Door system and retractable step access system of a vehicle with an energy chain

Abstract

The invention relates to a door system (19) of a vehicle, comprising a door portal (20) and a door (21) movable relative to the door portal (20), wherein an energy chain (1) is attached at a first attachment region (22) on the door portal (20) and at a second attachment region (23) on the at least one door (21). According to the invention, the energy chain (1) is reinforced by at least one resiliently elastic reinforcement element (12) and has a number of chain elements (3) which are interconnected in an articulated manner by joint connections (2) and which each have two parallel brackets (4, 5), transverse webs (6, 7) connecting the two brackets (4, 5), and an inner chamber (8) between the brackets (4, 5) and the transverse webs (6, 7), which together form an inner guide channel (10) for guiding an energy-carrying element (11).

Description

[0001] DESCRIPTION

[0002] Door system and sliding step entry system of a vehicle with an energy guide chain

[0003] The invention is based on a door system of a vehicle according to the preamble of claim 1 and on a sliding step entry system according to the preamble of claim 8.

[0004] For vehicles, generic door systems are known, e.g. from DE10343029A1, with a sliding door that can be moved between a closed position and an open position. The known sliding door system has a power guide chain, which is connected at one end to the sliding door and at one end to a body of the vehicle. The power guide chain can be equipped with a plurality of different lines, in particular with electrical lines, so that, for example, an electrical consumer arranged in the sliding door is connected to an electrical system of the vehicle via an electrical line guided in the power guide chain. The power guide chain has at least one curved region located between the ends, wherein the curved region has different radii of curvature depending on the position of the sliding door.When the cable guide chain moves in a horizontal plane, this is referred to as a horizontal arrangement. The problem with this horizontal arrangement is that the cable guide chain, along with the cables it carries, is subjected to bending stress due to its own weight, which adversely affects the wear of the cable guide chain's link joints.

[0005] The invention is based on the object of providing a door system and a sliding step entry system of a vehicle, each with an energy chain, which on the one hand is designed as simply as possible and on the other hand has a long service life.

[0006] This object is achieved by the features of claims 1 and 8. Disclosure of the invention

[0007] In a first aspect, the invention provides a door system of a vehicle, in particular of a rail vehicle, comprising a door portal and at least one door movable relative to the door portal, wherein an energy guiding chain is connected to a first connection area on the door portal and to a second connection area on the at least one door, wherein a) the energy guiding chain is reinforced by at least one spring-elastic reinforcing element, and b) viewed in the longitudinal direction of the energy guiding chain, has a number of chain links articulated to one another by articulated connections, each of which has two parallel plates, in particular exactly two transverse webs connecting the two plates, and an inner chamber between the plates and the transverse webs, wherein b) the inner chambers of the number of chain links arranged next to one another, viewed in the longitudinal direction of the energy guiding chain, form an inner guide channel,within which at least one energy-conducting element is guided, and wherein c) the resilient reinforcement element is designed in the shape of a band and, in addition to two surfaces facing away from one another, has two side surfaces, and wherein d) the energy guide chain reinforced by the at least one resilient reinforcement element can assume differently bent states in a working plane, within which the energy guide chain can be bent as intended during operation, in which at least some chain links are each twisted relative to one another around the articulated connections, and wherein e) the reinforcement element prestresses the energy guide chain in the working plane, at least in some regions, into its unbent or straight state, and wherein f) in at least some of the chain links of the number of chain links, the at least one resilient reinforcement element is each within the inner chamber,is arranged in a space between an outer circumference of the at least one energy-conducting element and an inner surface of a transverse web of the two transverse webs, and that g) the resilient reinforcement element is designed such that, in the at least some chain links of the number of chain links, it contacts one link of the two link plates with one side surface of the two side surfaces and the other link of the two link plates with the other side surface of the two side surfaces, whereby the at least one resilient reinforcement element stiffens the energy guide chain transversely to the working plane.

