Vibration damper, and overhead line system comprising vibration damper

Abstract

The invention relates to a vibration damper (10), (50) for connecting to an overhead line system and to an overhead line system comprising at least one vibration damper (10), (50). The vibration damper (10), (50) is connected at least indirectly to at least one contact wire (2) and / or at least one support cable (3) of the overhead line system, and the vibration damper (10), (50) has a guide device (12), at least two parts (14), (16), namely a first (14) and a second (16) part which can be moved relative to each other along the guide device (12), and at least one damping component (18).

Description

[0001] Description

[0002] Vibration absorber and overhead line system with vibration absorber

[0003] The invention relates to a vibration damper and an overhead line system with at least one vibration damper.

[0004] Overhead lines, in particular contact lines of overhead line systems which supply power to at least partially electrically powered vehicles, both rail-bound and non-rail-bound, are excited to vibrate when a pantograph passes over them. This has a repercussion on the interaction between the overhead line and the pantograph. In particular when several pantographs follow one another at short intervals or in rapid succession, for example in rail vehicles with several pantographs or in corresponding non-rail-bound vehicles on overhead lines which supply road vehicles, and therefore in particular in eHighway overhead line systems, for example for electric trucks or electric buses, etc., the contact behavior between the pantograph and the overhead line deteriorates, sometimes seriously.The vibrations lead to a considerable increase in contact force fluctuations with corresponding negative effects on the operation and service life of the individual components.

[0005] To reduce these negative effects, vibration dampers, also known as vibration absorbers, are commonly used. The natural frequency of the vibration absorber used is typically tuned to the resonance frequency of the vibrating object to be eliminated, since the object in question then only performs minor movements at this frequency. Such vibration absorbers are typically used in the overhead line system, improving the properties of the overhead line system to such an extent that the required contact quality can be maintained even at comparatively higher travel speeds and with multiple pantographs.

[0006] For example, DE 20 2006 020 448 U1 discloses the use of vibration dampers to reduce the vibrations of a contact wire. These vibration dampers can only be used in areas of the contact wire not covered by a pantograph, i.e., in the area of ​​the overhead wire's guy wires.

[0007] EP 2 974 904 A1 describes that the use of damper elements in the overhead line system improves the contact quality with the contact line of the overhead line system, even at higher travel speeds and with several pantographs.

[0008] Despite the solutions used to date, in particular the vibration absorbers commonly used, it is currently still necessary to further reduce the vibrations that occur in certain sections, particularly in multi-pantograph operation, due to the enormous impact this has on the operation of the respective system. To do this, more complex and therefore much more costly overhead line or contact line systems are generally installed, which can absorb higher tensile forces and / or have smaller longitudinal spans, etc. Furthermore, the permissible (maximum) speed is restricted in certain sections, if necessary additionally, which in turn increases travel times accordingly.

[0009] The invention is based on the object of providing an improved vibration damper with which the vibrations generated in an overhead line system can be further reduced. This object is achieved by the features of independent patent claim 1. Further developments and refinements of the invention can be found in the features of the dependent patent claims.

[0010] For this purpose, a vibration damper for connection to an overhead line system is specified, which is connected at least indirectly to at least one contact wire and / or at least one supporting cable of the overhead line system, wherein the vibration damper has a guide device, at least two parts, a first and a second part, which can be displaced relative to one another along the guide device and at least one damping component.

[0011] The vibration damper according to the invention has the advantage that vibrations of an overhead line system, for example of contact wires, suspension cables, etc. connected to the vibration damper, can be absorbed and reduced or completely eliminated by a corresponding movement of the parts which can be moved relative to one another with the support of at least one damping component which the vibration damper according to the invention comprises. The damping component can, depending on requirements, be arranged at least inside one of the at least two parts which can be moved relative to one another or outside thereof. The vibration damper according to the invention can also comprise more than one damping component. The damping component in the sense of this invention is in particular a component, for example a spring, etc., by means of which the vibration energy of the vibrations which arise or have arisen in the corresponding overhead line orcontact line system can be transferred to the vibration absorber according to the invention at the frequency to be influenced and / or whose vibration amplitude can be reduced directly or indirectly.

