent claim 1.

[0012] A motor vehicle with a corresponding door drive is the subject of patent claim 9.

[0013] Advantageous embodiments and further developments of the invention are the subject of the dependent claims and will also become apparent from the following description.

[0014] The door drive proposed according to the invention provides that the coupling rod is connected to the drive motor via a belt drive, wherein the belt drive comprises a flexible belt connected to the coupling rod, which can be guided over a drive pulley drivable by the drive motor and, viewed in the direction of travel of the belt, a tensioning pulley for the belt is provided in front of and behind the drive pulley.

[0015] The inventive connection of the coupling rod to the drive motor via a flexible belt creates the advantages of a belt drive over direct gearing compared to existing systems. This is reflected, for example, in the better and more flexible ability to overcome different given center distances and better adaptability to different geometries of the door to be driven by the door drive.

[0016] By guiding the flexible belt over a drive pulley driven by the drive motor, the belt is divided into a tensile load side and a slack side. According to the invention, one of the tension pulleys arranged in front of and behind the drive pulley in the running direction is assigned to the load side and the slack side. The tension pulley assigned to the slack side pre-tensions the belt, while the other tension pulley is in contact with the load side. If the direction of rotation of the drive pulley is reversed, this assignment is reversed, and the previous tension pulley is merely in contact, while the other tension pulley pre-tensions the belt.

[0017] The force with which the tension pulley pre-tensions the belt can be initially adjusted, allowing any existing differences between individual doors, for example, of a motor vehicle due to different friction or weight, to be calibrated in order to ensure the manually applied force during assisted opening / closing of the door is the same for all doors. Furthermore, the applied pre-tension can also be recalibrated if necessary, for example, if the belt elongates over its service life, so that the functional reliability and magnitude of the applied tensile and / or shear forces can be maintained over the entire service life of the door drive according to the invention.

[0018] According to a proposal of the invention, the belt is designed as a finite belt section and is fastened by its ends to the coupling rod in order to move the latter along its longitudinal axis in a first and an opposite second direction depending on the direction of rotation of the drive pulley.

[0019] According to a further proposal of the invention, the belt can also be designed as an endless belt running between deflection pulleys, wherein one strand of the belt running between the deflection pulleys is guided over the drive pulley and the tensioning pulleys and the other strand of the belt is fastened to the coupling rod in order to move the latter in a first and an opposite second direction along its longitudinal axis depending on the direction of rotation of the drive pulley.

[0020] According to a further alternative proposal of the invention, the belt can also be designed as an endless belt running between deflection pulleys, wherein one strand of the belt running between the deflection pulleys is guided over the drive pulley and the tensioning pulleys and the other strand of the belt is connected to the drive pulley and the tensioning pulleys. For example, the strand of the belt not guided over the drive pulley and the tensioning pulleys can be connected via a belt clamp to an extended support plate, which also supports the drive pulley and the tensioning pulleys rotatably mounted and held on the tensioning levers. In this respect, there is a direct connection between the strand of the belt coupled to the drive pulley via the belt clamp and the tensioning levers with the tensioning pulleys rotatably mounted thereon via the common support plate. The coupling rod, in turn, is preferably connected to both deflection pulleys at both ends.In this way, the entire belt drive can also be moved depending on the direction of rotation of the drive pulley, and in doing so, the coupling rod connected to the two deflection pulleys moves along its longitudinal axis in a first and an opposite second direction.

[0021] According to a further proposal of the invention, the rotational axes of the drive pulley and the tensioning pulleys form the vertices of a triangle, and the belt is guided over the drive pulley and the tensioning pulleys, each partially wrapping around them. For example, the belt can be guided around the tensioning pulleys for approximately a quarter of their circumference and wrap around the drive pulley for approximately half their circumference.

[0022] In order to adjust the pre-tensioning force exerted by the tensioning rollers on the belt, according to a proposal of the invention it can be provided that one tensioning roller can be pre-tensioned relative to the other tensioning roller by means of a spring, the spring force of which can be adjusted by suitable adjusting means.

[0023] Furthermore, according to a further proposal of the invention, the distance between the drive pulley and the tensioning rollers can be changed in order to calibrate the pretensioning force exerted on the belt.

