Coupling rod for a rail vehicle
Patent Information
- Authority / Receiving Office
- EP · EP
- Patent Type
- Applications
- Current Assignee / Owner
- VOITH PATENT GMBH
- Filing Date
- 2024-07-25
- Publication Date
- 2026-05-27
Smart Images
Figure EP2024071122_13032025_PF_FP_ABST
Abstract
Description
[0001] Coupling rod for a rail vehicle
[0002] The present invention relates to a coupling rod for a rail vehicle according to the preamble of claim 1.
[0003] A coupling rod for a rail vehicle is used to transmit tensile and compressive forces between two adjacent carriages of the rail vehicle. Such coupling rods carry a coupling head at their first axial end and are connected to the bearing block of the rail vehicle with a second, opposite axial end, where they are held in the bearing block so that they can rotate about a vertical axis, in particular a vertical axis. A coupling rod of this type is used in
[0004] EP 1 905 661 A1 discloses the features known from this document. The features disclosed in this document are summarized in the preamble of claim 1.
[0005] Generic coupling rods feature an energy-absorbing element. Such an energy-absorbing element is designed to be destructive. Up to a predetermined impact force exerted on the coupling rod, the energy-absorbing element transmits this force without deformation. If a comparatively greater impact force is exerted on the coupling rod, the energy-absorbing element deforms irreversibly, whereby part of the impact energy is absorbed and dissipated by the energy-absorbing element and thus not transferred to the bearing block.
[0006] Such an energy-absorbing element comprises a deformation tube that is plastically deformed when the coupling rod is subjected to an impact force greater than the predetermined impact force. In coupling rods of this type, an inner tube engages the deformation tube with a head portion and rests against the deformation tube in the direction of the longitudinal axis of the coupling rod. For this purpose, the deformation tube comprises an enlarged portion at its axial end, which is wider in cross-section than an adjoining axial portion in the direction of the longitudinal axis. This creates a shoulder in the deformation tube against which the head portion of the inner tube can rest in the direction of the longitudinal axis.If an impact force less than or equal to the predetermined impact force is applied to the coupling rod in the direction of the longitudinal axis, this impact force is transferred in the direction of the longitudinal axis from the inner tube via the shoulder to the deformation tube, or vice versa, without deformation occurring. If an impact force greater than the predetermined impact force is applied to the inner tube or the deformation tube in the longitudinal direction, the inner tube is pushed further into the deformation tube with the head section in the direction of the longitudinal axis and, in the process, deforms the axial section of the deformation tube adjoining the expanded section in the direction of the longitudinal axis by expanding the deformation tube.
[0007] In order to be able to transmit tensile forces with the coupling rod, a tension rod is provided radially inside the deformation tube, which extends in the direction of the longitudinal axis into the inner tube and is connected to it and at least indirectly to the second axial end of the coupling rod in a tensile-resistant manner.
[0008] The disadvantage of conventional coupling rods is that they can hardly transmit any bending moment when the expansion tube is activated. Especially when the energy-absorbing element is triggered, the inner tube only contacts the section of the expansion tube that is currently being expanded and can therefore hardly absorb any bending forces. Any bending moments that may occur are then only transmitted by the tension rod with its low area moment of inertia. There is a greater risk of lateral buckling and thus failure of the coupling rod.
[0009] EP 1 990 251 A1 discloses an energy-absorbing device within a bearing block for a rail vehicle. In such a bearing block, the tensile and compressive forces are transmitted via the deformation tube. According to EP 1 990 251 A1, it is proposed that a guide element be connected to an inner bearing block part, extending into an axial section of the outer bearing block part, which has a cross-section that is reduced compared to the axial end of the bearing block.