[0012] Through the use of vibration dampers according to the invention, frequencies in the range of the fundamental vibration of the contact line system in question can be influenced, which have a particularly great influence on the generation of vibrations or the corresponding effects thereof, which can be proven in particular by investigations using dynamic simulation, and as a result of which the generation of the corresponding vibrations can be efficiently avoided or the vibrations that have occurred can be significantly reduced.

[0013] According to a preferred embodiment of the invention, the guide device is connected to the overhead line system in an articulated manner by means of at least one joint. Such an articulated connection of the guide device to a contact wire or a suspension cable of an overhead line system allows the vibration damper to automatically adapt to the corresponding position, particularly in the case of independent or different deflections of the contact wire and suspension cable, and its mode of operation is not restricted. This encompasses all options required depending on the requirements, local conditions, or requirements, and according to which the vibration damper can be designed and used accordingly:

[0014] - Only one articulated connection, with which the vibration absorber is connected by means of a joint either to the contact wire or to the suspension cable of the overhead line system;

[0015] - Two articulated connections with which the vibration absorber is connected to the contact wire and the suspension cable of the overhead line system by means of a joint each.

[0016] According to a further preferred embodiment of the invention, the guide device is connected at least at one end to the contact wire or to the suspension cable. The direct or fixed connection of the guide device either to the contact wire or to the suspension cable of an overhead line system ensures a correspondingly stable and secure connection between the vibration absorber and the overhead line system, with which the vibration absorber can also be very easily integrated or installed at a designated location in a chain system of the overhead line system. Depending on the request or the local conditions or requirements, this also includes the solution that the guide device of the vibration absorber is directly connected at both ends, both to the contact wire and to the suspension cable.

[0017] The invention also encompasses embodiments in which the guide device itself, and thus the vibration damper, has no connection to a suspension cable and / or a contact wire, but rather the guide device is guided by means of at least one separate guide, for example an eyelet, etc., wherein the separate guide, for example an eyelet, etc., can be arranged on the suspension cable or on the contact wire, wherein the separate guide does not transmit any force in the direction of vibration. An exact match between the guide device and the separate guide is not required. The possibility of two such separate guides, for example eyelets, etc., a first on the suspension cable and a second separate guide on the contact wire, is also encompassed by the invention. The invention also encompasses all possible other useful embodiments of a separate guide in different combinations.

[0018] According to a further particularly preferred embodiment of the invention, the vibration damper has at least one stop, by means of which the movement of the at least two parts which can be moved relative to one another along the guide device can be limited. In this way, the movement amplitude of the two displaceable parts is limited to a desired amount and thus uncontrolled deflection, in particular in the case of an opposite movement, is prevented, whereby damage to or destruction of the vibration damper is correspondingly prevented. The two displaceable parts are preferably designed in such a way that with maximum, opposite deflection of the two parts, i.e. the second part is deflected upwards in the direction of the supporting cable and the first part is deflected downwards in the direction of the contact wire, the stop is provided at the intersection point of the two parts which can be moved relative to one another.For this purpose, for example, the upper end of the first part and the lower end of the second part each have a correspondingly modified outer and inner diameter of the housings of the two parts, which are designed, for example, as sleeves. Thus, the respective total length of the two parts, which can be moved relative to each other, is available for the corresponding maximum possible deflection of the vibration absorber.

[0019] According to a further preferred embodiment of the invention, the guide device is designed as a guide rod. The guide rod is particularly preferably designed as a hollow profile. A design of the guide device as a guide rod, for example as a cylindrical rod, can be manufactured particularly easily and cost-effectively as a hollow profile, for example as a tube. To ensure particular stability, the guide rod can also be designed as a solid profile, depending on the existing circumstances or requirements.

