Fluidic coupling device and chassis

Abstract

The invention relates to a fluidic coupling device for coupling components, in particular for a chassis of a rail vehicle, comprising a variable-size first fluid chamber (5), a variable-size second fluid chamber (6), and a first fluid line (10) connecting the first fluid chamber (5) to the second fluid chamber (6), wherein the first fluid chamber (5) and the second fluid chamber (6) can be supplied with fluid (12) to adjust the coupling stiffness of the coupling device. It is proposed that a third fluid chamber (7) be connected to the first fluid line (10) via a second fluid line (11), wherein the second fluid line (11) is the sole fluid line for conveying fluid (12) into and out of the third fluid chamber (7) and has a smaller cross-section than the first fluid line (10) at least in a capillary section (13).This reduces the influence of temperature on the coupling stiffness of the coupling device.

Description

[0001] The invention relates to a fluidic coupling device for coupling components, in particular for a chassis for a rail vehicle, comprising a variable-size first fluid chamber, a variable-size second fluid chamber, and a first fluid line connecting the first fluid chamber to the second fluid chamber, wherein the first fluid chamber and the second fluid chamber can be supplied with fluid to adjust the coupling stiffness of the coupling device, wherein a third fluid chamber is connected to the first fluid line via a second fluid line, wherein the second fluid line is arranged as the sole fluid line for conveying fluid into and out of the third fluid chamber and has a smaller cross-section than the first fluid line, at least in one capillary section.

[0002] In many mechanical engineering applications, adjusting the coupling stiffness between components to be coupled is desirable or even necessary.

[0003] One possible application for coupling devices with adjustable coupling stiffness is, for example, wheel or wheelset guidance systems for the bogies of rail vehicles. Wheel or wheelset guidance systems couple wheelsets or individual wheels of bogies to a supporting structure (e.g., a bogie frame). These systems can incorporate hydraulic bushings, for example, which adjust or vary the wheel or wheelset guidance stiffness as needed. To reduce wear and noise, a low wheel or wheelset stiffness is often desired on curved track sections, while a high wheel or wheelset stiffness is preferred on straight track sections to increase running stability.

[0004] For example, WO 2014 / 154315 A1 discloses a fluidic bearing with a core and a shell encasing the core. Two fluid chambers are arranged between the core and the shell, connected to each other by a fluid channel. A compensating chamber is also arranged, from which fluid can be introduced into the two fluid chambers. The compensating chamber is fluidically coupled to the two fluid chambers via a plurality of fluid lines, each fluid line comprising a valve and a throttle.

[0005] The aforementioned approach, in its known form, suffers from the disadvantage of high complexity. It shows multiple fluid lines for coupling the compensation chamber, and also incorporates fluidic control elements.

[0006] Furthermore, WO 2017 / 157740 A1 discloses a coupling device used for wheel or wheelset control. An actuator unit and an elastic bearing are shown, arranged in parallel and through which a wheel or wheelset is coupled to a chassis frame. The elastic bearing can be designed as a hydraulic bearing.

[0007] The aforementioned approach, in its known form, has the disadvantage that no means are apparent for reducing the effects of temperature influences to which a fluid in the bearing is exposed.

[0008] Furthermore, EP 1 220 757 A1 describes a hydraulic system for a vehicle in which hydraulic chambers with movable pistons are connected to each other via hydraulic lines. The hydraulic lines are coupled to hydraulic accumulators via capillary lines.

[0009] The invention is based on the objective of providing a fluidic coupling device that is further developed compared to the prior art and is designed to be particularly simple and robust in terms of reducing the effects of temperature influences.

[0010] According to the invention, this problem is solved with a fluidic coupling device according to claim 1, in which a control body with a through-channel aligned parallel or approximately parallel to the first fluid line and an access opening connected to the through-channel is movably arranged in the first fluid line and in a first control state of the first fluid chamber and the second fluid chamber unloaded by coupling forces a fluidic connection between the second fluid line and the through-channel is formed via the access opening, or in which the control body is movably arranged in the first fluid line and a distance for fluid transport is provided between the first fluid line and the control body.

[0011] This results in a particularly simple fluidic coupling between the third fluid chamber on the one hand, and the first and second fluid chambers on the other. Additional lines between the third fluid chamber and the first and second fluid chambers, as well as fluidic control elements, are not required due to the capillary section.