[0010] US 2009 / 0065462 A1 discloses a shock absorber, particularly for use as an additional irreversible shock absorber stage together with a power transmission component. The shock absorber comprises a base plate, a force transmission element with a clamping element, an energy-absorbing element in the form of a deformation tube, which is connected to the base plate via a first end region, and a connecting element for releasably connecting the force transmission element to a second end region of the deformation tube. The connecting element is releasably connected to a support frame firmly connected to the base plate via a screw connection and presses against the clamping element, so that the deformation tube is clamped between the clamping element and the base plate without play. The clamping element engages with a conical ring in an axial end with an expanded cross-section of the deformation tube.
[0011] CN 105644580 A discloses an energy-absorbing device with a deformation tube, to which a coupling rod of a rail vehicle can be connected so as to be rotatable about a vertical axis. The deformation tube has an end section with an enlarged cross-section, into which a pressure tube is inserted. The pressure tube carries a guide part at its axial end, which bears radially from the inside both in the enlarged section and in an axial section adjoining the enlarged section of the deformation tube.
[0012] Although various designs of deformation tubes and inner tubes interacting for energy absorption in rail vehicle couplings, namely in the bearing block of such rail vehicle couplings, are known, and thus, in principle, no additional energy absorption device with a deformation tube is provided within the coupling rod, which can overcome the aforementioned problem of the low bending strength of the coupling rod, there is a desire in practice to also equip the coupling rod with an energy absorption device in addition to the energy absorption device in the bearing block, or as an alternative to it. In this case, the problem of the coupling rod's insufficient bending rigidity remains.
[0013] The present invention is therefore based on the object of specifying a coupling rod for a rail vehicle, which has an energy absorption device with a deformation tube and is designed to be particularly rigid
[0014] The object of the invention is achieved by a coupling rod having the features of claim 1. The dependent claims describe advantageous and particularly useful embodiments of the invention.
[0015] The coupling rod according to the invention for a rail vehicle extends along a longitudinal axis and has a first axial end to which a coupling head is or can be connected. For example, the coupling head is a coupling head of a Scharfenberg® coupling, i.e., a coupling with a funnel-cone coupling profile and a twist lock. Other designs of the coupling head, for example, with a Willison profile, are also conceivable.
[0016] The coupling rod has a second opposite axial end to which a bearing block is or can be connected so as to be pivotable about a vertical axis.
[0017] A tie rod, a deformation tube, and an inner tube are provided between the first axial end and the second axial end. The inner tube extends in the direction from the first axial end along the longitudinal axis to the deformation tube and dips into the deformation tube with a head portion facing away from the first axial end at the end of the inner tube.
[0018] The deformation tube extends from the second axial end along the longitudinal axis to the inner tube and encompasses its head section with an expanded section. This expanded section has a wider cross-section than an axial section of the deformation tube immediately adjacent to the longitudinal axis.
[0019] Both the inner tube and the deformation tube do not have to extend directly to the first axial end or second axial end of the coupling rod, but can each have a distance therefrom if further components of the coupling rod are provided there.
[0020] The pull rod extends correspondingly from the second axial end of the coupling rod within the deformation tube in the direction of the longitudinal axis into the inner tube and is connected to it in a tension-resistant manner. Thus, according to one embodiment, the pull rod can also extend directly to the second axial end, but according to an alternative embodiment, it can be spaced apart from the second axial end of the coupling rod.
[0021] In order to transmit tensile forces, the tension rod is also connected in a tensile-resistant manner at its axial end facing away from the inner tube, i.e., depending on its extension, directly or indirectly to the second axial end of the coupling rod. Accordingly, the inner tube is also connected directly or indirectly to the first axial end of the coupling rod so that tensile forces can be transmitted between the first and second axial ends via the coupling rod. According to the invention, an axial guide element adjoins the head section of the inner tube in the direction of the longitudinal axis and is at least indirectly effective in at least one region of the axial section of the deformation tube adjoining the expanded section.