[0020] According to another particularly preferred embodiment of the invention, the first and second parts of the at least two mutually displaceable parts can be inserted into one another, with at least one of the at least two mutually displaceable parts being directly connected to the guide device. Preferably, the at least two mutually displaceable parts are each designed as a hollow profile, for example, as sleeves that can be inserted into one another.

[0021] In this case, one end of the guide device is directly connected to one of the two parts which can be moved relative to one another, so that a guide is created by means of which the two components can be movably pushed into one another or pulled apart. Alternatively, the invention also encompasses embodiments in which at least one of the two parts which can be moved relative to one another, for example sleeves, is connected at least indirectly to the contact wire or suspension cable, for example by means of connecting elements which are arranged laterally on the housing of a sleeve. In these embodiments, no end of the guide device is directly connected to one of the at least two parts or sleeves which can be moved relative to one another. For this purpose, all sensible types of connection are possible, for example screw, adhesive or welded connections. In this way, the mutual orcounter - directional movement of the first and the second part of the vibration absorber is ensured in a simple and safe manner , since in particular the guide device prevents mutual tilting of the first and the second part of the vibration absorber .

[0022] According to a particularly preferred embodiment of the invention, the first part has a base plate and the second part has a cover, wherein the base plate and / or the cover has at least one opening for air inlet or outlet.

[0023] A corresponding connection to the contact wire can be implemented particularly easily by means of the base plate of the first part. In addition, a corresponding number of openings for air inlet and / or outlet in both the cover and the base, for example one or more, can contribute to damping the corresponding vibrations, particularly through the counter-rotating movement of the two parts. The degree of damping itself can be adapted or adjusted to suit requirements by adjusting the openings, for example number, size, shape, etc. Furthermore, depending on requirements, it is also possible to provide corresponding air inlet and / or outlet openings on the sides of the first and / or second part, alternatively or additionally.

[0024] According to a further preferred embodiment of the invention, the at least one damping component is connected at least at one end to one of the parts which can be displaced relative to one another.

[0025] According to a further particularly preferred embodiment of the invention, the at least one damping component is designed as a spring.

[0026] The spring is particularly preferably a spiral spring. The spring is preferably pre-tensioned when at rest. By means of the damping component, the vibration energy of the vibrations occurring or having occurred in the corresponding overhead line or contact line system can be transferred particularly effectively to the vibration absorber according to the invention at the frequency to be influenced and / or their vibration amplitude can be reduced directly or indirectly. A spring, in particular a spiral spring, as a cost-effective component that can be easily adapted to the respective requirements is particularly well suited for this purpose and is very readily available. The spring, in particular a spiral spring, which is arranged in this way inside and / or outside the two parts, designed for example as sleeves, which can be displaced relative to one another around the guide rod, is thus guided in or on the two sleeves.The damping component, such as the spring, can be connected to just one of the mutually movable parts or to both parts. Alternatively, the spring can also be connected to neither of the mutually movable parts and is thus arranged loosely around the guide rod within the two parts, without a direct connection. The preload ensures a corresponding automatic restoring force, which further enhances the corresponding properties of the damping component, such as the spring, etc.

[0027] According to a further preferred embodiment of the invention, the second part of the at least two parts which can be displaced relative to one another is designed to swing freely along the guide device.

[0028] According to a particularly preferred embodiment of the invention, the second part is at least partially weight-reinforcing and / or is designed with at least one discrete mass arranged on the second part.

[0029] Preferably, the at least one discrete mass is designed as a disc, ring or sleeve.

[0030] The arrangement which enables the second part, which is designed as a sleeve, for example, to oscillate freely further improves the corresponding properties of the vibration absorber described above. These properties of the vibration absorber according to the invention can be adapted or parameterised accordingly as desired or required, in particular on the basis of the respective local conditions, by changing, in particular increasing, the mass of the freely oscillating second sleeve. The second part or the second sleeve can be made weight-reinforced as a whole, for example with thicker walls, etc., or partially, for example just the cover. In particular, for example just the end of the second sleeve, which is designed as a stop, can be made weight-reinforced, for example as a disc, ring or sleeve.Alternatively or additionally, the end of the second sleeve can be reinforced with a discrete additional mass, for example, a reversible, removable, or replaceable one, for further parameterization of the damper mass. For example, the discrete additional mass can be arranged as a disc, ring, or sleeve at the end of the second sleeve, for example on the latter.