[0008] In a further aspect, the invention provides a sliding step entry system for a vehicle, in particular a rail vehicle, comprising a base fixed to the vehicle and a sliding step that can be extended and retracted relative to the base, wherein an energy guide chain is connected to a first connection area on the base and to a second connection area on the sliding step, wherein a) the energy guide chain is reinforced by at least one spring-elastic reinforcing element, and b) viewed in the longitudinal direction of the energy guide chain, a number of chain links that are articulated to one another by articulated connections, each of which has two parallel plates, in particular exactly two transverse webs connecting the two plates, and an inner chamber between the plates and the transverse webs,wherein b) the inner chambers of the number of chain links, viewed in the longitudinal direction of the energy guide chain, form an inner guide channel within which at least one energy-carrying element is guided, and wherein c) the resilient reinforcing element is designed in a band-like manner and has two side surfaces in addition to two surfaces facing away from one another, and wherein d) the energy guide chain reinforced by the at least one resilient reinforcing element can assume different bent states in a working plane, within which the energy guide chain can be bent as intended during operation, in which at least some chain links are each twisted relative to one another around the articulated connections, and wherein e) the reinforcing element prestresses the energy guide chain in the working plane, at least in some regions, into its unbent or straight state,and wherein f) in at least some of the chain links of the plurality of chain links, the at least one resilient reinforcement element is arranged within the inner chamber, in a space between an outer circumference of the at least one energy-conducting element and an inner surface of a transverse web of the two transverse webs, and that g) the resilient reinforcement element is designed such that, in at least some of the chain links of the plurality of chain links, it contacts one link of the two link plates with one side surface of the two side surfaces and the other link of the two link plates with the other side surface of the two side surfaces, whereby the at least one resilient reinforcement element stiffens the energy guide chain transversely to the working plane.

[0009] The energy guide chain can thereby assume any bent or curved state, at least in some areas, wherein the spring-elastic reinforcing element prestresses the energy guide chain in a working plane, at least in some areas, in particular in its non-bent or straight state.

[0010] An energy-carrying element is understood to mean any element, such as an electrical, pneumatic, or hydraulic line, that carries an energy-carrying medium, in particular an electrical, pneumatic, or hydraulic current. However, an energy-carrying element is also understood to mean a data line, such as a signal line, a data bus, or a fiber optic cable, which carries electrical analog or digital signals as energy.

[0011] The fact that the spring-elastic reinforcing element is designed in the shape of a band and has two side surfaces in addition to two surfaces facing away from each other means that the two side surfaces each run along the thickness of the band which represents the spring-elastic reinforcing element, and the two surfaces facing away from each other run along the longitudinal direction of this band.

[0012] Because the at least one resilient reinforcement element is arranged within the inner chamber, namely in a space between an outer periphery of the at least one energy-conducting element and an inner surface of a crosspiece of the two crosspieces, no additional retaining elements are required for the resilient reinforcement element. Rather, the at least one resilient reinforcement element is held or fixed in the space. This eliminates the effort required to mount the at least one resilient reinforcement element on the energy chain.In particular, commercially available energy guiding chains, which have only or exactly two crosspieces and only or in particular exactly two plates per chain link, do not need to be modified to hold the at least one resilient reinforcement element because the inner guide channel, which guides the at least one energy-conducting element, simultaneously also guides or houses the at least one resilient reinforcement element. Furthermore, the at least one resilient reinforcement element can thereby be guided at least in places between the outer circumference of the at least one energy-conducting element and a respective crosspiece of a chain link in a type of clamping, which can be dependent in particular on the prevailing radius of curvature of the energy guiding chain at that location.As a result, the energy guide chain is stiffened or reinforced by the at least one spring-elastic reinforcing element, in particular in the working plane, within which the energy guide chain can be guided or bent as intended during operation.

