Vibration damping device for tension clamps

Abstract

The invention relates to a system (1) for fastening a rail to an underlying surface, comprising at least one angled guide plate (3) and a tension clamp (4) which is at least partially supported on the surface (3a) of the angled guide plate (3) facing away from the underlying surface, wherein the tension clamp (4) has a central portion (4a) for contact with a sleeper screw (5) and has a rail holding portion (4b) which rests on the rail foot in the mounted state of the rail, and two clamp arms (4c, d) connecting the central portion (4a) and the rail holding portion (4b), wherein the tension clamp (4) is provided at at least two points (4e, f) or surfaces for resting on the angled guide plate (3), and wherein the clamp arms (4c, d) are configured to be bent in such a way that, at least over a respective partial length of the clamp arms (4c, d), they are arranged spaced apart from the surface (3a) of the angled guide plate (3) facing away from the underlying surface, characterized in that the angled guide plate (3) has contact regions (6a, b) which are designed and configured to support and / or guide the clamp arms (4c, d) at least over a partial length of the clamp arms (4c, d).

Description

[0001] Schwihag AG, Konstanzerstrasse 70-72, CH-8274 Tägerwilen

[0002] Vibration damping device for clamping clamps

[0003] 1. Field of the invention

[0004] The invention relates to a system for fastening a rail to a substrate, comprising at least one angle guide plate and a clamping clamp that at least partially supports itself on the surface of the angle guide plate facing away from the substrate, wherein the clamping clamp has a central section for contact with a sleeper screw and a rail holding section which rests on the rail foot in the mounted state of the rail, and two clamping arms connecting the central section and the rail holding section, wherein the clamping clamp is provided at at least two points or surfaces for supporting an angle guide plate.

[0005] 2. State of the art

[0006] Systems for fastening a rail to a substrate, such as a slab track or a sleeper, are known in large numbers from the prior art. Such systems typically have an angled guide plate that is placed on the substrate and positioned directly adjacent to the rail foot. A clamping clamp is placed on this angled guide plate; this clamping clamp has at least one rail-holding section that rests on the rail foot from above and, when the clamping clamp is installed, presses down on the rail foot in such a way that a force-fit elastic connection is created between the rail fastening system and the rail itself.To mount the system, a sleeper screw is inserted through the clamping clamp's central section, which is typically loop-shaped or U-shaped, and through a bore in the angled guide plate into a dowel recessed in the substrate. It is then tightened to a predetermined torque. This torque elastically deforms the clamping clamp against both the angled guide plate and the rail foot in a predetermined manner, enabling the system to securely hold the rail in place and, during operation, to reliably absorb and preferably dampen vibrations and other forces acting on the system.

[0007] When a rail vehicle rolls over the track, strong vibrations can occur, exciting the rail body or rail itself to oscillate. The frequency range of these rail vibrations is known to depend on many factors, such as vehicle speed, bogie suspension, track maintenance, and the weight of the rail vehicle. The condition and shape of the rail's running surface also have a significant influence on the frequency range of the vibrations. Depending on the maintenance condition of a wheel tread and the overall running surface of a rail vehicle's wheel, corrugations can develop on the wheel's running surface. Depending on the corrugation spacing and the vehicle speed, vibrations can then be transmitted to the rail, which, in the worst case, may fall within the natural frequency range of the rail clamp.Due to associated resonance effects, these vibrations can ultimately lead to the breakage of the clamping device and thus to the failure of the entire system.

[0008] Solutions to this problem are already known from DE 10 2018 122 426 A1 and DE 20 2011 107 123 U1. However, these solutions have the disadvantage that the clamping device is only supported at two points on the angled guide plate located beneath it, and the clamping arms, via which the middle section of the clamping device is connected to the rail holding section, do not make contact with the

[0009] Angled guide plate, allowing unrestricted free movement. Object of the invention

[0010] It was therefore an object of the invention to provide a system for fastening a rail to a substrate which is capable of overcoming the problems known from the prior art and of adjusting and limiting the vibrations of a clamping device during operation of the system according to the invention. This object is achieved in accordance with the invention by a system comprising the features of claim 1. Advantageous embodiments of the invention are set out in the dependent claims and in the description. Summary of the invention