[0012] The capillary section ensures that, when the temperature of a fluid that may be filled into the coupling device falls below a certain temperature threshold (e.g., the fluid temperature during the coupling device's filling process), fluid flows from the third fluid chamber towards the first or second fluid chamber. This reduces the risk of fluid pressure drops in the first or second fluid chamber at low temperatures, which would otherwise lead to a decrease in the coupling device's stiffness. At temperatures above the temperature threshold, fluid flows into the third fluid chamber due to capillary action within the capillary section. This prevents an excessive increase in fluid pressure in the first or second fluid chamber at high temperatures, which would otherwise lead to an excessive increase in the coupling device's stiffness.This results in an increased service life of the coupling device.

[0013] The effects of temperature fluctuations on the fluid are reduced. This ensures that the fluid pressure in the first fluid chamber and / or the second fluid chamber remains within a specified tolerance range despite temperature variations.

[0014] This also allows for the following in the unloaded first control state: (z.B. in a neutral state, in which the coupling device is not loaded and in which a constant static fluid pressure prevails in the first fluid chamber or in the second fluid chamber), the fluid flows between the third fluid chamber on the one hand and the first fluid chamber and the second fluid chamber on the other.

[0015] Further advantageous embodiments of the fluidic coupling device according to the invention are set out in the dependent claims.

[0016] For example, a simple solution for the second fluid line can be obtained if at least one capillary section is designed as a cylindrical capillary flow channel.

[0017] To achieve capillarity in the second fluid line, it can also be helpful if at least one capillary section is designed as an orifice with a slit or a gap.

[0018] It can also be advantageous if the second fluid line is oriented vertically or almost vertically.

[0019] This measure means that the flow of fluid into or out of the third fluid chamber is influenced by gravity. Depending on the arrangement of the third fluid chamber, gravity can, for example, facilitate the flow of fluid out of the third fluid chamber or hinder the flow of fluid into the third fluid chamber.

[0020] A flow of fluid between the third fluid chamber on the one hand and the first fluid chamber or the second fluid chamber on the other hand can be prevented in a loaded state of the coupling device if, in a second control state of the first fluid chamber and the second fluid chamber loaded by coupling forces, the fluidic connection between the second fluid line and the passage channel is blocked by an offset between the second fluid line and the access opening.

[0021] A favorable design is achieved if the third fluid chamber has an opening to an outside of the coupling device, which is closed by means of a gas-tight and liquid-tight seal.

[0022] This measure allows the third fluid chamber to be completely encapsulated by the coupling device, resulting in a high level of strength for the coupling device and protection for the first, second, and third fluid chambers, as well as the first and second fluid lines. Furthermore, due to the gas-tight seal of the third fluid chamber, it can be filled with nitrogen above a certain fluid level, thus preventing oxidation processes within the coupling device and allowing a defined pre-pressure to be maintained.

[0023] Furthermore, it is advantageous if a transport locking screw is inserted into a coupling element body of the coupling device in which the third fluid chamber, the first fluid line and the second fluid line are arranged, which has a through-opening which, in a tightened first locking state of the transport locking screw, is formed as a line part of the second fluid line.

[0024] In the first secure state, installation or assembly of the coupling device (e.g. in a chassis) and a flow of fluid between the third fluid chamber on the one hand and the first fluid chamber or the second fluid chamber on the other hand is possible.

[0025] Flow between the third fluid chamber on the one hand and the first fluid chamber or the second fluid chamber on the other hand is prevented (e.g. during transport of the coupling device) if, in a released second locking state of the transport locking screw, the second fluid line is interrupted by the transport locking screw, wherein the transport locking screw protrudes beyond a boundary surface of the coupling element body in the second locking state.

[0026] Because the transport locking screw protrudes beyond a boundary surface of the coupling element body in the second locking state, installation or assembly of the coupling device (e.g. in a chassis) is not possible in the second locking state.

[0027] A compact coupling device is obtained if the fluidic coupling device has a core and a shell that at least partially encloses the core, in which the first fluid chamber, the second fluid chamber, the third fluid chamber, the first fluid line and the second fluid line are arranged.

[0028] A bushing-bolt connection with variable stiffness can be realized if the first fluid chamber and the second fluid chamber are arranged in a bushing and the first fluid line, the second fluid line and the third fluid chamber are arranged in a bolt, with the bolt being inserted into the bushing.