[0013] Preferably, for at least one chain link of the plurality of chain links, a first transverse web protrudes perpendicularly from a first edge of a first (one) plate and an opposite first edge of a second (other) plate parallel to the first plate, and a second transverse web protrudes perpendicularly from a second edge of the first (one) plate and an opposite second edge of the second (other) plate in order to connect the two opposite edges of the two, in particular parallel, plates to one another. The first edge and the second edge of the two plates, in particular, each point away from one another.

[0014] In addition, the at least one spring-elastic reinforcing element is designed such that, in at least some of the chain links of the number of chain links, it contacts one link of the two link plates with one side surface of the two side surfaces and the other link of the two link plates with the other side surface of the side surfaces, in particular such that the contact between the side surfaces and the link plates still allows relative rotation of the chain links about the joint axes without excessive resistance. As a result, the at least one spring-elastic reinforcing element stiffens the energy guide chain, in particular transversely to the aforementioned working plane or transversely to its longitudinal extent, whereby sagging, in particular of horizontally arranged energy guide chains, can be prevented. The joint connections of the chain links are advantageously relieved of stress.On the other hand, additional horizontal guide or support plates are no longer necessary, on which the energy chain rests vertically to prevent sagging. Such guide or support plates disadvantageously separate a box in the door portal of the door system of, for example, a rail vehicle, in which the door drive and control system are also located, horizontally and represent an obstacle for vertically installed cables.

[0015] The above-mentioned measures according to the invention therefore lead to reduced wear and thus to an extension of the service life of commercially available energy chains without the need for modifications, particularly with regard to the number of crosspieces and link plates of the chain links. The longest possible trouble-free operation of the energy chain is particularly advantageous when used in door systems of rail vehicles, particularly those intended for passenger transport, for boarding and disembarking passengers. Advantageous further developments of the invention are possible in the subclaims.

[0016] Preferably, the spring-elastic reinforcing element is designed such that, viewed in the longitudinal direction of the energy guiding chain, at least within one chain link a) contact is present or occurs or can occur between a surface of the spring-elastic reinforcing element and an inner surface of a crosspiece, and / or b) contact is present or occurs or can occur between the other surface of the spring-elastic reinforcing element and the outer circumference of the energy-conducting element.

[0017] Through the contact or contacts, a force can be transmitted from the spring-elastic reinforcing element to the at least one chain link or to the energy-carrying element, in particular a restoring force which has a straightening effect on curved areas of the energy guide chain.

[0018] Therefore, the spring-elastic reinforcement element can be designed such that, in its basic state—i.e., when separated from the energy chain and unloaded—it assumes or has a straight shape. When installed in the energy chain, its resilient elastic properties have a straightening effect on curved sections of the energy chain. This allows the energy chain to be reinforced or stiffened in the working plane.

[0019] If the intermediate space in which the at least one elastic reinforcing element is arranged is preferably spaced from a neutral fiber of the energy chain, this can result in reinforcement or stiffening of the energy chain that is tailored to the intended movement or bending of the energy chain, because a lever arm is then present between the neutral fiber and the at least one elastic reinforcing element. The neutral fiber preferably intersects the joint axes of the joint connections of the energy chain. Preferably, the spring-elastic reinforcing element, in at least some of the chain links of the number of chain links, contacts a transverse web of the two transverse webs with one surface of its two surfaces. Through this contact, the energy chain is stiffened, particularly in the working plane explained above.

[0020] If in at least one curved area of ​​the energy chain one of the two crossbars is a radially outer crossbar or a radially inner crossbar, then the transverse stiffening effect of the reinforcing element on the energy chain can be localized either radially outside or radially inside.

[0021] In the energy guide chain, the at least one resilient reinforcement element can comprise a strip of spring steel and / or a strip of a plastic, such as a fiber-reinforced plastic, and / or resilient wires arranged parallel to one another in the form of a strip. In the energy guide chain, the chain links are preferably made of a plastic.