[0031] For sufficient effectiveness, the required total mass of the vibration absorber is on the order of several kilograms, depending on the size of the oscillating system under consideration.

[0032] According to another particularly preferred embodiment of the invention, the second part has a stabilizing sleeve and / or an additional guide along the guide device. This ensures further stabilization of the opposing movements of the two parts or sleeves.

[0033] According to a further preferred embodiment of the invention, the vibration damper has at least three parts which can be moved relative to one another along the guide device, the third part being arranged between the first and the second part. By means of further, additional parts, which are advantageously also designed as hollow profiles or sleeves, an increase in the maximum vibration amplitude in relation to the overall length of the vibration damper can be achieved, depending on requirements. The additional parts or sleeves simultaneously improve the stability of the damping component, for example the spiral spring, in particular when the vibration damper has a long overall length.

[0034] Particularly preferably, an overhead line system is equipped with at least one vibration damper according to one of claims 1 to 18.

[0035] Preferred embodiments of the invention are explained in more detail below with reference to the drawings. They show:

[0036] Fig. 1 shows a cross section of a first embodiment of the vibration damper according to the invention in the rest position,

[0037] Fig. 2 shows a cross section of a first embodiment of the vibration damper according to the invention in maximum deflection,

[0038] Fig. 3 shows a cross section of a second embodiment of the vibration damper according to the invention with telescopic extension in the rest position, and

[0039] Fig. 4 shows a cross section of a second embodiment of the vibration damper according to the invention with telescopic extension in maximum deflection.

[0040] In Figures 1 to 4, identical components are designated by the same reference numerals, even if the corresponding components may be designed differently. In this regard, Figures 1 and 2 describe a first embodiment 10 and Figures 3 and 4 describe a second embodiment 50 of the vibration damper according to the invention. Figure 1 shows a cross section of a first embodiment of the vibration damper 10 according to the invention in the rest position, consisting of a first part 14 and a second part 16, the first part 14 of the vibration damper 10 being inserted into the second part 16 of the vibration damper 10. The two parts 14, 16 which can be moved relative to one another are advantageously each designed as a hollow profile, here as sleeves which can be pushed into one another, and are arranged so as to be movable along a guide device 12 and can be pushed into one another and pulled apart from one another.

[0041] 1, the guide device 12 is designed as a guide rod, here as a cylindrical rod, with a solid profile to ensure particular stability. The guide rod 12 is connected at one end by means of a joint 26, at least indirectly to the supporting cable 3, and at the other end by means of a joint 24, at least indirectly to the contact wire 2 of an overhead line system. Due to the articulated connection of the guide rod 12 to the contact wire 2 and the supporting cable 3 of an overhead line system, the vibration damper 10 can automatically adapt to the corresponding position, in particular in the case of independent or different deflection of the contact wire 2 and the supporting cable 3, and its mode of operation is not restricted. Depending on requirements or the local conditions orDepending on the requirements, the guide rod 12 and thus the vibration damper 10 (not shown here) can also be connected with just one articulated connection, either to the contact wire 2 or to the supporting cable 3 of the overhead line system. The other end of the guide rod 12 is then connected directly, without a joint, to the contact wire 2 or to the supporting cable 3 of the overhead line system, or else entirely without a joint, directly to the contact wire 2 and the supporting cable 3 of the overhead line system, so that in every case a correspondingly stable and safe connection between the vibration damper 10 and the overhead line system is guaranteed. The respective at least indirect connections to the contact wire 2 or supporting cable 3 can be made via conventional clamp connections. In this way, the vibration damper 10 can also be very easily integrated or installed at a designated location in a chain system of the overhead line system in question.

