Torque limiter and footboard with torque limiter

Abstract

The invention relates to a torque limiter (8) comprising a support element (12) with a disc-shaped part (17) and a hollow cylindrical part (13) projecting from it, wherein the hollow cylindrical part (13) is accessible to and connectable with a drive shaft (7) of a motor (5), and at least one gear (9) and at least one friction plate (19, 20) are arranged on the hollow cylindrical part (13), the at least one gear (9) and the at least one friction plate (19, 20) being in frictional contact. If a torque acting on the gear (9) exceeds a predetermined limit, the frictional contact is lost and the components slide against each other. This completely or partially prevents the transmission of torque to a motor (5), so that the motor (5) and gearbox are not damaged. The invention further relates to a running board (1) with such a torque limiter (8) which is protected against damage from misuse and impacts against obstacles.

Description

[0001] The invention relates to a torque limiter and a footboard with a torque limiter having the features of claims 1 and 15, respectively.

[0002] Running boards are often used on commercial vehicles, especially refuse collection vehicles, to transport personnel. For this purpose, the running boards are designed to be foldable and can be moved from a closed, folded position to an open, unfolded position. In the unfolded position, the running board platform is essentially parallel to the vehicle's footprint and can be accessed by personnel. In the folded position, the running board platform is not accessible.

[0003] The running boards can also be conveniently folded by motor, for example, an electric motor, at the push of a button, thus protecting the health of the personnel. However, experience shows that personnel often try to speed up the folding process by pushing or kicking. Likewise, an obstacle can cause the running board to move abruptly. There is a risk that excessive force applied to the running board could damage the transmission and / or motor.

[0004] It is the object of the present invention to propose a possibility by which the risk of damage to the transmission or engine is reduced or completely avoided.

[0005] The object is achieved by a torque limiter having the features of patent claim 1 and further by a footboard having the features of patent claim 15. Advantageous embodiments of the invention are the subject of the respective dependent claims.

[0006] The invention relates to a torque limiter, with a carrier element having a disc-shaped part and a hollow cylindrical part protruding therefrom, wherein the hollow cylindrical part can be penetrated by a drive shaft of a motor and can be connected thereto and at least one gear and at least one friction plate are arranged on the hollow cylindrical part, wherein the at least one gear and the at least one friction plate are in frictional engagement.

[0007] When assembled, the drive shaft engages with the hollow cylindrical portion of the support element and is connected to it. Preferably, the drive shaft and the hollow cylindrical portion are also rotationally fixed to one another. The torque generated by the motor, preferably an electric motor, is transmitted via the hollow cylindrical portion and the friction plate to the gear arranged there and via the friction plate. The gear is rotated and can transmit the torque to other transmission parts or a component to be moved. The gear and the at least one friction plate are frictionally engaged, which means that the frictional force between the two components ensures that they cannot move relative to one another. The friction plates are there to increase the frictional force between the gear and adjacent components.Both are also driven simultaneously by the motor, so no relative movement occurs for this reason either. However, minimal sliding movements relative to each other are acceptable and even beneficial, as this prevents the friction plate from sticking to the gear or other adjacent elements, which would be detrimental to the torque limiter's operability.

[0008] If a force acting on the transmission or the moving component generates a torque that exceeds the static friction limit between the gear and the friction plate, the static friction changes to sliding friction, and the individual components, such as the gear and the friction plate, or the friction plate and other adjacent components, can move relative to one another. This means that, for example, the gear rotates freely, or the gear and friction plate rotate freely relative to adjacent components. No or only limited torque is transferred to the motor. At the same time, damage to the gear and transmission is avoided.

[0009] Preferably, the at least one gearwheel is in contact with the at least one friction plate under a predetermined contact force, wherein the contact force is selected such that the frictional engagement can be overcome when a predetermined limit torque acting on the gearwheel is exceeded. The static friction limit can be set by the force with which the gearwheel and friction plate are pressed together. This also makes it possible to set a predetermined limit torque, above which damage is imminent. This can be determined in advance through tests for the respective drive system. This means that a component to be moved by the drive system can be pressed or kicked up to a certain degree, as long as the limit torque is not exceeded, without the gearwheel and friction plate or other components sliding over one another.

[0010] Furthermore, the hollow cylindrical part is preferably bolted to the drive shaft at the end face. This allows the drive shaft and the torque limiter to be easily secured to each other. Furthermore, a reliable transmission of torque from the motor to the torque limiter and thus to the gear is ensured. Maintenance is also simplified, as the torque limiter can be easily removed and repaired or replaced.