[0022] The invention therefore relates to a door system of a vehicle, in particular a rail vehicle, comprising a door portal and at least one door movable relative to the door portal, for example a sliding door or a pivoting sliding door. According to the invention, an energy guide chain as described above is connected to a first connection area on the door portal and to a second connection area on the at least one door.

[0023] Furthermore, the invention also encompasses the sliding step entry system of a vehicle, in particular a rail vehicle, which has a vehicle-fixed, in particular box-like, base and a sliding step that can be retracted and extended with respect to the base, wherein an energy guide chain as described above is connected to a first connection area on the base and to a second connection area on the sliding step.

[0024] In the first and second connection areas, electrical connections for the at least one energy-carrying element are provided, so that electrical energy and / or electrical signals can be conducted between the two connections along the at least one energy-carrying element.

[0025] drawing

[0026] An embodiment of the invention is shown in the drawing below and explained in more detail in the following description. The drawing shows

[0027] Fig.1 is a perspective view of an energy guide chain in a preferred commercially available embodiment in a state in which some chain links are rotated relative to each other around the joint axes;

[0028] Fig.2 is a cross-sectional view of the energy chain of Fig. 1 along a longitudinal center plane;

[0029] Fig. 3 is a cross-sectional view of the energy guide chain of Fig. 1 along a longitudinal center plane, which has been stiffened by means of an integrated elastic reinforcing element according to a preferred embodiment;

[0030] Fig. 4 is a cross-sectional view of the energy guide chain of Fig. 3 stiffened by the integrated elastic reinforcement element along the line IV - IV of Fig. 3;

[0031] Fig. 5 is a cross-sectional view of the energy guide chain of Fig. 3 stiffened by the integrated elastic reinforcement element along the line V - V of Fig. 3;

[0032] Fig. 6 is an enlarged partial section of Fig. 5;

[0033] Fig. 7 is a schematic view of a door system of a rail vehicle with an energy chain according to Fig. 3 in a state in which a door of the door system is closed;

[0034] Fig. 8 is a schematic view of the door system of Fig. 7 in a state in which a door of the door system is open. Description of the embodiment

[0035] Fig. 1 shows a perspective view of a preferred commercially available energy guide chain 1. The energy guide chain 1 has, in its longitudinal direction, a number of chain links 3 which are articulated to one another by articulated connections 2, each of which has exactly or only two parallel plates, a first plate 4 and a second plate 5, and only or exactly two transverse webs connecting the two plates 4, 5, a first transverse web 6 and a second transverse web 7 (Fig. 4, Fig. 5). Between the two plates 4, 5 and the two transverse webs 6, 7, an inner chamber 8 (Fig. 5, Fig. 6) of the respective chain link 3 is formed for each chain link 3. The energy guide chain 1 is therefore designed so that it can be bent within a working plane 9 due to the degree of rotational freedom of the articulated connections 2 (Fig. 1).

[0036] As best illustrated in Fig. 4, the first transverse web 6 protrudes perpendicularly from a first edge of the first tab 4 and from an opposite first edge of the second tab 5, which is in particular parallel to the first tab 4, and the second transverse web 7 protrudes perpendicularly from a second edge of the first tab 4 and an opposite second edge of the second tab 5 in order to connect the two opposite edges of the two, in particular, parallel tabs 4, 5. The first edge and the second edge of the two tabs 4, 5 each point away from each other.

[0037] The inner chambers 8 of the chain links 3, which are arranged in a row as viewed in the longitudinal direction of the energy guide chain 1, then form an inner guide channel 10, within which at least one energy-carrying element (not shown in Fig. 1 and Fig. 2 but shown in Fig. 3 to Fig. 5) is guided, here in particular an electrical cable 11, which is designed to conduct electrical energy and / or analog or digital signals, which represent, for example, data. For this purpose, several electrical wires or lines can be combined in the electrical cable 11, for example.