[0024] A further proposal of the invention provides for a substantially U-shaped tension pulley carrier with two tension levers that are rotatably mounted at a common pivot point and rigidly aligned with each other. The tension pulleys are rotatably mounted at the ends of the levers facing away from the pivot point. At least one of the tension levers comprises two lever pieces that are articulated to one another and adjustable relative to one another. Depending on the design, these lever pieces can be adjusted to one another once or can be subjected to a preset preload by means of a torsion spring in the articulated connection point.

[0025] The flexible belt of the belt drive used within the scope of the invention can, for example, be designed as a V-ribbed belt, which can solve the problem of the self-locking drive in the event of a failure situation. For this purpose, the belt is only pre-tensioned to such an extent that the normal load situations are transmitted via the belt. However, if in a failure situation the drive is de-energized and blocked and at the same time the door is pushed or pulled with manual force, the static friction of the belt can be overcome and the belt slips. This slippage-induced slipping of the belt enables the desired manual movement of the door, although the drive motor and the drive pulley are still blocked. Within the scope of the invention, it has been shown that the forces required to break loose on the door handle of a motor vehicle are approximately 40 N, i.e.Start of the assisted movement, and approximately 70 N as the maximum load due to moments of inertia, inclination of the vehicle, etc. Thus, the slip threshold for all failure situations would be approximately 80 N, so that all forces of the normal load profile can be carried out without excessive slippage.

[0026] If the belt is alternatively designed, for example, as a toothed belt with positive engagement on the drive pulley, a further proposal of the invention proposes a mechanical clutch or slip clutch between the drive pulley and the drive motor.

[0027] According to a further proposal of the invention, the threshold of decoupling or slipping can be modified or adjustable in order to achieve, for example, that the threshold is, for example, 80 N for small opening angles of the door, but for example 120 N for large opening angles. Such a modification can reduce the risk of crushing for people, since such crushing risks exist particularly at small opening angles of the door.

[0028] The inventive connection of the coupling rod via a belt drive to the drive motor using a flexible belt also offers a solution to the existing problem of dirt ingress. Firstly, traction mechanisms, especially belts, are generally much more resistant to dirt and moisture than threaded spindles or gears. Secondly, the door drive according to the invention can be designed in such a way that the belt drive, including the drive motor and any existing gear, is completely encapsulated within the door in question, and only a stop on the coupling rod is exposed to the outside elements.

[0029] The inventive use of a belt drive with a flexible belt also makes it possible to propose a door drive that overcomes the previous disadvantages of rigid coupling. A flexible belt is significantly more elastic than previously used systems, so that if, for example, a human hand is crushed by a closing door, the flexible belt initially deforms. Injurious crushing forces only occur after a certain time delay, which allows software or other control of the door drive according to the invention to stop the movement of the door drive in the meantime.

[0030] According to the invention, a motor vehicle is also proposed with a body and at least one door pivotably attached to the body about a hinge, in which a door drive according to the invention and explained above is provided between the door and the body in order to open and / or close the door automatically or with assistance by means of the door drive.

[0031] According to a proposal of the invention, a fixed point can be provided in the area of ​​the body to which one end of the coupling rod is attached and the belt drive including the drive motor can be arranged in the area of ​​the door.

[0032] The coupling rod used in the door drive according to the invention can be designed either straight or with a curved course in order to adapt the entire door drive system more flexibly to the respective space conditions, for example of a vehicle door.

[0033] Further embodiments and details of the invention are explained below using exemplary embodiments in the drawings. They show: Fig. 1 shows a perspective view of a vehicle door of a motor vehicle according to the invention equipped with a door drive according to the invention; Fig. 2 shows a schematic representation of the door drive according to the invention in a first embodiment; Fig. 3 the door drive according to the invention according to Fig. 2 in further details; Fig. 4 shows a schematic representation of the door drive according to the invention in a second embodiment; Fig. 5 the door drive according to the invention according to Fig. 4 in further details; Fig. 6 shows a schematic representation of the door drive according to the invention in a third embodiment; Fig. 7 the door drive according to the invention according to Fig. 6 in further details; Fig. 8 an embodiment of the belt drive according to the invention; Fig. 9 shows a further embodiment of the belt drive according to the invention; Fig. 10 shows a further embodiment of the belt drive according to the invention; Fig. 11 shows a further embodiment of the belt drive according to the invention; Fig. 12a the belt drive according to Fig. 2-7 in a front view; Fig. 12b the belt drive according to Fig. 12a in a perspective view; Fig. 12c Parts of the belt drive according to Fig. 12a in an exploded view.