[0011] According to the invention, a system for fastening a rail to a substrate is provided, comprising at least one angle guide plate and a clamping clamp that at least partially supports itself on the surface of the angle guide plate facing away from the substrate, wherein the clamping clamp has a central section for contact with a sleeper screw and a rail holding section that rests on the rail foot in the mounted state of the rail, as well as two connecting the central section and the rail holding section

[0012] Clamping arms, wherein the clamping clamp is provided for bearing on the angle guide plate at at least two points or surfaces, and wherein the clamping arms are designed to be curved in such a way that they are spaced apart from the surface of the angle guide plate facing away from the substrate at least over a respective partial length of the clamping arms.

[0013] According to the invention, the angle guide plate has contact areas designed and configured to support and / or guide the clamping arms, at least over a portion of their length. This provides a system that supports and / or guides the clamping arms of the clamping clamp, which extend at a distance from the surface of the angle guide plate, in such a way that vibrations of the clamping arms are dampened and, preferably, the natural frequency of the clamping clamp as a whole is also changed so that the frequency range for the resonant vibrations of the clamping clamp can be reliably absorbed by the system according to the invention and the clamping clamp used therein during normal use of the system, even in the case of vibrations induced in the rail by corrugations on the running surface of the wheel.

[0014] The clamping arms, which according to the invention are to be supported and / or guided by the contact areas at least over a partial length, are understood to be those areas of the clamping clamp that connect the central section and the at least one rail holding section, offset laterally from the contact points or contact surfaces of the clamping clamp on the angled guide plate. The clamping arms thus extend between the contact points or contact surfaces on the angled guide plate on the one hand and the contact points or contact surfaces on the rail foot in the area of ​​the rail holding section on the other. These clamping arms are bent such that they are arranged at a distance from the surface of the angled guide plate, specifically from its flat surface, so that without the contact areas according to the invention, these clamping arms would be able to swing freely.The invention addresses this issue and provides contact areas that support and / or guide these clamping arms over a portion of their length, thereby dampening the vibrations within the clamping clamp where the vibration amplitude is highest during normal operation of the clamping clamp.

[0015] In a preferred embodiment of the invention, the angle guide plate has at least two support points on the side of the angle guide plate facing away from the rail. This creates a system in which the clamping clamp can be securely held on the surface of the angle guide plate facing away from the substrate and can be securely supported against the rail retaining section slipping off the rail foot.

[0016] Preferably, the movement of at least the first natural frequency of the clamping clamp is dampened by means of contact areas arranged laterally to the support points. The contact areas with the damping function according to the invention are located outside the heavily loaded zones of the clamping clamp's abutments in the form of the support points or surfaces. It is preferred if the damping elements only act in the case of excessively excited rail fastening systems or in the desired frequency ranges, which can be taken into account and adjusted when designing the shape and length of the contact areas. In this context, it is particularly preferred if the contact areas and their interaction with the clamping arms of the clamping clamp are designed such that a damping function only occurs in predefined frequency ranges of the vibrations.It is highly preferred if the damping function has a vibration-damping effect on high frequencies of the rail and does not affect low-frequency vibrations, for example caused by dipping of the rail when a train passes over it.

[0017] According to a further preferred embodiment of the invention, each contact area has a surface facing the clamping arms that is complementary to the contact surface of the clamping arms. This provides a system that securely supports and guides at least a portion of the clamping arms and is also precisely matched to the clamping arms contacting or within the contact areas. With complementary surfaces of the contact areas, the transmission and damping of vibrations from the clamping clamp to the angle guide plate is effectively supported over a predetermined length of the clamping arms using particularly simple means.

[0018] According to a further preferred embodiment of the invention, the contact areas are arranged separately from and adjacent to the support points on the surface of the angle guide plate facing away from the substrate, preferably directly adjoining it. This creates a compact angle guide plate capable of securely supporting and guiding the clamping arms, at least over a partial length, and also, if necessary, supporting transition areas from the central section to the respective clamping arms. Nevertheless, the support points and the contact areas are functionally and spatially separated from one another.