[0038] A spring-elastic reinforcement element 12, shown in cross-section in Fig. 6, serves to reinforce or stiffen the energy chain 1 according to Fig. 1 and Fig. 2 and has the shape of a band. Therefore, in addition to two mutually facing and, in particular, parallel surfaces, a first surface 13 and a second surface 14, it has two, in particular, parallel side surfaces, a first side surface 15 and a second side surface 16.

[0039] Here, for example, in all chain links 3, the spring-elastic reinforcing element 12 is guided or arranged within their inner chambers 8, in each case in an intermediate space 17 between an outer circumference here of the electrical cable 11 and an inner surface, for example of the first transverse web 6 of the two transverse webs 6, 7, as shown in Fig. 3 to Fig. 6.

[0040] As can be seen in particular from Fig. 5 and Fig. 6, the spring-elastic reinforcing element 12 is designed such that, in the chain links 3, it contacts the inner surface of the first plate 4 with the first side surface 15 and the inner surface of the second plate 5 with the second side surface 16, in each case in such a way that the contact, which is preferably present in all chain links 3, between the side surfaces 15, 16 and the inner surfaces of the plates 4, 5 still allows relative rotation of the chain links 3 around the articulated connections 2. The contact can therefore cause a certain (minor) sliding or static friction between the side surfaces 15, 16 of the spring-elastic reinforcing element 12 and the inner surfaces of the plates 4, 5 of the chain links 3. However, this sliding or static friction is not so great that the intended curved or bent states of the energy chain 1 within the working plane 9 can no longer be caused.Such a partially bent state of the energy guide chain 1 including the reinforcing element 12 is shown by way of example in Fig. 3. Nor does this contact rule out the possibility that, due to tolerances, a slight play may occur between at least one side surface 15, 16 and at least one inner surface of a link plate 4, 5. What is important is that, when the energy guide chain 1 is used as intended, in particular in a bent region thereof, this contact occurs or can occur in at least some chain links 3. This contact can, for example, arise (even only) due to the weight of the energy guide chain 1 carrying the electrical cable 11 or be reinforced if the chain is installed in a horizontal arrangement, for example, as shown in Fig. 7 and Fig. 8.

[0041] Although not shown in Fig. 6 for reasons of clarity, viewed in the longitudinal direction of the energy guide chain 1, at least in places or regions, i.e. at least within one chain link 3, contact can be present or occur between the first surface 13 of the spring-elastic reinforcing element 12, which here points radially outwards, for example, and an inner surface of the first transverse web 6, which here points radially outwards, for example. Alternatively or additionally, contact can be present or occur at least within one chain link 3 between the second surface 14 of the spring-elastic reinforcing element 12, which here points radially inner, for example, and the outer circumference of the electrical cable 11. As a result of this contact or these contacts, a force can be generated between the spring-elastic reinforcing element 12 and the electrical cable 11 orbetween the spring-elastic reinforcing element 12 and the at least one chain link 3, which then prestresses a bent region of the energy guide chain 1 into a straight or unbent state. As a result, the energy guide chain 1 is reinforced or longitudinally stiffened, particularly in the working plane 9.

[0042] Because, as described above, the two side surfaces 15, 16 of the spring-elastic reinforcing element 12 additionally contact the inner surfaces of the two plates 4, 5 of the chain links 3 at least in at least one chain link 3, the spring-elastic reinforcing element 12 also has a transverse stiffening effect on the energy guide chain 1, ie in a direction perpendicular to the working plane 9.

[0043] The resilient reinforcement element 12 can comprise a strip of spring steel and / or a strip of a plastic, such as a fiber-reinforced plastic, and / or resilient wires arranged side by side in the form of a strip. The chain links 3 of the energy guide chain 1 also preferably consist of at least one plastic.

[0044] If, as best illustrated by Fig. 5 and Fig. 6, the spaces 17 of the chain links 3, in which the elastic reinforcing element 12 is arranged, are preferably arranged at a distance from a neutral fiber 18 of the energy guide chain 1, then a reinforcement or stiffening can be achieved which is adapted to a movement or bending of the energy guide chain 1 in the working plane 9, depending on whether the spaces 17 are located radially outside or radially inside with respect to the neutral fiber 18.