[0042] The first part or the first sleeve 14 is directly connected to the end of the guide rod 12, which is also connected to the contact wire 2 by means of a joint 24. For this purpose, the first sleeve 14 has a base plate 30, to which the guide rod 12 and joint 24 are connected, thus at least indirectly, to the contact wire 3. All suitable connection types, such as screw, adhesive, or welded connections, are possible.

[0043] The second sleeve 16 accordingly has a cover 32 through which the guide rod 12 is passed essentially centrally through a corresponding opening in the cover 32 and the sleeve 16 can move or slide accordingly along the guide rod 12.

[0044] The two sleeves 14 and 16, which can be moved relative to one another, are connected or coupled to one another by means of a damping component 18, which is designed here as a coil spring with a preload and is located inside the two sleeves 14, 16. One end of the coil spring 18 is fastened to the cover 32 of the second sleeve 16 and the other end of the coil spring 18 is fastened to the base plate 30 of the first sleeve 14 and is thus arranged or guided in the sleeves 14, 16 around the guide rod 12. Not shown here, it is alternatively also possible without restriction to arrange the coil spring 18 only around the guide rod 12 and without any connection to the two sleeves 14, 16 within the sleeves 14, 16. The second sleeve 16 can oscillate essentially freely along the guide rod 12 independently of this and thus the oscillation energy of the resulting or.Vibrations generated in the overhead line system in question, for example from contact wires 2, suspension cables 3, etc. connected to the vibration absorber 10, are transmitted particularly effectively at the frequency to be influenced to the vibration absorber according to the invention by a corresponding movement of the sleeves 14, 16 which can be moved relative to one another, and / or their vibration amplitude is damped directly or indirectly, and accordingly corresponding vibrations in the overhead line system can be avoided or significantly reduced. The pre-tensioning also ensures a corresponding automatic restoring force which further enhances the corresponding properties of the vibration absorber 10 as a whole.

[0045] An adjustment of the parameters of the vibration absorber 10, for example the spring stiffness, mass, damping, etc., is possible depending on the place of use and in accordance with local requirements.

[0046] For this purpose, the embodiment of the vibration damper 10 according to the invention shown in Figure 1 has corresponding further features. For example, the base plate 30, as shown, has openings for air inlet or outlet, which can contribute to damping the corresponding vibrations, in particular through the opposing movement of the two sleeves 14, 16. The degree of damping itself can be adapted or adjusted to suit requirements by adjusting the openings, for example number, size, shape, etc. Furthermore, depending on requirements, it is also possible, alternatively or additionally, to provide corresponding air inlet and / or outlet openings in the cover 32 or on the sides of the first 14 and / or second sleeve 16.

[0047] In addition, the corresponding properties of the vibration absorber 10 can be further adjusted or parameterized by a corresponding change or distribution of the weight. The mass of the freely vibrating second sleeve 16 is in this case adjusted or increased accordingly by the additional masses 19. The one additional mass 19 is essentially a weight-reinforced cover 32 and the end of the second sleeve 16 is correspondingly weight-reinforced with the further discrete additional mass 19, in this case designed for example as a reversible, removable or replaceable disc. The discrete additional mass 19 can in this case also be designed as a ring or sleeve, for example, but can also take on all sorts of other useful shapes. Furthermore, the second sleeve 16 can also be made weight-reinforced overall, for example with thicker walls, etc., or partially, for example only the lower end.

[0048] In order to further secure and stabilize the guidance of the mutual or opposite movement of the two sleeves 14, 16 of the vibration damper 10 along the guide rod 12 and in particular to prevent mutual tilting of the first 14 and the second sleeve 16, the second sleeve 16 has a stabilizing sleeve 20 on the inside and additionally a further guide 22, for example a tube, along the guide rod 12.