[0034] From the Fig. 1 shows an example of a door 1 of a motor vehicle which is pivotally attached at its front end to a body of the motor vehicle (not shown) via at least one hinge in a manner not shown in detail and which has a door drive for automatically opening and closing the door 1, which is explained in detail in the following figures.

[0035] It is understood that the door drive explained below can also be used in the same way for other doors that are pivotably mounted on a hinge outside the area of ​​application of a motor vehicle.

[0036] As can be seen from the enlarged illustration according to Fig. As can be seen in Figure 2, in the illustrated first embodiment of the door drive, a coupling rod 20 is provided, one of whose ends is attached to a fixed point 12 of the body 11 of the motor vehicle, for example, adjacent to the conventionally present door check straps. The hinge on the body 11 of the motor vehicle, which defines the pivot axis of the vehicle door 1, is designated by reference numeral 10.

[0037] The coupling rod 20 runs from its end fastened to the fixed point 12 initially over a variable length section outside the motor vehicle door 1 and enters the interior of the motor vehicle door 1 via a corresponding opening in the motor vehicle door 1, in which a Fig. 3 visible door drive is arranged in the form of a belt drive 21.

[0038] According to the presentation in Fig. 3, the belt drive 21 used to drive the coupling rod 20 along its longitudinal axis L comprises a flexible belt 200, which can be designed, for example, as a V-ribbed belt, although other suitable traction means can also be used.

[0039] The flexible belt 200 is in the embodiment according to Fig. 3 is designed as a finite belt section and its two ends are each fixed in belt clamps 201, which in turn are attached to the coupling rod 20 at a certain distance from each other.

[0040] Between the two belt clamps 201, one of which is fastened to the end of the coupling rod 20 opposite the fixed point 12, the belt 200 initially runs parallel to the coupling rod 20 and is then deflected almost at right angles over a quarter of the circumference of a tensioning roller 212 lying on the belt 200 and is guided over a drive pulley 210, around which the belt 200 wraps approximately half the circumference.

[0041] As can be seen in particular from the further details in the illustrations according to Fig. As can be seen from Figures 12 a to 12 c, the drive disk 210 is driven in rotation by a drive motor 230, for example an electric motor with a downstream gear, either clockwise or counterclockwise.

[0042] If the belt 200 wrapping around the drive pulley 210 has a sufficient pre-tension on the drive pulley 210, then upon rotation of the drive pulley 210 as shown in Fig. 3 clockwise, the coupling rod 20 is displaced to the right along its longitudinal axis L and when the drive pulley 210 rotates counterclockwise, the coupling rod 20 is displaced to the left along its longitudinal axis L. This means in the Fig. 2, the coupling rod 20 is moved into or out of the door 1, causing the door 1 to open and close relative to the fixed point 12 on the body 11.

[0043] To ensure sufficient pretensioning of the belt 200, the belt drive 21 comprises, in addition to the drive pulley 210 arranged on a support plate 240, also the two tensioning rollers 212, which are arranged rotatably mounted in front of and behind the drive pulley 210 as viewed in the running direction of the belt 200 and, together with the drive pulley 210, form the corner points of a triangle.

[0044] In the illustrated embodiment according to Fig. 3 and in further detail also in accordance with Fig. In 12a to 12c, the two tensioning rollers 212 are each mounted at one end of a tensioning lever 211, which is rotatably mounted approximately in the central region at a pivot point 217 by means of plain bearing bushes 255. At the end of the tensioning lever 211 opposite the respective tensioning roller 212, both tensioning levers 211 are connected to one another via a coil spring 213, which extends over a tensioning device formed by a housing 250, a plain bearing 252, and a piston 254. The housing 250 and piston 254 are each fixed to the ends of the tensioning levers via plain bearing bushes 256 by means of screws 251.