[0029] A promising field of application for the coupling device according to the invention is opened up with a chassis for a rail vehicle with at least one fluidic coupling device according to the invention. In connection with the chassis, a preferred solution is obtained if the at least one fluidic coupling device is a wheel guidance device or a first wheelset guidance device with a wheel guide bushing or wheelset guide bushing and a wheel guide pin or wheelset guide pin.

[0030] This results in the wheel or first wheelset guide device exhibiting variable wheel or wheelset guide stiffness. In a mechanically strong (d.h. In the high-frequency excited state of the coupling device (for example, during straight-line travel of the chassis at high speed), the wheel or wheelset guidance stiffness is high, resulting in high running stability of the chassis. In a mechanically weak (d.h. In the low-frequency excited state of the coupling device (for example, when the chassis is cornering at low speed), the wheel or wheelset guidance stiffness is low, thereby reducing wheel and rail wear. Temperature influences on the wheel or wheelset guidance stiffness properties of the chassis are reduced due to the use of the coupling device according to the invention.

[0031] The invention will now be explained in more detail using exemplary embodiments.

[0032] They show, for example: Fig. 1: An oblique view of an exemplary first embodiment of a fluidic coupling device according to the invention in a sectional view with a transport locking screw in a tightened first locking state and with a control body. Fig. 2: An oblique view of the exemplary first embodiment of a fluidic coupling device according to the invention in a sectional view, in which a first fluid chamber is visible. Fig. 3: An oblique view of an exemplary second embodiment of a fluidic coupling device according to the invention in a sectional view with a transport locking screw in a loosened second locking state and with a control body.Fig. 4: A schematic cross-sectional view of an exemplary third embodiment of a fluidic coupling device according to the invention, showing a control body in a first control state with an open fluidic connection; Fig. 5: A schematic cross-sectional view of an exemplary fourth embodiment of a fluidic coupling device according to the invention, showing a control body in a second control state with a closed fluidic connection; and Fig. 6: A schematic cross-sectional view of a section of an exemplary embodiment of a chassis according to the invention, showing a fluidic coupling device according to the invention designed as a first wheelset guide device.

[0033] Fig. 1 Figure 1 shows an oblique projection of an exemplary first embodiment of a fluidic coupling device according to the invention. The coupling device is for coupling components of a chassis of a rail vehicle, as exemplified in Fig. 6 The coupling device is designed as follows: A first wheelset 1 of the chassis is coupled to a chassis frame 3 of the chassis via a first swing arm 2 of the chassis. The coupling device thus serves as the first wheelset guidance device of the chassis. The coupling device is designed as a bushing-pin connection. A bushing 4, which is connected to the chassis frame 3, contains a Fig. 2 The first fluid chamber 5, which is variable in size, and a second fluid chamber, which is not shown, are arranged in the diagram. A third fluid chamber 7, which is encapsulated by the bushing 4, as well as a first fluid line 10 and a second fluid line 11, are arranged in a bolt 8 inserted into the bushing 4, which acts as a coupling element body 9. The bolt 8 acts as the core of the coupling device, and the bushing 4 as the shell of the coupling device that encloses the core. The first fluid chamber 5, the second fluid chamber, the third fluid chamber 7, the first fluid line 10, and the second fluid line 11 are arranged in an assembly consisting of the core and the shell.

[0034] The first fluid line 10 connects the first fluid chamber 5 with the second fluid chamber, wherein the first fluid chamber 5 and the second fluid chamber are connected to a fluid 12 for adjusting the coupling stiffnesses of the coupling device, as exemplified in Fig. 4 and Fig. 5 The fluid 12 shown is glycol for the exemplary first embodiment of the coupling device according to the invention.

[0035] The third fluid chamber 7 is connected to the first fluid chamber 10 via the second fluid line 11. The second fluid line 11 is the only fluid line for conveying fluid 12 from the first fluid chamber 5 or the second fluid chamber via the first fluid line 10 into the third fluid chamber 7, and vice versa. In a capillary section 13, the second fluid line 11 has a smaller cross-section than the first fluid line 10. The second fluid line 11 is oriented perpendicular to the first fluid line 10. The capillary section 13 is designed as an orifice with a slot or gap.

[0036] In the first fluid line 10 is a tubular control body 14 with a through-channel 15 aligned parallel to the first fluid line 10, as exemplified in Fig. 4 and Fig. 5 The control body 14 is visible and is slidably, i.e., movablely, arranged at an access opening 16 connected to the through-channel 15. The control body 14 abuts walls of the first fluid line 10.