[0049] In order to prevent damage to or destruction of the vibration damper 10, the vibration damper 10 has a stop 28, by means of which the movement of the two sleeves 14, 16, which can be moved against one another, along the guide rod can be limited. In this way, the movement amplitude of the two sleeves 14, 16 is limited to a desired amount and thus uncontrolled deflection, in particular in the case of an opposite movement, is prevented. The two sleeves 14, 16 are designed, as shown, such that the upper end of the first sleeve 14 and the lower end of the second sleeve 16 each have a corresponding reinforcement or thickening which locally reduces or enlarges the inside diameter of the housing of the second sleeve 16. the outer diameter of the housing of the first sleeve 14 is increased accordingly, so that as shown in Figure 2, with maximum, opposite deflection of the two sleeves 14, 16, i.e.the second sleeve 16 is deflected upwards in the direction of the suspension cable 3 and the first sleeve 14 is deflected downwards in the direction of the contact wire 2, the stop 28 of the first sleeve 14 hits the corresponding thickening at the end of the second sleeve 16, the opposing movement of the two sleeves 14, 16 stops and thus limits the movement amplitude accordingly. The weight-reinforced cover 32 of the second sleeve 16 has reached the joint 26 and the base or base plate 30 of the first sleeve 14 continues to lie on the joint 24. Accordingly, the respective total length of the two sleeves 14, 16 which can be moved relative to one another is available for the maximum possible deflection of the vibration damper 10, as shown in Figure 2. The spiral spring 18 is stretched accordingly.

[0050] Fig. 3 shows a cross section of a second embodiment of the vibration damper 50 according to the invention with a telescopic extension in the rest position, comprising three sleeves 14, 16 and 34, all three of which are pushed into one another and the third sleeve 34 is arranged between the first 14 and the second sleeve 16. The statements made for the embodiment of the vibration damper 10 according to Figures 1 and 2 can be transferred analogously to the telescopic version of the vibration damper 50 according to Figures 3 and 4 and are therefore also valid for this. The dimensions of the individual components, in particular the lengths of the guide rod 12 and the spiral spring 18, are adapted accordingly.Furthermore, the vibration damper 50 has an additional second stop 28 provided by the third sleeve 34, in order to provide the respective total length of the three mutually displaceable sleeves 14, 16, and 34, as shown in Figure 4, for the maximum possible deflection of the vibration damper 50 in this embodiment as well, while simultaneously preventing damage to or destruction of the vibration damper 50. Embodiments with further additional sleeves, i.e., with four or more parts or sleeves, are also possible.

[0051] In the embodiment of the vibration damper 50 with spiral spring 18 and the three sleeves 14, 16 and 34 according to Figures 3 and 4, a significantly larger vibration amplitude can be achieved in comparison to the overall length compared to the embodiment of the vibration damper 10 with spiral spring 18 and the two sleeves 14 and 16 according to Figures 1 and 2. This also makes a significantly larger ratio of maximum vibration amplitude to overall length possible compared to the embodiment of the vibration damper 10 with spiral spring 18 and the two sleeves 14 and 16 according to Figures 1 and 2. This increases accordingly with further additional sleeves.

[0052] The damping properties of the vibration dampers 10, 50 according to the invention according to Figures 1 to 4 can also be influenced, for example, via the friction properties of the moving parts 14, 16, 34, for example, not shown here, by using optional friction elements or the use of a low-wear coating of the rubbing surfaces of the moving parts 14, 16, 34, which in turn has a corresponding influence on the service life of the vibration damper 10, 50.