[0045] By adjusting the tensioning device, the distance between the housing 250 and the piston 254 and thus also the distance between the two lever ends of the tensioning levers 211 opposite the tensioning rollers 212 can be changed, whereby the spring travel and the preload of the spring 213 can be adjusted.

[0046] An initial preload, i.e., initial adjustment of spring 213, can be used to ensure that sufficient preload is applied to the belt 200 running over the drive pulley 210 to transmit motion. Additionally, the initial preload can be used to determine the force transmission behavior of the belt 200, allowing differences, for example, in friction or weight, between individual doors 1 to be calibrated. This ensures that the manually applied force during the assisted opening / closing of door 1 is the same for all doors, for example, of a motor vehicle.

[0047] In addition, the coupling of the two tensioning levers 211 via the adjustable spring 213 ensures that a loss of pretension over the service life of the belt 200, for example due to an unavoidable elongation of the belt, can be compensated for via the spring 213 and can be recalibrated to this extent.

[0048] A further additional or alternative possibility of compensating for a loss of pretension of the belt over its service life can be achieved by the two belt clamps 201 used to connect the belt 200 to the coupling rod 20 being additionally mounted on a spring (not shown) in order to counteract a loss of pretension.

[0049] Another essential feature of the coupling of the two tensioning levers 211 is that the belt 200 is divided into a tension-loaded load strand and a non-loaded slack strand when guided over the rotating drive pulley 210. In the illustrated embodiment of the Fig. 3, for example, when the drive pulley 210 rotates clockwise, the left-hand section of the belt 200 is subjected to tensile stress, starting from the belt clamp 201 via the left tension pulley 212 to the drive pulley 210, while the subsequent right-hand longitudinal section of the belt 200, the right tension pulley 212, and the right belt clamp 201 are not subjected to tensile forces from the thus formed slack side of the belt 200. In this state, the left tension pulley 212, which is located on the tight side, only rests on the belt 200, while the right tension pulley 212, which is located on the slack side, simultaneously pre-tensions the belt 200 in the slack side. If the direction of rotation of the drive pulley 210 changes, the assignment of the load strand and the slack strand in the belt 200 also changes and the left tensioning pulley 212 swings in and pre-tensions the belt 200, while the right tensioning pulley 212 swings out of the previous slack strand.

[0050] This characteristic and mode of operation of the tensioning device can alternatively also be realized by other designs and arrangements of tensioning rollers 212 and drive pulley 210, which are described in the Fig. 8 to 11 and are explained below.

[0051] In the Fig. In the embodiment shown in Figure 8, the two tensioning rollers 212 are movably mounted in guides of the support plate 240 that run parallel to the coupling rod 20, as indicated by the arrow, so that the distance between the two tensioning rollers 212 can be varied. Both tensioning rollers 212 are connected via a spring 213, which in the illustrated embodiment is mounted at the pivot point of the left tensioning roller 212, while the other end of the spring 213 is connected directly to the pivot point of the right tensioning roller 212. The spring travel and thus the preload of the spring 213 can be changed and adjusted in the manner described above via the preload device 215 provided in the area of ​​the left tensioning roller 212.

[0052] In an alternative, in the Fig. 9, the drive pulley 210 and / or the two tension rollers 212 are slidably mounted in a direction opposite Fig. 8 are mounted in corresponding guides in a direction rotated by 90°, so that the distance between the drive pulley 210 and the tensioning rollers 212 can be changed. The tensioning rollers 212 are connected to one another via a common yoke 216 and are secured via fixings 220 on the yoke 216 and in the respective position in relation to the guides. A larger distance between the drive pulley 210 and the tensioning rollers 212 increases the pretension of the belt 200. After reaching the desired pretension, the tensioning rollers 212 and / or the drive pulley 210 are fixed in the desired position. In this respect, the embodiment according to Fig. 9 an adjustment device which only allows the adjustment of the initial pretension of the belt 200, without being able to adjust any possible loss of pretension over the service life.

[0053] The Fig. Another possible embodiment shown in Figure 10 shows a substantially U-shaped tension pulley carrier 211, which comprises two tension levers 211 that are rotatably mounted at a common pivot point 217 above the drive pulley 210 and rigidly aligned with one another. However, the right-side tension lever 211 is divided into two lever pieces 211a, 211b in a further joint 218, which are rotatable relative to one another about the joint 218.