[0045] Fig. 7 shows a schematic view of a door system 19 of a vehicle, for example a rail vehicle, comprising a door portal 20 firmly connected to a car body and a door 21 which is movable relative to the door portal 20, here for example as a pivoting sliding door, wherein in the state of Fig. 7 the door 21 is closed. The energy guiding chain 1 is connected to a first connection area 22 on the door portal 20 and to a second connection area 23 on the movable door 21 in such a way that, for example, electrical energy and / or analog or digital signals can be guided between the two connection areas 22, 23 along the electrical cable 11 guided through the energy guiding chain 1. As can be seen, the energy guiding chain 1 is preferably used in a horizontal arrangement, wherein it is reinforced by the above-described spring-elastic reinforcement element 12 both in the working plane 9, which is here for example horizontal (in Fig.7 and Fig. 8 the plane of the drawing) and transversely thereto, ie here stiffened or reinforced in the vertical direction. When the door of Fig. 7 is closed, certain regions of the energy guiding chain 1 are curved and straight, just as certain regions are curved and straight when the door is open, as can be seen from Fig. 8. These straight or curved regions of the energy guiding chain 1 can change in terms of their curvature and direction of curvature depending on the state of the door (open - intermediate position - closed).

[0046] As can be easily understood from Fig. 7 and Fig. 8, when the door 21 is transferred from the closed state (Fig. 7) to the fully open state (Fig. 8), the second connection area 23 of the energy chain 1 moves past the first stationary connection area 22. As can be seen, the type of bend or curvature of areas of the energy chain 1 can also vary depending on the state of the door 21 (open - intermediate position - closed). It can happen that the area 24 of the energy guide chain 1 marked with the circle in Fig. 7 is bent in a direction directly opposite to that of the open door (Fig. 8) when the door is closed, for example in such a way that in this marked area 24, when the door is closed according to Fig. 7, radially outer transverse webs of the chain links 3 and the radially outer surface of the spring-elastic reinforcing element 12 are bent when the door is open according to Fig.8 are arranged radially inward.

[0047] Against the background of the embodiment of the energy guide chain 1 described above in Fig. 3, the spring-elastic reinforcing element 12 can then be arranged, for example, within the chain links 3 of the energy guide chain 1 in such a way that here, for example, in the marked area 24, the respective surface 13, 14 of the spring-elastic reinforcing element 12 and the transverse webs 6, 7 of the chain links 3, which delimit the intermediate spaces 17 in which the spring-elastic reinforcing element 12 is accommodated, are each arranged radially outward or radially inward, depending on whether the door 21 is in the closed or open state or in an intermediate position.