[0019] In this context, it is particularly preferred if the contact areas are arranged laterally outwards with respect to the support points on the angle guide plate, preferably on the surface of the angle guide plate facing away from the substrate. This creates a system that is optimally adapted to the shape of the clamping clamp to be supported and guided.

[0020] In a further preferred embodiment of the invention, the contact areas and the support points are arranged to protrude from the surface of the angled guide plate facing away from the substrate. It is particularly preferred if the contact areas and the support points are an integral part of the angled guide plate, preferably manufactured together with it by injection molding. This creates a system that features particularly cost-effective components which, moreover, provide the required safety against material failure for the system according to the invention.

[0021] In a further preferred embodiment of the invention, the contact areas are designed to provide a damping function for vibrations of the clamping clamp, in particular to limit the amplitude of vibrations of the clamping arms. It is also preferred if the contact areas are designed such that their surfaces facing the clamping arms are at least partially in contact with one another. In particular, it is preferred if the clamping clamp is connected to the angle guide plate in such a way that, at least in the assembly state with the threshold screw tightened to the intended assembly torque, the clamping arms are clamped between at least two contact areas. This creates a system that enables the clamping clamp to be arranged securely on the surface of the angle guide plate facing away from the substrate and, moreover, can provide the preferred damping function by particularly reliable means.

[0022] In a further preferred embodiment of the invention, the surfaces of the contact areas facing the clamping arms are preferably completely covered with a vibration-damping element, which can very preferably be designed to be replaceable. This vibration-damping element is preferably made of a damping material made of plastic or comprises a damping material made of plastic. Brief description of the figures

[0023] The invention is explained in more detail below with reference to three figures, from which a preferred embodiment of the invention is evident, but which is not suitable to limit the scope of protection of the invention as defined in the pending claims.

[0024] The figures show

[0025] Fig. 1 shows a side view of an angle guide plate as part of a system according to the invention.

[0026] Fig. 2 is a perspective view of the angle guide plate from Fig. 2, and

[0027] Fig. 3 shows a perspective view of a system according to the invention consisting of an angle guide plate and a clamping clamp. Detailed description of the figures

[0028] Fig. 1 shows a side view of a device according to the invention.

[0029] Angle guide plate 3, oriented towards the side of the angle guide plate 3 facing away from the (not shown) rail. The angle guide plate 3 has a surface 3a facing away from the (not shown) substrate, on which a (not shown) clamping clamp is to be placed to form a system according to the invention. Several projections are shown on the surface 3a of the angle guide plate 3, in particular two support points 6c, 6d and a bearing point 6e with two guides for the (not shown) central section of a (not shown) clamping clamp. Two contact areas 6a, 6b adjoin the two support points 6c, 6d laterally, which have mutually facing surfaces between which the (not shown) clamping arms of a (not shown) clamping clamp can be arranged to rest against or be clamped.On the mutually facing surfaces of the contact areas 6a, 6b, layers 6f, g made of a vibration-damping material, preferably plastic, are provided which interact with the (not shown) clamping clamp in such a way that the high-frequency vibrations of the (not shown) clamping arms are dampened.

[0030] Fig. 2 shows a perspective view of the angle guide plate 3 from Fig. 2, from which the arrangement of the support points 6c, 6d, 6e and the contact areas 6a, 6b are more clearly visible. In particular, the design of the mutually facing surfaces of the contact areas 6a, 6b is shown, with a shape complementary to a (not shown) clamping clamp, so that sections of the (not shown) clamping arms of a (not shown) clamping clamp can be securely and slip-free supported and guided between the contact areas 6a, 6b.