[0054] The tensioning rollers 212 are rotatably mounted at the respective free end of the tensioning lever 211, whereby in the area of ​​the right tensioning lever 211, the tensioning roller rotatably mounted at the free end of the lever piece 211b can be pivoted further into the belt 200 in the joint 218. In the embodiment of the Fig. 10, a torsion spring 219 is provided in the area of ​​the joint 218, which makes it possible not only to adjust the initial preload but also to dynamically track changes in the spring force in order, for example, to compensate for an elongation of the belt 200 over its service life.

[0055] In the embodiment according to Fig. 11 is a design according to Fig. 10 similar embodiment is provided, but in contrast to the embodiment according to Fig. 10 in the area of ​​the joint 218 between the lever pieces 211a and 211b, no torsion spring is provided, but only a fixation 220 in the form of a screw connection, which in this respect also only allows an adjustment of the initial preload, without being able to dynamically track any fluctuations in the spring preload.

[0056] It should be noted that each of the Fig. 8 to 11 shown tensioning devices for the belt 200 instead of the Fig. 2, Fig. 3 and 12 a to 12 c shown clamping device of the Fig. 2 and Fig. 3 described first embodiment of the door drive can be used.

[0057] This alternative applicability also applies to the further embodiments of a door drive explained below instead of the one shown in the Fig. 2 and Fig. 3 shown door drive.

[0058] So from the Fig. 4 and Fig. 5 shows a second embodiment of the door drive according to the invention, in which the same parts have the same reference numerals as in Fig. 2 and Fig. 3 and, to avoid repetition, will not be explained again separately below unless this is necessary for understanding the invention.

[0059] In contrast to the design according to Fig. 2 and Fig. 3 shows the embodiment according to Fig. 4 and Fig. 5 shows the design of the belt 200 as an endless belt, which is designed to circulate endlessly between deflection rollers 204, 205. A strand of the belt running between the deflection rollers 204, 205, in the illustration according to Fig. 5, the upper run, is guided over the tensioning rollers 212 and the drive pulley 210 and is brought there in the manner already described to the necessary pretension, while the other run of the belt 200, in the illustration according to Fig. 5 the lower strand is fixed or secured via a belt clamp 203 at the end of the coupling rod 20 opposite the fixed point 12. Just as in the embodiment according to Fig. 2 and Fig. 3, the coupling rod 20 can thus be displaced to the right or left along its longitudinal axis L by rotating the drive pulley 210 by means of the drive motor 230, whereby the door 1 equipped with this door drive can be opened or closed if the end of the coupling rod 20 opposite the belt clamp 203 is correspondingly connected to the fixed point 12 of the body.

[0060] A particular advantage of the Fig. 4 and Fig. The advantage of the embodiment of the door drive shown in Figure 5 is that the entire belt drive 21 can be encapsulated within the door 1 in order to isolate it from the effects of weather and dirt.

[0061] Finally, the Fig. 6 and Fig. 7 shows a third embodiment of the door drive, in which the belt 200 is also designed as an endless belt and circulates endlessly between deflection rollers 204, 205. As in the embodiment according to Fig. 4 and Fig. 5 is a strand of the belt 200 running between the deflection rollers 204, 205, in the illustration according to Fig. 7 the upper run, over the drive pulley 210 and the two tension rollers 212, while the other, in the illustration according to Fig. 7 The lower run of the belt 200 is connected via a belt clamp 203 to a correspondingly extended support plate 240, which simultaneously supports the drive pulley 210 and the tensioning rollers 212 rotatably mounted and held on the tensioning levers 211. There is thus a direct connection between the run of the belt 200 coupled via the belt clamp 203 to the drive pulley 210 and the tensioning levers 211 with the tensioning rollers 212 rotatably mounted thereon via the common support plate 240.

[0062] In addition, the coupling rod 20 extends between the two deflection pulleys 204, 205 and is fastened in its respective end regions to the deflection pulley 204 on the one hand and the deflection pulley 205 on the other hand.