[0048] List of reference symbols

[0049] 1 energy chain

[0050] 2 joints

[0051] 3 chain links

[0052] 4 first tab

[0053] 5 second tab

[0054] 6 first crossbar

[0055] 7 second crossbar

[0056] 8 inner chamber

[0057] 9 Working level

[0058] 10 inner guide channel

[0059] 11 electrical cable

[0060] 12 spring-elastic reinforcement element

[0061] 13 first surface

[0062] 14 second surface

[0063] 15 first side surface

[0064] 16 second side surface

[0065] 17 space

[0066] 18 neutral fiber

[0067] 19 Door system

[0068] 20 door portal

[0069] 21 Door 22 first connection area

[0070] 23 second connection area

[0071] 24 marked area

Claims

PATENT CLAIMS 1. A door system (19) of a vehicle, in particular a rail vehicle, comprising a door portal (20) and at least one door (21) movable relative to the door portal (20), wherein an energy guiding chain (1) is connected to a first connection area (22) on the door portal (20) and to a second connection area (23) on the at least one door (21), characterized in that a) the energy guiding chain (1) is reinforced by at least one resilient reinforcing element (12), and b) viewed in the longitudinal direction of the energy guiding chain (1), it has a number of chain links (3) which are articulated to one another by articulated connections (2), each of which has two parallel plates (4, 5), in particular exactly two transverse webs (6, 7) connecting the two plates (4, 5), and an inner chamber (8) between the plates (4, 5) and the transverse webs (6, 7),wherein b) the inner chambers (8) of the number of chain links (3), which are arranged one after the other in the longitudinal direction of the energy guiding chain (1), form an inner guide channel (10) within which at least one energy-conducting element (11) is guided, and wherein c) the resilient reinforcing element (12) is designed in the shape of a band and, in addition to two surfaces (13, 14) facing away from one another, has two side surfaces (15, 16), and wherein d) the energy guiding chain (1) reinforced by the at least one resilient reinforcing element (12) can assume different bent states in a working plane, within which the energy guiding chain can be bent as intended during operation, in which at least some chain links (3) are each rotated relative to one another around the articulated connections (2),and wherein e) the reinforcing element (12) prestresses the energy guide chain in the working plane at least in some areas into its non-bent or straight state, and wherein, f) in at least some of the chain links (3) of the number of chain links (3), the at least one resilient reinforcement element (12) is arranged within the inner chamber (8), in a space (17) between an outer circumference of the at least one energy-conducting element (11) and an inner surface of a crosspiece (6 or 7) of the crosspieces (6, 7), and that g) the resilient reinforcement element (12) is designed such that in the at least some chain links (3) of the number of chain links (3), it contacts one plate (4) of the two plates (4, 5) with one side surface (15) of the two side surfaces (15, 16) and the other plate (5) of the two plates (4, 5) with the other side surface (16) of the two side surfaces (15, 16), such that the at least one resilient reinforcement element (12) reinforces the energy guiding chain (1) stiffened transversely to the working plane.

2. Door system (19) according to claim 1, characterized in that in at least some chain links (3) the spring-elastic reinforcing element (12) of the number of chain links (3) contacts with one surface (13 or 14) of its two surfaces (13, 14) one transverse web (6 or 7) of the two transverse webs (6, 7).

3. Door system (19) according to claim 2, characterized in that in at least one curved region (24) of the energy guide chain (1), one of the two crossbars (6, 7) is a radially outer crossbar or a radially inner crossbar.

4. Door system (19) according to one of the preceding claims, characterized in that the at least one resilient reinforcing element (12) is designed such that, viewed in the longitudinal direction of the energy guide chain (1), at least within one chain link (3) a) contact is present or occurs between a surface (13, 14) of the at least one spring-elastic reinforcing element (12) and an inner surface of a transverse web (6, 7), and / or b) contact is present or occurs between the other surface (13, 14) of the at least one spring-elastic reinforcing element (12) and the outer circumference of the energy-conducting element (11).

5. Door system (19) according to one of the preceding claims, characterized in that the intermediate space (17) in which the at least one spring-elastic reinforcing element (12) is arranged is spaced from a neutral fiber (18) of the energy guide chain (1).

6. Door system (19) according to one of the preceding claims, characterized in that the at least one spring-elastic reinforcing element (12) comprises a band made of spring steel and / or a band made of a plastic and / or spring-elastic wires arranged parallel to one another in the form of a band.

7. Door system (19) according to one of the preceding claims, characterized in that at least some chain links (3) of the number of chain links (3) consist of a plastic.