[0011] A particular embodiment of the invention provides that the gear has a recess on at least one side surface in which the at least one friction plate is arranged. The recess can extend from the mounting opening all the way to the toothing. Preferably, the recess is adapted to the outer contour of the friction plate, i.e., in particular, the depth of the recess is equal to or greater than the thickness of the friction plate. This has the advantage of saving installation space in the axial direction, since the friction plates are not additionally built onto the gear, or at most only slightly. Furthermore, the friction plates can be centered in this way, enabling optimal torque transmission.

[0012] Furthermore, a friction plate is preferably arranged on each side surface of the gear. This increases the static friction and improves torque transmission.

[0013] In a further embodiment of the invention, a first friction plate engages the disc-shaped portion of the carrier element. The disc-shaped portion thus acts as a counterbearing to hold the friction plate in contact with the gear.

[0014] Preferably, a second friction plate engages a pressure plate arranged on the hollow cylindrical part. The pressure plate acts as a counterbearing to hold the friction plate in contact with the gear. It is subjected to pressure so that the friction plate engages the gear with a pressure force.

[0015] If two friction plates are provided, the pressure plate presses the gear with the two friction plates preferably against the disc-shaped part of the carrier element, which then acts as a counter bearing.

[0016] Another special embodiment of the invention provides for a plain bearing to be arranged between the gearwheel, the friction plates, and the carrier element. The plain bearing is arranged on the hollow cylindrical part, and on top of this, in turn, the gearwheel and the friction plates. The friction plates can sit directly on the plain bearing or be arranged in a recess of the gearwheel such that they are not in direct contact with the plain bearing, while the plain bearing is nevertheless located between the friction plates and the carrier element. This arrangement ensures that the gearwheel can rotate freely relative to the carrier element once the limit torque is exceeded.

[0017] Particularly preferably, the dimension of the plain bearing in its axial direction is smaller than the thickness of the gear. During operation, the friction plates wear, i.e., their thickness is reduced. This, in turn, causes the components adjacent to them, such as a pressure plate or the disc-shaped part of the carrier element, to move closer to the gear. The fact that the dimension of the plain bearing is smaller than the thickness of the gear ensures that these adjacent components do not hit the plain bearing, thus preventing pressure from being exerted on the friction plates. Therefore, in the original state, gaps are formed between the plain bearing and the adjacent components.

[0018] In a further embodiment of the invention, the hollow cylindrical part has at least one groove extending from the end face; preferably, it has two opposing grooves extending from the end face. These grooves serve to allow components of the torque limiter to be arranged in a form-fitting manner on the support element, so that torque can be transmitted to these components.

[0019] The pressure plate preferably has a through-opening with at least one projection that engages in the corresponding groove of the hollow cylindrical part when the pressure plate is arranged on the hollow cylindrical part. Preferably, the pressure plate has a through-opening with two opposing projections that engage in the corresponding grooves of the hollow cylindrical part when the pressure plate is arranged on the hollow cylindrical part. The pressure plate is pushed onto the hollow cylindrical part with the through-opening so that the projections engage in the grooves. This creates a positive connection through which the torque of the motor is transferred to the pressure plate.

[0020] A further embodiment of the invention provides that at least one disc spring is arranged on the hollow cylindrical part, which generates a contact pressure under preload in the assembled state. The at least one disc spring is preferably arranged in front of the pressure plate, starting from the front side. Depending on the installation space and the desired contact pressure, two or more disc springs can also be arranged. These are preferably arranged in a package. During assembly, the disc springs are tensioned and exert a force in the axial direction of the carrier element, with which force the friction plates are pressed against the gear. Depending on the degree of tension, the contact pressure and thus the limit torque can be adjusted. In addition, the disc spring ensures that the contact pressure is maintained at least to a certain degree despite wear on the friction plates.

[0021] Preferably, the at least one disc spring is in contact with the pressure plate, since the pressure force can thereby be exerted directly on it.

[0022] Furthermore, a nut is preferably arranged at the end of the hollow cylindrical part. For this purpose, the hollow cylindrical part has a thread onto which the nut is screwed. By screwing it on, pressure is exerted on the remaining components; in particular, an existing disc spring can be tensioned in this way. The resulting pressure force increases the further the nut is screwed into the thread and can thus be regulated. Consequently, the desired limit torque can be set by carefully screwing in the nut.