[0037] In a first control state of the first fluid chamber 5 and the second fluid chamber, unloaded by coupling forces, a fluidic connection is formed between the second fluid line 11 and the through-channel 15 via the access opening 16. This first control state is not in Fig. 1 , however, for example in Fig. 4 shown. In Fig. 1 is a second control state of the first fluid chamber 5 and the second fluid chamber, subject to coupling forces, in which the fluidic connection between the second fluid line 11 and the passage channel 15 is blocked by an offset between the second fluid line 11 and the access opening 16.

[0038] The third fluid chamber 7 has an opening 17 to an outer surface of the coupling device, which is sealed by a gas-tight and liquid-tight closure 18. The third fluid chamber 7 is thus hermetically sealed. No liquid or gas can unintentionally enter or escape from the third fluid chamber 7. Due to the closure 18, which is removable, it is possible, for example, to fill the third fluid chamber 7 with nitrogen without it escaping. The third fluid chamber 7 can also be filled with fluid 12 via the opening 17.

[0039] A transport locking screw 19 is inserted into the bolt 8 or into the coupling element body 9. Its longitudinal axis is aligned perpendicular to the second fluid line 11, and it has a through-opening 20. In the first locked position of the transport locking screw 19, the through-opening 20 functions as a conduit for the second fluid line 11, allowing fluid 12 to flow through the transport locking screw 19. In the first locked position, the screw head of the transport locking screw 19 is flush with a boundary surface 21 of the coupling element body 9.

[0040] As opposed to Fig. 1 , which shows the first backup state, is in Fig. 3 a second locking state is revealed in which the transport locking screw 19 is loosened and the second fluid line 11 is interrupted by the transport locking screw 19.

[0041] Fig. 2 reveals an oblique view of that exemplary first embodiment of a fluidic coupling device according to the invention, which is also shown in Fig. 1 is shown. In comparison with Fig. 1 shows Fig. 2 Another view of the coupling device.

[0042] A first fluid line 10 is arranged in a bolt 8 or a coupling element body 9. This fluid line is connected to a first fluid chamber 5, which is arranged in a bushing 4. The bolt 8 is inserted into or adjacent to the bushing 4.

[0043] One in Fig. 2 The second fluid chamber, which is not visible, is located opposite the first fluid chamber 5 in the socket 4. The first fluid line 10 is also connected to the second fluid chamber.

[0044] In bolt 8 are, as in connection with Fig. 1 described, a third fluid chamber 7 and a second fluid line 11 are arranged, which are in Fig. 2 are not visible. The second fluid line 11 is connected to the third fluid chamber 7 and to the first fluid line 10. The socket 4 is connected to a Fig. 2 The coupling device is encased in an elastomer layer (not shown) through which loads can be transferred to the first fluid chamber 5 and the second fluid chamber. Loading and unloading processes of the elastomer layer in the area of ​​the first fluid chamber 5 and / or the second fluid chamber cause a change in the size of the first fluid chamber 5 or the second fluid chamber, respectively.

[0045] In Fig. 3 Figure 1 shows an oblique projection of an exemplary second embodiment of a fluidic coupling device according to the invention.

[0046] This exemplary second embodiment corresponds structurally to that exemplary first embodiment of a coupling device according to the invention, which is described in Fig. 1 und Fig. 2 is shown. Therefore, in Fig. 3 the same reference symbols as in Fig. 1 used.

[0047] In connection with Fig. 1 This describes a first locking state of a transport locking screw 19 of the coupling device. In contrast, it shows Fig. 3 the coupling device in a second locking state.

[0048] The coupling device has a first fluid chamber 5, as exemplified in Fig. 2 The figure shows a second fluid chamber (not visible), a third fluid chamber 7, a first fluid line 10, and a second fluid line 11. The first fluid line 10 connects the first fluid chamber 5 and the second fluid chamber. The third fluid chamber 7 is connected to the first fluid line 10 via the second fluid line 11.

[0049] The transport securing screw 19 is inserted into a bolt-shaped coupling element body 9 of the coupling device. The transport securing screw 19 is located in the area of ​​the second fluid line 11. bzw. protrudes through them.