[0022] The invention additionally introduces a bending moment exerted on the coupling rod, which is transferred from the tension rod to the deformation tube, into a region of the deformation tube where the deformation tube does not yet undergo plastic deformation, even upon application of an impact force that already leads to deformation of the deformation tube. Thus, when the energy absorption device formed by the inner tube and the deformation tube in the coupling rod responds, the region of bending moment transmission precedes the deforming region of the deformation tube in the direction of the longitudinal axis. This avoids a bending moment transmission that only occurs in a deforming region of the deformation tube.Traditionally, because almost no bending moment can be transmitted in the deformation area of the deformation tube, the entire bending moment had to be absorbed by the tension rod alone, which could lead to its breakage or the aforementioned tearing out. Thanks to the invention, part of the bending moment can now also be absorbed by the deformation tube.
[0023] The guide, which is provided by the design according to the invention and which precedes the deformation on the deformation tube when the permissible impact load is exceeded, thus transmits bending moments that occur to an area in which the deformation tube has not yet plastically deformed when it responds and is therefore able to transmit bending moments further.
[0024] In principle, two designs for the arrangement of the axial guide element are conceivable for transmitting the bending moments. In a first design, the axial guide element adjoining the head section of the inner tube in the direction of the longitudinal axis extends radially inside the axial section of the deformation tube, i.e. within the section of the deformation tube with a reduced cross-section compared to the extended section, in the direction of the longitudinal axis. In a second design, the axial guide element adjoining the head section of the inner tube in the direction of the longitudinal axis extends radially outside the axial section of the deformation tube, i.e. radially outside the section of the deformation tube with a reduced cross-section compared to the extended section, in the direction of the longitudinal axis. In both cases, the extension takes place over at least a partial area of the extension of the axial section of the deformation tube in the longitudinal direction.
[0025] In the first embodiment, the axial guide element is preferably supported radially inward against the pull rod and / or radially outward against the deformation tube. In the second embodiment, the axial guide element is preferably supported radially inward against the inner tube and / or deformation tube. All present definitions of the invention refer to a state of the coupling rod before deformation of the deformation tube due to a correspondingly large impact force.
[0026] According to an alternative embodiment of the first embodiment, the axial guide element is (initially) spaced radially from both the deformation tube and the tension rod. Thus, the axial guide element only engages the two components when a sufficiently large bending moment occurs.
[0027] According to one embodiment of the first embodiment of the invention, the axial guide element rests on the inner tube at its end face, in particular freely. Alternatively, the axial guide element is firmly connected to the inner tube at its end face.
[0028] According to a further embodiment of the first embodiment of the invention, the inner tube is displaceable relative to the axial guide element in the direction of the longitudinal axis. This can be achieved, for example, by the inner tube radially enclosing an axial section of the axial guide element on the outside, allowing it to slide along the longitudinal axis on the axial guide element. This has the advantage that the distance the inner tube can be pushed along the longitudinal axis into the deformation tube to deform it is reduced comparatively little by the axial guide element.
[0029] An alternative embodiment of the first embodiment, designed to minimize the impact on the displacement path of the inner tube in the deformation tube, provides an axial compression zone in the axial guide element, which can be reversibly or irreversibly compressed in the direction of the longitudinal axis when pressure is applied from both sides. This allows the axial length of the axial guide element to be reduced in the direction of the longitudinal axis when the inner tube is inserted into the deformation tube.
[0030] The last two measures mentioned are particularly advantageous if an end plate is arranged in the region of the second axial end of the coupling rod, to which the deformation tube is connected in the direction of the longitudinal axis, and the inner tube engages in the deformation tube in such a way that it pushes the axial guide element against the end plate by the impact in the direction of the longitudinal axis, deforming the deformation tube.
[0031] The second embodiment of the invention, which is characterized by the arrangement of the axial guide element radially outside the deformation tube, creates a rigid connection between the inner tube and the axial section with a reduced cross-section compared to the section with an expanded cross-section of the deformation tube, and thus, when the deformation tube responds, the elastic part thereof. In this case, the coupling rod can also be designed without a tie rod. The rigid connection in the second embodiment is characterized in that the axial guide element, in a first embodiment of the second embodiment, is preferably rigidly connected to the inner tube and, in a second embodiment, is either rigidly connected to the inner tube or to a fixed structure arranged behind the deformation tube.