[0023] Preferably, a toothed washer is arranged on the hollow cylindrical part. The toothed washer is preferably arranged adjacent to the nut to secure it and hold it in position so that the set limit torque is maintained.

[0024] The invention further relates to a running board, in particular for a refuse collection vehicle, comprising a holder and a movable part with a platform and a drive unit with a motor and a transmission, which is configured to move the movable part from a closed to an open position and back, with a torque limiter as described above. The platform of the running board is moved from a folded, closed position, in which it cannot be walked on, to an unfolded, open position, in which it can be walked on. This is done via a motor and a transmission. The torque limiter is designed to transmit a maximum, predetermined limit torque. If the acting torque is greater, it is not transmitted.This prevents damage to the transmission and / or motor due to improper handling of the platform, for example, when the operator pushes the platform up or down to accelerate the folding process, or when it hits an obstacle. In this case, forces emanating from the moving part of the platform act on the transmission components, potentially causing them to break. The operating mechanism of the torque limiter is described above; to avoid repetition, we will refrain from explaining it again.

[0025] In a further embodiment of the invention, the gear of the torque limiter is meshed with a gear element, which is connected to the movable part in order to move it and which has an opening, wherein a bolt connected to the movable part passes through the opening. The gear element can be another toothed element, such as a gear with teeth only over part of its circular arc. A torque is transmitted to this gear element, thus pivoting it. This pivoting movement is transferred to the movable part of the footboard via the bolt passing through the opening, thus executing the folding movement.

[0026] If excessive force is applied to the platform or the moving part, this can cause, for example, the transmission element to break. As described above, if a torque limit is exceeded, the torque limiter is activated, and no or only limited torque is transmitted. This prevents damage to the motor and transmission.

[0027] Preferably, the opening is designed such that the gear element can move within an angular range of 1° to 10°, more preferably from 3° to 5°, without transmitting any torque. Preferably, the opening is designed as an elongated hole with a circular arc-shaped contour. This means that the movable part of the footboard has a certain amount of play relative to the drive mechanism. During the folding movement, this causes the gear wheel and the gear element to move, but this movement is only transmitted to the movable part when the bolt comes into contact with one end of the elongated hole. This arrangement also ensures that in the event of minor impacts against the platform or the movable part in general, the resulting high torques are not directly transmitted to the gear and motor, thus protecting these components.

[0028] Furthermore, it is preferably provided that a head of the bolt is designed to break when a predetermined limit torque acts on the moving part. This is also a mechanism that ensures that gear components and / or motor are not damaged. In particular, this mechanism is provided as an additional safety device in case the torque limiter does not work, for example because the friction plates stick to the gear. The bolt has a predetermined breaking point that is designed to fail if too great a force is exerted on it. This is the case in the event of impacts or kicks against the platform or the moving part of the platform. If the head of the bolt breaks, there is no longer any connection between the gear element and the moving part and therefore no more torque transmission.In other words, if a torque limit is exceeded, the transmission assembly is decoupled, preventing the transmission components and the engine from being damaged by violent impacts or kicks. This mechanism also has the advantage that, in the event of damage, only the bolt needs to be replaced, which is significantly less time-consuming and costly than replacing individual transmission components or even the entire engine.

[0029] The invention also relates to a refuse collection vehicle with a running board as described above; here too, in order to avoid repetition, reference is made to the statements made up to this point.

[0030] The embodiment shown in the following figures and the associated description disclose further features of the invention. Fig. 1 a footboard according to the invention in perspective view, Fig. 2 the installation situation of the electric motor of the running board, Fig. 3 Electric motor and torque limiter in exploded view, Fig. 4 the torque limiter in assembled condition, Fig. 5 the torque limiter in sectional view, Fig. 6 the torque limiter in exploded view, Fig. 7 the support element, Fig. 8 the gear, Fig. 9 the printing plate, Fig. 10 a part of the moving part in exploded view, Fig. 11 an excerpt from Fig. 10.

[0031] The Fig. The running board 1 shown in Figure 1 comprises a holder 2, with which the running board 1 can be attached to a refuse collection vehicle, and a movable part 3 with a platform 4. Shown here, the movable part 3 is in a folded-out, open position. The platform 4 is arranged substantially parallel to a footprint of the vehicle so that it can be accessed by the operating personnel. When the platform 4 is not needed, for example, during a transfer trip to the site of use or to a waste disposal site, the movable part 3 can be moved into a folded-up, closed position. This folding process is accomplished by means of an electric motor 5 and a gear. These components are housed in an interior space 6 of the holder 2.