[0050] In the second locking state of the transport locking screw 19, the second fluid line 11 is interrupted by the transport locking screw 19 (there is an offset between a passage opening 20 of the transport locking screw 19 and the second fluid line 11), whereby the transport locking screw 19 is loosened and protrudes beyond a boundary surface 21 of the coupling element body 9.

[0051] Fig. 4 shows a schematic elevation of an exemplary third embodiment of a fluidic coupling device according to the invention.

[0052] In a coupling element body 9, a first fluid chamber 5, a second fluid chamber 6, a third fluid chamber 7, a first fluid line 10 and a second fluid line 11 are arranged.

[0053] In that one in Fig. 4 In the shown installation state of the coupling device, the first fluid line 10 is horizontally aligned and the second fluid line 11 is vertically aligned.

[0054] The first fluid line 10 connects the first fluid chamber 5 and the second fluid chamber 6. The third fluid chamber 7 is coupled to the first fluid line 10 via the second fluid line 11.

[0055] The second fluid line 11 is the only fluid line for conveying a fluid 12 into and out of the third fluid chamber 7 in the coupling device. In the exemplary third embodiment of the coupling device according to the invention, the fluid 12 is glycol.

[0056] A first elastomeric stop 22 is connected to the first fluid chamber 5, and a second elastomeric stop 23 is connected to the second fluid chamber 6. When the first elastomeric stop 22 and / or the second elastomeric stop 23 is loaded or unloaded, the first fluid chamber 5 and the second fluid chamber 6, respectively, change their size.

[0057] A capillary section 13 extends over the total length of the second fluid line 11, wherein the second fluid line 11, or the capillary section 13, is designed as a cylindrical capillary flow channel and has a smaller cross-section than the first fluid line 10. A radius r, i.e., a cross-sectional area of ​​the capillary section 13, is determined by a surface tension σ of the fluid 12 introduced into the capillary section 13, a contact angle θ between the capillary section 13 and the fluid 12, a density ρ of the fluid 12, the acceleration due to gravity g, and a length l of the capillary section 13.

[0058] The radius r can be determined using the following functional relationship based on a known capillary equation: r = 2 σcosθ ρgl

[0059] In the first fluid line 10, a tubular control body 14 with a through channel 15 aligned parallel to the first fluid line 10 and an access opening 16 connected to the through channel 15 is arranged extending and displaceable through the first fluid line 10, i.e. movable.

[0060] The control body 14 borders a wall of the first fluid line 10 and has a flange-like first end section 24 and a flange-like second end section 25, which limit movements of the control body 14 in the first fluid line 10.

[0061] The control element 14 projects into the first fluid chamber 5 and into the second fluid chamber 6, with the first end section 24 being located in the first fluid chamber 5 and the second end section 25 in the second fluid chamber 6. Fluid 12 can flow between the first fluid chamber 5 and the second fluid chamber 6 through the passage channel 15. According to the invention, it is also conceivable to design the first end section 24 and the second end section 25 in a manner other than flange-like.

[0062] Fig. 4 Figure 1 shows a first control state of the first fluid chamber 5 and the second fluid chamber 6, unloaded by coupling forces. In this first control state, a fluidic connection is formed between the second fluid line 11 and the through-channel 15 via the access opening 16. This means that a continuous channel is formed between the first fluid chamber 5 and the second fluid chamber 6 on the one hand, and the third fluid chamber 7 on the other, via the access opening 16 connected to the through-channel 15. Fluid 12 can flow between the through-channel 15 and the second fluid line 11. As described, the second fluid line 11 is designed as a capillary section 13, allowing fluid 12 to rise vertically from the through-channel 15 into the second fluid line 11 and from there into the third fluid chamber 7.

[0063] The control body 14 with the through-channel 15 and the access opening 16 represents a favorable solution. However, according to the invention, it is also conceivable that the control body 14 is omitted or that the control body 14 has no through-channel 15 and no access opening 16, wherein a narrow gap is provided between the first fluid line 10 and the control body 14 for fluid transport between the first fluid chamber 5 and the second fluid chamber 6 on the one hand, and the second fluid line 11 or the third fluid chamber 7 on the other.

[0064] Fig. 5 discloses a schematic outline of an exemplary fourth embodiment of a fluidic coupling device according to the invention.

[0065] This exemplary fourth embodiment corresponds structurally to that exemplary third embodiment of a fluidic coupling device according to the invention, which is described in Fig. 4 as shown. Therefore, in Fig. 5 the same reference symbols as in Fig. 4 used.