[0031] Finally, Fig. 3 shows a perspective view of a system 1 according to the invention, comprising the angle guide plate 3 according to Figures 1 and 2 and a clamping clamp 4, which is arranged on the angle guide plate 3 such that its central section 4a, which forms the shape of a loop or a U, is spaced apart from the surface 3a of the angle guide plate 3 and is located above a through-hole 7 for a sleeper screw (not shown). The clamping clamp 4 extends from the central section 4a over two clamping arms 4c, 4d arranged symmetrically to the central section 4a to a rail holding section 4b, which, in the illustrated embodiment of the clamping clamp 4, comprises two exposed ends which, in the illustrated embodiment of the system 1 according to the invention, project beyond the angle guide plate 3 and rest on a rail foot (not shown) of a rail (not shown).When a sleeper screw (not shown) is clamped to the (not shown) mounting plate, the clamping clamp 4 rests on the surface 3a of the angle guide plate 3 in such a way that the transition areas from the central section 4a to the clamp arms 4c, 4d are prevented from slipping away from the (not shown) rail via the support points 6c, 6d. The clamping clamp 4 is in contact with the angle guide plate 3 at its bearing points 4e, f, and also with the support points 6c, d protruding from the surface 3a of the angle guide plate 3.

[0032] The clamping arms 4c, 4d in turn are embedded over a partial length in the contact areas 6a, 6b on the angle guide plate 3 in such a way that the free length of the clamping arms 4c, 4d is shortened compared to angle guide plates without contact area 6a, 6b.

Claims

Patent claims 1. System (1) for fastening a rail to a substrate, comprising at least one angle guide plate (3) and a clamping clamp (4) that is at least partially supported on the surface (3a) of the angle guide plate (3) facing away from the substrate, wherein the clamping clamp (4) has a central section (4a) for contact with a sleeper screw and a rail retaining section (4b) that rests on the rail foot when the rail is mounted, and two clamping arms (4c, d) connecting the central section (4a) and the rail retaining section (4b), wherein the clamping clamp (4) is provided for bearing on the angle guide plate (3) at at least two points (4e, f), and wherein the clamping arms (4c, d) are bent such that they are spaced apart from the surface (3a) of the angle guide plate (3) facing away from the substrate at least over a respective partial length of the clamping arms (4c, d), characterized in thatthat the angle guide plate (3) has contact areas (6a, b) which are designed and configured to support and / or guide the clamping arms (4c, d) at least over a partial length of the clamping arms (4c, d).

2. System according to claim 1, characterized in that the angle guide plate (3) has at least two support points (6c, d) on the side (3b) of the angle guide plate (3) facing away from the rail.

3. System according to one of the preceding claims, characterized in that each contact area (6a, b) has a surface facing the clamping arms (4c, d) which is designed to be complementary to the contact surface of the clamping arms (4c, d).

4. System according to one of claims 2 or 3, characterized in that the contact areas (6a, b) are arranged adjacent to and separate from the support points (6c, d) on the surface (3a) of the angle guide plate (3) facing away from the substrate, preferably directly adjoining it.

5. System according to claim 4, characterized in that the contact areas (6a, b) are offset laterally outwards with respect to the support points (6c, d) on the angle guide plate (3), preferably on the are arranged on the surface (3a) of the angle guide plate (3) facing away from the substrate.

6. System according to one of claims 2 to 5, characterized in that the contact areas (6a, b) and the support points (6c, d) are arranged projecting from the surface (3a) of the angle guide plate (3) facing away from the substrate.

7. System according to one of claims 5 or 6, characterized in that the contact areas (6a, b) and the support points (6c, d) are an integral part of the angle guide plate (3), preferably manufactured together with it by injection molding.

8. System according to one of the preceding claims, characterized in that the contact areas (6c, d) are designed to provide a damping function for vibrations of the clamping clamp (2), in particular limiting the amplitude of vibrations of the clamping arms (4c, d).

9. System according to one of the preceding claims, characterized in that the contact areas (6c, d) are designed such that their surfaces facing the clamping arms (4c, d) are at least partially facing each other.

10. System according to one of the preceding claims, characterized in that the clamping clamp (4) is connected to the angle guide plate (3) in such a way that, at least in the assembly state, with the threshold screw tightened with the intended assembly torque, the clamping arms (4c, d) are clamped between at least two contact areas (6a, b).

11. System according to one of claims 3 to 10, characterized in that the surfaces of the contact areas (6a, b) facing the clamping arms (4c, d) are preferably completely covered with a vibration-damping element (6f, g).

12. System according to claim 11, characterized in that the vibration-damping element (6f, g) comprises a damping material made of plastic.

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