[0032] In the first embodiment of the second embodiment, the axial guide element extends radially outside the deformation tube in the direction of the longitudinal axis and has a region which forms a guide region in cooperation with the deformation tube when it is deformed under impact load. For this purpose, the axial guide element is preferably designed as a tubular element which is connected to the inner tube in a first end region and forms a guide surface with its second end region oriented radially inwards, in particular towards the outer circumferential surface on the deformation tube. This region thus extends cantilevered away from the inner tube in the longitudinal direction. When the inner tube and deformation tube are pushed into one another when the maximum impact load designed for this is exceeded, the guide region on the axial guide element precedes the deformation on the deformation tube.The guide area is always assigned to the undeformed area of the deformation tube. The outer design of the axial guide element is thus supported on the inner tube on the one hand and on the deformation tube on the other, thus floating. This means that the guide is more or less freely movable.
[0033] The axial guide element in this first embodiment is preferably firmly connected to the inner tube and extends in the longitudinal direction in a sleeve-like manner over the area of the head section of the inner tube, the extended section on the deformation tube, up to a partial area of the extension of the axial section on the deformation tube. There, the axial guide element forms an area with a guide surface for interaction with the outer circumference of the deformation tube. In the second embodiment of the second embodiment, the rigid connection is also realized by an axial guide element, which is designed to extend radially outside the deformation tube over at least a partial area thereof. However, the axial guide element is supported on the one hand either at least indirectly, i.e. directly, or indirectly, on the inner tube. With direct support, the axial guide element can also be firmly connected to the inner tube, i.e.be connected to it. On the other hand, the axial guide element rests with its second end region on a support structure, whereby the deformation tube is also supported on this support structure.
[0034] In this embodiment of the second variant, the outer design of the axial guide element is thus indirectly supported on the inner tube on the one hand and on the deformation tube on the other. The axial guide element is preferably firmly connected to the inner tube or attached to it and extends longitudinally in a sleeve-like manner over the head section of the inner tube, the expanded section on the deformation tube, up to a structure arranged longitudinally downstream of the deformation tube, and interacts with this structure. The extension preferably extends over the entire extent of the axial section of the deformation tube. The deformation tube is supported on the support structure.
[0035] However, the reverse case is also conceivable, ie the axial guide element is connected to the structure and extends around the deformation tube to the inner tube and forms a guide area there.
[0036] According to an advantageous embodiment of the invention, in both versions, the radially inner tube has a conical ring at its head portion, with which the inner tube rests radially from the inside in the expanded section of the deformation tube. When the energy absorption device is not triggered, i.e., when the deformation tube is not yet deformed, this conical ring rests in the direction of the longitudinal axis in the expanded section of the deformation tube and is advantageously prestressed against it.
[0037] The axial guide element of the first embodiment can be supported radially inside the conical ring in the direction of the longitudinal axis on the inner tube, be firmly connected to it or be formed in one piece with it.
[0038] According to an alternative embodiment, the axial guide element is supported on the conical ring in the direction of the longitudinal axis, is firmly connected to it or is formed in one piece with it.
[0039] In order to ensure that the bending moment is transmitted in the direction of the longitudinal axis at a sufficient distance from a zone of the deformation tube that is currently deforming, the axial guide element preferably extends at a distance from the associated axial end of the inner tube in the non-deformed state of the deformation tube that corresponds to at least twice the axial length of the section of the inner tube that, in the non-triggered state, bears radially from the inside against the deformation tube, in particular the axial length of the conical ring. Alternatively, the axial guide element extends from the inner tube to such an axial distance from the inner tube, i.e. the length of the axial guide element is in particular at least twice the axial length of the section, in particular of the conical ring, with which the inner tube bears against the deformation tube.