[0066] The coupling device comprises a coupling element body 9, a first fluid chamber 5, a second fluid chamber 6, a third fluid chamber 7, a first fluid line 10, a second fluid line 11, a control body 14 guided in the first fluid line 10 with a through channel 15, a first elastomer stop 22 and a second elastomer stop 23.

[0067] While in Fig. 4 A first control state of the first fluid chamber 5 and the second fluid chamber 6, unloaded by coupling forces, is shown, in which a fluidic connection between the second fluid line 11 and the through channel 15 is formed via an access opening 16 of the control body 14. Fig. 5 a second control state.

[0068] In this second control state, the first elastomer stop 22 is subjected to coupling forces, which reduces the size of the first fluid chamber 5 compared to the first control state. Due to the flow of fluid 12 from the first fluid chamber 5 through the passage 15 into the second fluid chamber 6, the fluid pressure in the second fluid chamber 6 increases and loads it. The second fluid chamber 6 is thus indirectly loaded by the coupling forces and is consequently enlarged relative to the second elastomer stop 23.

[0069] Due to the flow or a change in fluid pressure conditions, the control element 14 is moved from a neutral position, which is in Fig. 4 As shown, the fluid is displaced in the first fluid line 10 towards the second fluid chamber 6. This creates a fluidic connection between the second fluid line 11 and the through-channel 15, as exemplified in Fig. 4 As shown, the second fluid line 11 and the access opening 16 are blocked by an offset. Such a blocked state, in which the fluid 12 cannot flow between the third fluid chamber 7 and the passage channel 15, is shown in Fig. 5 revealed.

[0070] Fig. 6 Disclosing a schematic elevation of a section of an exemplary embodiment of a chassis of a rail vehicle according to the invention, with a fluidic coupling device according to the invention designed as a first wheelset guidance device.

[0071] The chassis has a chassis frame 3, which includes the first wheelset guide device, a first swing arm 2, a first wheelset bearing housing 26, and a Fig. 6 The first wheelset bearing, which is not visible, is connected to a first wheelset 1 of the chassis. A first primary spring 27 is also arranged between the first wheelset bearing housing 26 and the chassis frame 3.

[0072] The chassis frame 3 is connected to the first wheelset 1 and to a Fig. 6 second wheelset not shown over in Fig. 6 three further wheelset guide devices, three further swing arms, three further wheelset bearing housings, three further wheelset bearings and three further primary springs not visible or shown are connected.

[0073] The first wheelset guide device has a wheelset guide bushing 28 and a wheelset guide pin 29, which are structurally equivalent to the bushing 4 and pin 8 described in Fig. 1, Fig. 2 and Fig. 3 are shown. One example in Fig. 1 The visible first fluid line 10 is connected via a fluid connection 30 and a connecting line 31 to a fluid reservoir 32 connected to the chassis frame 3. The first wheelset guide device can be supplied with a fluid 12 from the fluid reservoir 32, as exemplified in Fig. 4 and Fig. 5 As shown, the system is supplied with fluid, and active adjustment of fluid pressure conditions in the first wheelset guidance device is possible. This allows the first wheelset guidance device not only to passively guide the first wheelset 1, but also to actively adjust the steering angle of the first wheelset 1.

[0074] According to the invention, it is also conceivable that the chassis does not have wheelsets in the actual sense, but pairs of wheels (individual wheels or loose wheelsets) and that the coupling device is used as a wheel guidance device with a wheel guide bushing and a wheel guide pin. List of designations

[0075] 1 First wheelset 2 First swing arm 3 Chassis frame 4 Bushing 5 First fluid chamber 6 Second fluid chamber 7 Third fluid chamber 8 Bolt 9 Coupling element body 10 First fluid line 11 Second fluid line 12 Fluid 13 Capillary section 14 Control body 15 Through channel 16 Access opening 17 Opening 18 Closure 19 Transport locking screw 20 Through opening 21 Limiting surface 22 First elastomer stop 23 Second elastomer stop 24 First end section 25 Second end section 26 First wheelset bearing housing 27 First primary spring 28 Wheelset guide bushing 29 Wheelset guide bolt 30 Fluid connection 31 Connection line 32 Fluid reservoir r Radius σ Surface tension θ Contact angle ρ Density g Gravitational acceleration l Length