[0063] This means that when the drive pulley 210 rotates, the entire belt drive 21 together with the coupling rod 20 is displaced to the right or left in the direction of the longitudinal axis L. To form a door drive, as shown in the Fig. 6, the coupling rod 20 together with one of its deflection pulleys, here the deflection pulley 204, is attached to the fixed point 12 of the body 11, so that the traction means or the belt 200 is guided out of the door 1 and also back in again. In addition, this creates a pulley system with correspondingly halved forces exerted on the belt 200, whereby the drive motor 230 can be dimensioned accordingly smaller.

[0064] It is understood that instead of the embodiments according to Fig. 2 to 7 also the alternative designs of the tensioning devices according to Fig. 8 to 11 can be used.

[0065] All of the embodiments explained above can be designed with a curved coupling rod 20 in addition to the illustrated, straight-line coupling rod 20 in order to be able to adapt the system even more flexibly to the given spatial conditions of the door 1 to be driven. List of reference symbols: 1 door 10 Hinge 11 Body 12 fixed point 20 coupling rod 21 Belt drive 200 belts 201 Belt clamp 203 Belt clamp 204 pulley 205 pulley 210 drive pulley 211 clamping lever 211a inner lever piece 211b outer lever piece 212 tension pulley 213 spring 214 backdrop 215 Pre-tensioning device 216 yoke 217 Pivot point 218 joint 219 torsion spring 220 Fixation 230 drive motor 240 support plate 250 housings 251 screw 252 plain bearings 254 pistons 255 plain bearing bush 256 plain bearing bush QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This 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

[0000] US 2023 / 0151673A1

[0004]

Claims

[1] Door drive with a drive motor (230) and a coupling rod (20) transmitting tensile and / or shear forces, which has a longitudinal axis (L) and can be displaced along its longitudinal axis (L) by means of the drive motor (230), characterized by in that the coupling rod (20) is connected to the drive motor (230) via a belt drive (21), wherein the belt drive (21) comprises a flexible belt (200) connected to the coupling rod (20), which can be guided over a drive pulley (210) drivable by the drive motor and, viewed in the running direction of the belt, a tensioning roller (212) for the belt (200) is provided in front of and behind the drive pulley (210). [2] Door drive according to claim 1, characterized by that the belt (200) is designed as a finite belt section and is fastened by its ends to the coupling rod (20). [3] Door drive according to claim 1, characterized bythat the belt (200) is designed as an endless belt circulating between deflection rollers (204, 205), wherein one strand of the belt (200) running between the deflection rollers (204, 205) is guided over the drive pulley (210) and the tensioning rollers (212) and the other strand of the belt (200) is fastened to the coupling rod (20). [4] Door drive according to claim 1, characterized by that the belt (200) is designed as an endless belt circulating between deflection rollers (204, 205), wherein one strand of the belt (200) running between the deflection rollers (204, 205) is guided over the drive pulley (210) and the tensioning rollers (212) and the other strand of the belt (200) is connected to the drive pulley (210) and the tensioning rollers (212) and the coupling rod (20) is connected to both deflection rollers (204, 205). [5] Door drive according to one of claims 1 to 4, characterized bythat the axes of rotation of the drive pulley (210) and the tensioning rollers (212) form corner points of a triangle and the belt (200) is guided over the drive pulley and the tensioning rollers (212) with partial wrapping. [6] Door drive according to one of claims 1 to 5, characterized by that one tensioning roller (212) can be pretensioned relative to the other tensioning roller (212) by means of a spring (213). [7] Door drive according to one of claims 1 to 6, characterized by that the distance between the drive pulley (210) and the tension rollers (212) is variable. [8] Door drive according to one of claims 1 to 7, characterized bythat a substantially U-shaped tensioning roller carrier is provided with two tensioning levers (211) rotatably mounted at a common pivot point (217), at the ends of which levers facing away from the pivot point (217) the tensioning rollers (212) are rotatably mounted, wherein at least one of the tensioning levers (211) comprises two lever pieces (211a, 211b) connected to one another in an articulated manner. [9] Motor vehicle with a body (11) and at least one door (1) pivoted about a hinge (10) on the body (11), characterized by a door drive according to one of the preceding claims. [10] Motor vehicle according to claim 9, characterized by that a fixed point (12) is provided in the area of ​​the body (11), to which one end of the coupling rod (20) is fastened and the belt drive (21) is arranged in the area of ​​the door (1).

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