[0032] The assembly situation is shown in the exploded view in Fig. 2. A torque limiter 8 with a gear 9 is arranged on the drive shaft 7 of the electric motor 5 (not visible here). The electric motor 5 is secured in the interior 6 by means of a motor mount 10. The gear 9 is protected from contamination by a gear cover 11.

[0033] The exploded view in Fig. 3 shows the assembly of the electric motor 5 and the torque limiter 8. The torque limiter 8, described in more detail below, comprises a support element 12 with a hollow cylindrical part 13 into which the drive shaft 7 engages. A screw hole 15 is provided in the end face 14 of the support element 12, through which the drive shaft 7 is screwed to the support element 12 with a screw 16.

[0034] The torque limiter 8 is designed to prevent damage to the electric motor 5 and / or transmission components. Such damage may occur if the running board 1 is misused. Attempts may be made to accelerate the folding of the running board 1 by exerting pressure on the platform 4, or operators may jump onto the platform 4 before the folding process is complete, or the platform 4 may strike an obstacle. Excessive torque may then act on the transmission components, and the resulting forces may cause damage to the transmission, such as breakage of the gearwheel 9 and / or the electric motor 5. The torque limiter 8 is designed such that, once a predetermined torque limit is reached, no more torque is transmitted by the torque limiter 8.

[0035] Fig. 4 shows the torque limiter 8 in assembled condition, Fig. 5 shows a sectional view and in Fig. 6 shows the components of the torque limiter 8 in an exploded view.

[0036] The torque limiter 8 has a carrier element 12 with a disc-shaped part 17 and a hollow cylindrical part 13 projecting therefrom, wherein the hollow cylindrical part 13 (see also Fig. 7) as described, is penetrated by a drive shaft 7 of the electric motor 5 and is rotationally connected to it. The gear 9 is arranged on the hollow cylindrical part 13 and interacts with other gear components to transmit the torque to the movable part 3.

[0037] The gear 9 (see also Fig. 8) comes into full contact with a first friction plate 19 and a second friction plate 20 with its side surfaces 18a, 18b. The gear 9 has a recess 21a, 21b in each of its side surfaces 18a, 18b, which extends radially from the mounting opening 22 almost to the toothing 23. The friction plates 19, 20 are inserted into these recesses 21a, 21b. This centers the friction plates 19, 20, so that correct contact with the gear 9 is always ensured. In addition, the depth of the recesses 21a, 21b is adapted to the thickness of the friction plates 19, 20 in an unworn state. The friction plates 19, 20 therefore do not protrude beyond the side surfaces 18a, 18b, which reduces the required installation space in the axial direction ( Fig. 5).

[0038] The first friction plate 19 comes into contact with the disc-shaped part 17 of the carrier element 12. In the sectional view in Fig. 5 it can be seen that the first friction plate 19 and the disc-shaped part 17 have the same dimensions.

[0039] The second friction plate 20 comes into full contact with a pressure plate 24, which is also arranged on the hollow cylindrical part 13. The pressure plate 24 (see also Fig. 9) has a through-opening 25 with two projections 26, 27. These projections 26, 27 engage in corresponding grooves 28, 29 of the hollow cylindrical part 13. These grooves 28, 29 extend from the end face 14 toward the disc-shaped part 17 and are diametrically opposite each other. The positive engagement thus created ensures the transmission of the torque generated by the electric motor 5. The second friction plate 20 and the pressure plate 24 also have the same dimensions.

[0040] After the pressure plate 24, a disc spring 30, a toothed washer 31, and a nut 32 are arranged on the hollow cylindrical part 13. A thread 33 is provided for the nut 32 at the free end of the hollow cylindrical part 13.

[0041] The nut 32 is screwed onto the hollow cylindrical part 13, thereby tensioning the disc spring 30, so that a force acts in the direction of the disc-shaped part 17. The magnitude of this contact force depends on how far the nut 32 is screwed onto the thread 33. A frictional connection is created between the friction plates 19, 20 and the gear 9, the strength of which, and thus the limiting friction force, depends on the contact force. If a torque is exerted on the gear 9 because the movable part 3 is pressed or pushed by the operator, this results in a force that counteracts the frictional force between the gear 9 and the friction plates 19, 20. If the torque exceeds a certain value, the static friction changes into sliding friction, and the gear 9 slides over the friction plates 19, 20. This means that at this point no or only a limited torque is transmitted between the gear 9 and the electric motor 5.Therefore, no opposing, excessive forces act on gear 9, and it can no longer be damaged. The electric motor 5 is also protected from damage.