[0040] The invention will be described below using exemplary embodiments and the figures.
[0041] They show:
[0042] Figure 1 shows a coupling rod designed according to the invention with a connected coupling head and a connected bearing block; Figure 2 shows an axial section through a coupling rod designed according to the invention;
[0043] Figure 3 is a schematic representation of a further embodiment of the invention in the region of the interface between the inner tube and the deformation tube;
[0044] Figure 4 is a schematic representation of a further embodiment of the invention in the region of the interface between the inner tube and the deformation tube;
[0045] Figure 5 is a schematic representation of a further embodiment of the invention in the region of the interface between the inner tube and the deformation tube;
[0046] Figure 6 is a schematic representation of a further embodiment of the invention in the region of the interface between the inner tube and the deformation tube;
[0047] Figure 7 is a schematic representation of a further embodiment of the invention in the region of the interface between the inner tube and the deformation tube;
[0048] Figure 8 is a schematic representation of a further embodiment of the invention in the region of the interface between the inner tube and the deformation tube;
[0049] Figure 9 is a schematic representation of a further embodiment of the invention in the region of the interface between the inner tube and the deformation tube; Figure 10 is a schematic representation of a further embodiment of the invention in the region of the interface between the inner tube and the deformation tube;
[0050] Figure 11 is a schematic representation of a further embodiment of the invention in the region of the interface between the inner tube and the deformation tube;
[0051] Figure 12 is a schematic representation of a further embodiment of the invention in the region of the interface between the inner tube and the deformation tube;
[0052] Figure 13 is a schematic representation of a first embodiment of the second embodiment of the invention in the region of the interface between the inner tube and the deformation tube;
[0053] Figure 14 is a schematic representation of a further embodiment of the second embodiment of the invention in the region of the interface between the inner tube and the deformation tube.
[0054] Figure 1 shows a coupling rod which extends along a longitudinal axis 1 from a first axial end 2 with a coupling head 3 to a second axial end 4 to which a bearing block 5 is connected so as to be rotatable about a vertical axis 6.
[0055] The internal structure of the coupling rod can be seen in Figure 2, although this structure is only to be considered as an example with regard to the details shown.
[0056] The coupling rod comprises a cylindrical, particularly tubular, element referred to as the inner tube 9, which, with a head portion 10 carrying a conical ring 14, extends into the expanded portion 11 at the axial end of a deformation tube 8. The axial portion 12 of the deformation tube 8, with a comparatively smaller cross-section, adjoins the expanded portion 11. An end plate 16 is arranged at the opposite axial end of the deformation tube 8, as well as at the outer axial end of the inner tube 9 in the region of the first axial end 2 of the coupling rod. However, this is not mandatory.
[0057] Tensile-tightly connected to the end plate 16, which adjoins the deformation tube 8, is a tension rod 7, which extends through the deformation tube 8 along the longitudinal axis 1 into the inner tube 9 and is there tensile-tightly connected to the inner tube 9, here by means of a screwed-on nut 17, which is supported in the direction of the second axial end 4 on a corresponding shoulder 18 of the inner tube 9.
[0058] The inner tube 9 may have an interior space 19 filled with a damping fluid.
[0059] Up to a predetermined limit, tensile forces and impact forces are transmitted deformation-free with the coupling rod between its first axial end 2 and second axial end 4. If, however, an impact force exceeds the predetermined limit, the inner tube 9 with the head section 10 slides into the deformation tube 8, thereby widening the transition between the expanded section 11 and the axial section 12 and subsequently the axial section 12 of the deformation tube 8, until it has displaced the axial guide element 13, which is connected to the end face of the inner tube 9, i.e. its head section 10, against the end plate 16 at the end of the deformation tube 8.