[0053] The embodiments of the vibration dampers 10, 50 according to the invention according to Figures 1 to 4 can also be designed without any problem in such a way that the geometry of the first part 14 and the second part 16 is exchanged. In these variants of the embodiments shown and described in Figures 1 to 4, the first part 14 is then connected directly to the joint 26 (instead of to the joint 24) and by means of this at least indirectly to the supporting cable 3. In the embodiment of the vibration damper 50 according to Figures 3 and 4, the arrangement of the third sleeve 34 between the first sleeve 14 and the second sleeve 16 must also be adapted accordingly.All of the above-mentioned further statements regarding the embodiments in Figures 1 to 4 are, without exception, transferable mutatis mutandis to the variants of the embodiments of the vibration damper 10, 50 according to the invention, in which the geometry of the first part 14 and the second part 16 is exchanged, and thus also apply without restriction to these variants of the vibration damper 10, 50 according to the invention.

Claims

Patent claims 1. Vibration damper (10, 50) for connection to an overhead line system, wherein the vibration damper (10, 50) is connected at least indirectly to at least one contact wire (2) and / or at least one supporting cable (3) of the overhead line system, characterized in that the vibration damper (10, 50) has a guide device (12), at least two, a first (14) and a second (16) part, parts (14, 16) which can be displaced relative to one another along the guide device (12), and at least one damping component (18).

2. Vibration damper (10, 50) according to claim 1, characterized in that the guide device (12) is connected to the overhead line system in an articulated manner by means of at least one joint (24, 26).

3. Vibration damper (10, 50) according to claim 1 or 2, characterized in that the guide device (12) is connected at least at one end to the contact wire (2) or to the supporting cable (3).

4. Vibration damper (10, 50) according to one of the preceding claims, characterized in that the vibration damper (10, 50) has at least one stop (28) by means of which the movement of the at least two mutually displaceable parts (14, 16) along the guide device (12) can be limited.

5. Vibration damper (10, 50) according to one of the preceding claims, characterized in that the guide device (12) is a guide rod.

6. Vibration damper (10, 50) according to claim 5, characterized in that the guide rod (12) is designed as a solid or hollow profile.

7. Vibration damper (10, 50) according to one of the preceding claims, characterized in that the first (14) and the second (16) part of the at least two mutually displaceable parts (14, 16) can be pushed into one another, wherein at least one (14, 16) of the at least two mutually displaceable parts (14, 16) is directly connected to the guide device (12).

8. Vibration damper (10, 50) according to one of the preceding claims, characterized in that the at least two parts (14, 16) which can be displaced relative to one another are each designed as a hollow profile.

9. Vibration damper (10, 50) according to one of the preceding claims, characterized in that the first (14) part has a base plate (30) and the second (16) part has a cover (32), wherein the base plate (30) and / or the cover (32) has at least one opening for air inlet or air outlet.

10. Vibration damper (10, 50) according to one of the preceding claims, characterized in that the at least one damping component (18) is connected at least at one end to one of the mutually displaceable parts (14, 16).

11. Vibration damper (10, 50) according to claim 10, characterized in that the at least one damping component (18) is designed as a spring.

12. Vibration damper (10, 50) according to claim 11, characterized in that the spring (18) is a spiral spring.

13. Vibration damper (10, 50) according to claim 11 or 12, characterized in that the spring (18) has a preload in the rest state.

14. Vibration damper (10, 50) according to one of the preceding claims, characterized in that the second (16) part of the at least two mutually displaceable parts (14, 16) is designed to swing freely along the guide device (12).

15. Vibration damper (10, 50) according to claim 14, characterized in that the second (16) part is at least partially weight-increasing and / or is designed with at least one discrete mass (19) arranged on the second (16) part.

16. Vibration damper (10, 50) according to claim 15, characterized in that the at least one discrete mass (14) is designed as a disc, ring or sleeve.

17. Vibration damper (10, 50) according to one of the preceding claims, characterized in that the second (16) part has a stabilizing sleeve (20) and / or an additional guide (22) along the guide device (12) in the interior.

18. Vibration damper (10, 50) according to one of the preceding claims, characterized in that the vibration damper (10, 50) has at least three parts (14, 16, 32) which can be displaced relative to one another along the guide device (12), the third (32) part being arranged between the first (14) and the second (16) part.

19. Overhead line system with at least one vibration damper (10, 50) according to one of claims 1 to 18.

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