[0042] The limit torque at which the frictional engagement between gear 9 and friction plates 19, 20 is overcome depends, as explained, on the contact pressure acting on the friction plates 19, 20. The contact pressure can be adjusted by the nut 32. The limit torque depends on the specific design of the footboard 1 and can be determined through testing. During assembly, the limit torque is adjusted by tightening the nut 32. The position of the nut 32 is then secured by the toothed washer 31.

[0043] A plain bearing 34 is arranged between the gear 9 and the friction plates 19, 20, and the carrier element 12. The plain bearing 34 is made of plastic. It serves to ensure the rotatability of the gear 9 and the friction plates 19, 20 relative to the carrier element 9 or its hollow cylindrical part 13. In this embodiment, the friction plates 19, 20 are in direct contact with the plain bearing 34. In other embodiments, for example, with a different design of the recess 21a, 21b, this may not be the case.

[0044] The axial dimension of the plain bearing 34 is smaller than the thickness D of the gear 9. There is a gap 35, 36 between the plain bearing 34 and the disc-shaped part 17 as well as the pressure plate 24. During operation, the friction plates 19, 20 wear out and become thinner. The disc-shaped part 17 and the pressure plate 24 must therefore move towards the gear 9 in order to continue to press the friction plates 19, 20 against the gear 9 with the necessary force. If the plain bearing 34 were axially as long as the gear 9 was wide, the disc-shaped part 17 and the pressure plate 24 would abut against the plain bearing 34 and would no longer be able to exert any pressure on the friction plates 19, 20. Over time, the gaps 35, 26 become smaller until at some point the disc-shaped part 17 and the pressure plate 24 abut against the plain bearing 34. Then the torque limiter 8 is no longer operational and must be serviced and the friction plates 19,20 can be replaced in good time.

[0045] The gear 9 is toothed with a gear element 37, which is connected to the movable part 3 of the footboard 1 in order to move it ( Fig. 10 and Fig. 11). The connection is indirect, as the gear element has an opening 38 through which a bolt 39 passes. The bolt 39 can be a screw, for example. A washer 41 is provided between the gear part 37 and the movable part 3. Bearing bushings 42, 43 are provided to ensure the rotatability of the movable part 3 relative to a shaft (not shown here).

[0046] The bolt 39 is fixedly arranged on the movable part 3 in a bolt receptacle 40. When the gear element 37 is moved by the gearwheel 9, it takes the bolt 39 with it and thus transfers the movement to the movable part 3. The opening 38 is designed as a circular-arc-shaped elongated hole in which the bolt 39 can slide. This means that the gear element 37 moves freely by a few degrees without transferring the movement until the end of the elongated hole comes into contact with the bolt 39, and the torque is thereby transferred. The gear element 37 is freely movable within an angular range of 3° to 5°. Conversely, small deflections of the movable part 3 from its current position cannot transfer any torque to the gear, since the bolt 39 then moves freely in the opening 38. This is a further protective mechanism to protect the gear and motor from damage.

[0047] Furthermore, the bolt 39 is designed so that its head breaks if excessive torque is applied to the movable part 3. The bolt 39 is then pressed against the edge of the opening 38 with such great force that the bolt 39 fails and breaks as intended. The running board 1 is then no longer functional, but can be repaired with manageable effort. Reference symbol 1 running board 2 holders 3 moving part 4 Platform 5 Electric motor 6 interior of 2 7 drive shaft of 5 8 torque limiters 9 gear 10 Engine mount 11 Gear cover 12 support element 13 hollow cylindrical part of 12 14 front of 13 15 screw holes 16 Screw 17 disc-shaped part of 12 18a first side surface of 9 18b second side surface of 9 19 first friction plate 20 second friction plate 21a first recess of 9 21b second recess of 9 22 Mounting opening 23 Gearing 24 printing plate 25 access opening of 24 26 lead 27 lead 28 grooves 29 grooves 30 disc spring 31 Toothed washer 32 mother 33 threads 34 plain bearings 35 gap 36 gap 37 Gear element 38 Breakthrough 39 bolts 40 bolt holder 41 Washer 42 bearing bush 43 Bearing bush D thickness of 9