[0060] Since the axial guide element 13 always leads the deforming section of the deformation tube 8 in the direction of the longitudinal axis 1, when a bending moment occurs on the coupling rod, the axial guide element 13 acts on a region of the deformation tube 8 that is comparatively more stable than the region currently deforming. This allows a comparatively large bending moment to be transferred from the tension rod 7 to the deformation tube 8, preventing the tension rod 7 from breaking or breaking out.
[0061] Figures 3 to 14 illustrate exemplary possible connections and arrangements of the axial guide element 13 of a first or second embodiment of the invention, each in the non-triggered state of the energy-absorbing device formed by the inner tube 9 and the deformation tube 8. Corresponding reference numerals designate corresponding components. For the sake of simplicity, the illustrations merely schematically illustrate a section of an axial section through the coupling rod and, due to the rotationally symmetrical arrangement around the longitudinal axis 1, only a part, in particular the upper part of the sectional view.
[0062] Figures 3 to 12 show embodiments of the first embodiment. Figures 13 and 14 show embodiments of the second embodiment of the radial arrangement of the axial guide element.
[0063] According to Figure 3, the axial guide element 13 rests on the end face of the inner tube 9, radially on the outside on the axial section 12 of the deformation tube 8 and radially on the inside on the tie rod 7.
[0064] In the embodiment according to Figure 4, the axial guide element 13 rests on the end face of the inner tube 9 and radially on the inside of the tie rod 7, but is spaced radially from the deformation tube 8.
[0065] In the embodiment according to Figure 5, the axial guide element 13 rests on the end face of the inner tube 9 and radially outwardly on the axial section 12 of the deformation tube 8, but is at a distance in the radial direction from the pull rod 7. In the embodiment according to Figure 6, the axial guide element 13 again rests on the end face of the inner tube 9, radially outwardly on the axial section 12 of the deformation tube 8, and radially inwardly on the pull rod 7. This embodiment differs from the embodiment according to Figure 3, however, in that the axial guide element 13 has a web 20 with which it is supported on the inner tube 9 and which is at a distance in the radial direction from the deformation tube 8 and the pull rod 7. The web 20 serves to move the contact surfaces of the axial guide element 13 radially outwards or radially inwards even further into the interior of the deformation tube 8.
[0066] The embodiments according to Figures 4 and 5 also have a corresponding web 20.
[0067] Such a web 20 is reduced in cross-section compared to the axially outer end of the axial guide element 13 facing away from the inner tube 9. This creates the possibility for such a web 20 to buckle when the inner tube 9 has pressed the axial guide element 13 against the end plate 16 (see Figure 2), thus allowing further displacement of the inner tube toward the end plate 16.
[0068] In the embodiment according to Figure 7, the axial guide element 13 is formed integrally with the conical ring 14.
[0069] In the embodiment according to Figure 8, the axial guide element 13 is formed integrally with the inner tube 9.
[0070] In the embodiment according to Figure 9, the axial guide element 13 has an axial compression zone 15, particularly in the web 20. This deliberately weakens the axial guide element 13 against compressive forces, so that it can shorten in length in the direction of the longitudinal axis 1 (see Figure 2) after it has been pushed by the inner tube 9 against the end plate 16, thus allowing further displacement of the inner tube 9 in the direction of the end plate 16. Such an axial compression zone 15 can be achieved, for example, by a honeycomb element or a fiber composite structure.
[0071] In the embodiment according to Figure 10, the axial guide element 13 extends radially inside the inner tube 9. As a result, the inner tube 9 can slide on the axial guide element 13 in the direction of the longitudinal axis 1 (see Figure 2) and thus penetrate comparatively further into the deformation tube 8.
[0072] In the embodiments according to Figures 11 and 12, the axial guide element 13 is positioned at a distance from the inner tube 9.