Claims

1. Fluidic coupling device for coupling components, in particular for a chassis for a rail vehicle, having a resizable first fluid chamber (5), a resizable second fluid chamber (6) and a first fluid line (10), which connects the first fluid chamber (5) to the second fluid chamber (6), wherein the first fluid chamber (5) and the second fluid chamber (6) can be supplied with fluid (12) for the purpose of adjusting coupling stiffnesses of the coupling device, wherein a third fluid chamber (7) is connected to the first fluid line (10) by way of a second fluid line (11), wherein the second fluid line (11) is arranged as a single fluid line for conveying fluid (12) into the third fluid chamber (7) and out of the third fluid chamber (7) and has a smaller cross-section than the first fluid line (10) at least in a capillary segment (13), characterised in that a control body (14) with a through channel (15) aligned parallel or approximately parallel to the first fluid line (10) and an access opening (16) connected to the through channel (15) is arranged in a moveable manner in the first fluid line (10) and in a first control state, unloaded of coupling forces, of the first fluid chamber (5) and the second fluid chamber (6), a fluid connection is formed by way of the access opening (16) between the second fluid line (11) and the through channel (15), or that the control body (14) is arranged movably in the first fluid line (10) and a distance for a fluid transportation is provided between the first fluid line (10) and the control body (14).

2. Fluidic coupling device according to claim 1, characterised in that the at least one capillary segment (13) is embodied as a cylindrical capillary flow channel.

3. Fluidic coupling device according to claim 1 or 2, characterised in that the at least one capillary segment (13) is realised so as to extend across an overall line length of the second fluid line (11).

4. Fluidic coupling device according to claim 1, characterised in that the at least one capillary segment (13) is embodied as a diaphragm with a slot or a gap.

5. Fluidic coupling device according to one of claims 1 to 4, characterised in that a cross-sectional size of the at least one capillary segment (13) is formed from a surface tension (σ) of a fluid (12) which can be introduced into the at least one capillary segment (13), from a contact angle (θ) between the at least one capillary segment (13) and the fluid (12), from a density (ρ) of the fluid (12), from the acceleration of gravity (g) and from a length (1) of the at least one capillary segment (13).

6. Fluidic coupling device according to one of claims 1 to 5, characterised in that the second fluid line (11) is aligned vertically or approximately vertically.

7. Fluidic coupling device according to one of claims 1 to 6, characterised in that in a second control state, loaded by coupling forces, of the first fluid chamber (5) and the second fluid chamber (6), the fluidic connection between the second fluid line (11) and the through channel (15) is locked by an offset between the second fluid line (11) and the access opening (16).

8. Fluidic coupling device according to one of claims 1 to 7, characterised in that the third fluid chamber (7) has an opening (17) to an exterior of the coupling device, which is sealed by means of a gas-tight and fluid-tight closure (18).

9. Fluidic coupling device according to one of claims 1 to 8, characterised in that a transport safety screw (19) is inserted into a coupling element body (9) of the coupling device, in which the third fluid chamber (7), the first fluid line (10) and the second fluid line (11) are arranged, said transport safety screw (19) having a through opening (20), which, in a tightened first safe state of the transport safety screw (19), is embodied as a line part of the second fluid line (11).

10. Fluidic coupling device according to claim 9, characterised in that in a released, second safe state of the transport safety screw (19), the second fluid line (11) is interrupted by the transport safety screw (19), wherein the transport safety screw (19) in the second safe state projects beyond a boundary surface (21) of the coupling element body (9).

11. Fluidic coupling device according to one of claims 1 to 10, characterised in that the fluidic coupling device has a core and a sleeve at least partially encasing the core, in which sleeve the first fluid chamber (5), the second fluid chamber (6), the third fluid chamber (7), the first fluid line (10) and the second fluid line (11) are arranged.

12. Fluidic coupling device according to one of claims 1 to 11, characterised in that the first fluid chamber (5) and the second fluid chamber (6) are arranged in a connector (4) and the first fluid line (10), the second fluid line (11) and the third fluid chamber (7) are arranged in a bolt (8), wherein the bolt (8) is inserted into the connector (4).

13. Chassis for a rail vehicle having at least one fluidic coupling device according to one of claims 1 to 12.

14. Chassis according to claim 13, characterised in that the at least one fluid coupling device is a wheel guide device or a first wheelset guide device with a wheel guide connector or wheelset guiding connector (28) and a wheel guide bolt or wheelset guide bolt (29).

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