Claims

[1] Torque limiter (8), with a carrier element (12) having a disc-shaped part (17) and a hollow cylindrical part (13) projecting therefrom, wherein the hollow cylindrical part (13) can be penetrated by a drive shaft (7) of a motor (5) and can be connected thereto and at least one gear wheel (9) and at least one friction plate (19, 20) are arranged on the hollow cylindrical part (13), wherein the at least one gear wheel (9) and the at least one friction plate (19, 20) are in frictional contact. [2] Torque limiter (8) according to claim 1 characterized by that the at least one gear (9) is in contact with the at least one friction plate (19, 20) under a predetermined contact force, wherein the contact force is selected such that the frictional engagement can be overcome when a predetermined limit torque acting on the gear (9) is exceeded. [3] Torque limiter (8) according to claim 1 or 2 characterized bythat the hollow cylindrical part (13) is screwed to the drive shaft (7) at the front. [4] Torque limiter (8) according to at least one of the preceding claims characterized by that the gear (9) has a recess (21a, 21b) on at least one side surface (18a, 18b) in which the at least one friction plate (19, 20) is arranged. [5] Torque limiter (8) according to at least one of the preceding claims characterized by that a friction plate (19,20) is arranged on each of the two side surfaces (18a, 18b) of the gear wheel (9). [6] Torque limiter (8) according to at least one of the preceding claims characterized by that a first friction plate (19) is in contact with the disc-shaped part (17) of the carrier element (12). [7] Torque limiter (8) according to at least one of the preceding claims characterized by that a second friction plate (20) comes into contact with a pressure plate (24) arranged on the hollow cylindrical part (13). [8] Torque limiter (8) according to at least one of the preceding claims characterized by that a plain bearing (34) is arranged between the gear (9) and the friction plates (19,20) and the carrier element (12). [9] Torque limiter (8) according to claim 8 characterized by that the dimension of the plain bearing (34) in its axial direction is smaller than the thickness D of the gear (9). [10] Torque limiter (8) according to at least one of the preceding claims characterized by that the hollow cylindrical part (13) has at least one groove (28,29) extending from the end face (14), preferably two opposing grooves (28,29) extending from the end face. [11] Torque limiter (8) according to claim 10 characterized bythat the pressure plate (24) has a through-opening (25) with at least one projection (26, 27) which engages in the corresponding groove (28, 29) of the hollow cylindrical part (13) when the pressure plate (24) is arranged on the hollow cylindrical part (13), preferably the pressure plate (24) has a through-opening (25) with two opposing projections (26, 27) which engage in the corresponding grooves (28, 29) of the hollow cylindrical part (13) when the pressure plate (24) is arranged. [12] Torque limiter (8) according to at least one of the preceding claims characterized by that at least one disc spring (30) is arranged on the hollow cylindrical part (13), which generates a pressing force under prestress in the assembled state. [13] Torque limiter (8) according to claim 12 characterized by that the at least one disc spring (30) is in contact with the pressure plate (24). [14] Torque limiter (8) according to at least one of the preceding claims characterized by that a nut (32) is arranged at the end of the hollow cylindrical part (13). [15] Running board (1), in particular for a refuse collection vehicle, with a holder (2) and a movable part (3) with a platform (4) and a drive unit with a motor (5) and a gear, which is designed to move the movable part (3) from a closed to an open position and back, with a torque limiter (8) according to at least one of the preceding claims. [16] Footboard (1) according to claim 15 characterized by that the gear wheel (9) of the torque limiter (8) is toothed with a gear element (37) which is connected to the movable part (3) in order to move the latter and which has an opening (38), wherein a bolt (39) connected to the movable part (3) passes through the opening (38). [17] Running board (1) according to claim 16 characterized bythat the opening (38) is designed such that the gear element (37) is movable in an angular range of 1° to 10°, preferably from 3° to 5°, without transmitting a torque, preferably the opening (38) is designed as an elongated hole with a circular arc-shaped contour. [18] Footboard (1) according to claim 16 or 17 characterized by that a head of the bolt (39) is designed to break when a predetermined limit torque acts on the movable part (3). [19] Refuse collection vehicle with a running board (1) according to at least one of claims 15 to 18.

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