[0073] In the embodiment according to Figure 11, the axial guide element 13 is held stationary on the pull rod 7 via predetermined breaking points. Such predetermined breaking points can be formed, for example, by O-rings 21, which hold the axial guide element 13 stationary on the pull rod 7 as long as the inner tube 9 has not yet struck the axial guide element 13. If, however, the inner tube 9 strikes the axial guide element 13 because it has been immersed sufficiently far into the deformation tube 8, the O-rings 21 release the axial guide element 13 relatively easily, so that it can be immersed further into the deformation tube 8 together with the inner tube 9 until it strikes the end plate 16 (see Figure 2).
[0074] In the embodiment according to Figure 12, the axial guide element 13 is arranged at the axial end of the deformation tube 8, which faces away from the inner tube 9. Thus, the inner tube 9 only hits the axial guide element 13 when the inner tube has been pushed into the deformation tube 8 with the maximum possible displacement. The axial guide element 13 can be fastened to the pull rod 7, to the deformation tube 8 and / or to the end plate 16 (not shown) (see Figure 2). In the embodiment according to Figure 13, a rigid connection is formed between the inner tube 9 and the deformation tube 8. For this purpose, the axial guide element 13 is arranged radially outside the inner tube 9 and the deformation tube 8, preferably in the shape of a sleeve or tube and extending in the direction of the longitudinal axis.The axial guide element 13 is connected in a first end region to the inner tube 9 and extends into the axial section 12, enclosing the deformation tube 8 in the radial direction and forming a distance between the deformation tube 9 and the axial guide element 13. The axial guide element 13 has a region which is preferably formed by the axial end section pointing in the longitudinal direction and opposite the connection region on the inner tube 9 and which forms one or a plurality of guide surfaces pointing in the radial direction to the outer circumference of the deformation tube 8 for supporting and guiding the latter when the deformation tube 8 responds.
[0075] The design according to Figure 14 is characterized compared to Figure 13 in that the rigid connection between the inner tube 9 and the deformation tube 8 is realized indirectly via a structure 22, in particular a stationary structure, which is arranged downstream of the deformation tube 8 in the axial direction at the end region directed away from the expanded section 11. This structure extends in the radial direction, forming a support surface 23, preferably directed in the axial direction, for the deformation tube 8 in the end region 24 directed away from the section 11 with the expanded cross-section.
[0076] 1 Longitudinal axis
[0077] 2 first axial end
[0078] 3 coupling head
[0079] 4 second axial end
[0080] 5 bearing block
[0081] 6 Vertical axis
[0082] 7 Drawbar
[0083] 8 Deformation tube
[0084] 9 inner tube
[0085] 10 head section
[0086] 11 extended section
[0087] 12 Axial section
[0088] 13 Axial guide element
[0089] 14 conical ring
[0090] 15 axial compression zone
[0091] 16 End plate
[0092] 17 Mother
[0093] 18 Shoulder
[0094] 19 Interior
[0095] 20 jetty
[0096] 21 O-ring
[0097] 22 Structure
[0098] 23 Support surface
Claims
Patent claims 1. Coupling rod for a rail vehicle, extending along a longitudinal axis (1); having a first axial end (2) to which a coupling head (3) is or can be connected; having a second axial end (4) to which a bearing block (5) is or can be connected so as to be pivotable about a vertical axis (6);with a tension rod (7), a deformation tube (8) and an inner tube (9), wherein the inner tube (9) extends in the direction from the first axial end (2) along the longitudinal axis (1) to the deformation tube (8) and dips into the deformation tube (8) with a head section (10) facing away from the first axial end (2), the deformation tube (8) extends in the direction from the second axial end (4) along the longitudinal axis (1) to the inner tube (9) and surrounds the head section (10) with an enlarged section (11) which is wider in cross-section than an axial section (12) adjoining in the direction of the longitudinal axis (1), and the tension rod (7) extends in the direction from the second axial end (4) within the deformation tube (8) in the direction of the longitudinal axis (1) into the inner tube (9) and is connected to it in a tensile-resistant manner;wherein the inner tube (9) can be pushed into the deformation tube (8) by applying an impact force in the direction of the longitudinal axis (1), thereby deforming the deformation tube (8); characterized in that an axial guide element (13) adjoins the head section (10) of the inner tube (9) in the direction of the longitudinal axis (1), which is at least indirectly effective in at least one region of the axial section (12) adjoining the expanded section (11).