8. Sliding step entry system of a vehicle, in particular a rail vehicle, comprising a vehicle-fixed base and a sliding step that can be retracted and extended with respect to the base, wherein an energy guide chain (1) is connected to a first connection area on the base and to a second connection area on the sliding step, characterized in that a) the energy guiding chain (1) is reinforced by at least one resilient reinforcing element (12), wherein b) viewed in the longitudinal direction of the energy guiding chain (1), the chain has a number of chain links (3) which are articulated to one another by articulated connections (2), each of which has two parallel plates (4, 5), in particular exactly two transverse webs (6, 7) connecting the two plates (4, 5), and an inner chamber (8) between the plates (4, 5) and the transverse webs (6, 7), and wherein b) the inner chambers (8) of the number of chain links (3), which are arranged one after the other, viewed in the longitudinal direction of the energy guiding chain (1), form an inner guide channel (10), within which at least one energy-conducting element (11) is guided, and wherein c) the resilient reinforcing element (12) is designed in the shape of a band and, in addition to two surfaces (13, 14) facing away from one another, has two side surfaces (15, 16),and wherein d) the energy guide chain (1) reinforced by the at least one resilient reinforcing element (12) can assume differently bent states in a working plane within which the energy guide chain can be bent as intended during operation, in which at least some chain links (3) are each twisted relative to one another around the articulated connections (2), and wherein e) the reinforcing element (12) prestresses the energy guide chain in the working plane, at least in some regions, into its unbent or straight state, and wherein f) in at least some of the chain links (3) of the number of chain links (3), the at least one resilient reinforcing element (12) is arranged within the inner chamber (8), in an intermediate space (17) between an outer circumference of the at least one energy-conducting element (11) and an inner surface of a transverse web (6 or 7) of the two transverse webs (6, 7),and that g) the resilient reinforcing element (12) is designed such that it is provided in the at least some chain links (3) of the number of chain links (3) with a, Side surface (15) of the two side surfaces (15, 16) contacts one tab (4) of the two tabs (4, 5) and with the other side surface (16) of the two side surfaces (15, 16) contacts the other tab (5) of the two tabs (4, 5), such that the at least one spring-elastic reinforcing element (12) stiffens the energy guide chain (1) transversely to the working plane.

9. Sliding step entry system according to claim 8, characterized in that in at least some chain links (3) the spring-elastic reinforcing element (12) of the number of chain links (3) contacts with one surface (13 or 14) of its two surfaces (13, 14) one crosspiece (6 or ?) of the two crosspieces (6, 7).

10. Sliding step entry system according to claim 9, characterized in that in at least one curved region (24) of the energy guide chain (1), one of the two crossbars (6, 7) is a radially outer crossbar or a radially inner crossbar.

11. Sliding step entry system according to one of claims 8 to 10, characterized in that the at least one spring-elastic reinforcing element (12) is designed such that, viewed in the longitudinal direction of the energy guide chain (1), at least within one chain link (3) a) contact is present or occurs between a surface (13, 14) of the at least one spring-elastic reinforcing element (12) and an inner surface of a crosspiece (6, 7), and / or b) contact is present or occurs between the other surface (13, 14) of the at least one spring-elastic reinforcing element (12) and the outer circumference of the energy-conducting element (11).

12. Sliding step entry system according to one of claims 8 to 11, characterized characterized in that the intermediate space (17) in which the at least one spring-elastic reinforcing element (12) is arranged is spaced from a neutral fiber (18) of the energy guide chain (1).

13. Sliding step entry system according to one of claims 8 to 12, characterized in that the at least one spring-elastic reinforcing element (12) comprises a band made of spring steel and / or a band made of a plastic and / or spring-elastic wires arranged parallel to one another in the form of a band.

14. Sliding step entry system according to one of claims 8 to 13, characterized in that at least some chain links (3) of the number of chain links (3) consist of a plastic.

15. Sliding step entry system according to one of claims 8 to 13 or door system according to one of claims 1 to 7, characterized in that a) the first transverse web (6) projects vertically from a first edge of the first tab (4) and from an opposite first edge of the second tab (5), and b) the second transverse web (7) projects vertically from a second edge of the first tab (4) and an opposite second edge of the second tab (5) in order to connect the two opposite edges of the two tabs (4, 5) to one another, wherein c) the first edges and the second edges of the two tabs (4, 5) each point away from one another.

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