2. Coupling rod according to claim 1, characterized in that the axial guide element (13) adjoining the head section (10) of the inner tube (9) in the direction of the longitudinal axis (1) extends radially inside or radially outside the axial section (12) of the deformation tube (8) in the direction of the longitudinal axis (1).
3. Coupling rod according to claim 1 or 2, characterized in that the axial guide element (13) is supported radially inwardly against the pull rod (7) and / or radially outwardly against the deformation tube (8).
4. Coupling rod according to one of claims 1 to 3, characterized in that the axial guide element (13) rests on the end face, in particular freely, on the inner tube (9).
5. Coupling rod according to one of claims 1 to 3, characterized in that the axial guide element (13) is firmly connected to the inner tube (9) at the end face.
6. Coupling rod according to one of claims 1 to 3, characterized in that the inner tube (9) is displaceable in the direction of the longitudinal axis (1) relative to the axial guide element (13).
7. Coupling rod according to claim 6, characterized in that the inner tube (9) encloses an axial section of the axial guide element (13) radially outwardly.
8. Coupling rod according to one of claims 1 to 5, characterized in that the radially inner tube (9) comprises a conical ring (14) on the head section (10), with which the inner tube (9) rests radially from the inside in the widened section (11) of the deformation tube (8).
9. Coupling rod according to claim 8, characterized in that the axial guide element (13) is supported radially inside the conical ring (14) in the direction of the longitudinal axis (1) on the inner tube (9), is firmly connected to it or is formed in one piece with it.
10. Coupling rod according to claim 8, characterized in that the axial guide element (13) in the direction of the longitudinal axis (1 ) on the conical ring (14) is supported, firmly connected to it or formed in one piece with it.
11. Coupling rod according to one of claims 1 to 10, characterized in that the axial guide element (13) has an axial compression zone (15) which is reversibly or irreversibly compressible when pressure is applied on both sides in the direction of the longitudinal axis (1).
12. Coupling rod according to one of claims 1 to 11, characterized in that in the region of the second axial end (4) an end plate (16) is arranged, to which the deformation tube (8) is connected in the direction of the longitudinal axis (1), and the inner tube (9) engages in the deformation tube (8) in such a way that it pushes the axial guide element (13) against the end plate (16) by the impact force in the direction of the longitudinal axis (1), deforming the deformation tube (8).
13. Coupling rod according to one of claims 1 to 2, characterized in that the axial guide element (13) is supported radially inwards against the inner tube (9) in a first axial end region and is supported radially inwards against the deformation tube (8) or a structure (22) arranged downstream of the deformation tube (8) in the longitudinal direction in a second axial region, in particular axial end region, arranged at a distance from the first axial end region.
14. Coupling rod according to claim 13, characterized in that the downstream structure (22) forms an axial support surface (24) for the deformation tube (8) in the end region of the deformation tube (8) facing away from the enlarged section (11) and the axial guide element (13) is firmly connected to the structure (22) at the end region facing away from the inner tube (9) in the longitudinal direction.
15. Coupling rod according to claim 13 or 14, characterized in that the axial guide element (13) is firmly connected to the inner tube (9) and forms a guide region for the deformation tube (8) in the second end region.
16. Coupling rod according to claim 14, characterized in that the axial guide element (13) is supported with a first end region on the inner tube (8) and with the second end region is connected to the structure (22), in particular connected thereto or formed integrally therewith.
17. Coupling rod according to claim 14, characterized in that the axial guide element (13) is firmly connected with a first end region to the inner tube (8), in particular is connected thereto or is formed integrally and is supported on the structure (22).