Devices for increasing the coefficient of adhesion in rail vehicles

Abstract

The present invention relates to a device for improving the adhesion coefficient of a rail vehicle. The device comprises a rail vehicle wheel, a cleaning device, and a rail on which the rail vehicle travels. The rail vehicle wheel is coupled to the cleaning device so that the cleaning device acts on the wheel when required. The cleaning device is arranged and designed to at least reduce moisture adhering to the wheel rolling surface before the wheel rolling surface contacts the rail, thereby improving the adhesion coefficient in the contact area between the wheel rolling surface and the rail.

Description

Technical Field

[0001] The invention relates to a device for improving the adhesion coefficient between the wheels of a rail vehicle and the rails on which the rail vehicle travels. Background Art

[0002] The coefficient of adhesion is understood to be the ratio between the transmittable tangential force and the normal force.

[0003] In the context of rail vehicles, a tangential force is understood to be a transmittable driving force which acts on the outer circumference of a rail vehicle wheel and drives or brakes the rail vehicle wheel in the longitudinal direction of the rail vehicle.

[0004] In a rail vehicle, the normal force is the force exerted by the wheels of the rail vehicle on the rails on which the rail vehicle travels. The normal force is generated by the weight of the rail vehicle.

[0005] The coefficient of adhesion is important for the traction or braking force of a rail vehicle.

[0006] It is known to perform measures on the rails, also referred to as rail treatments, in order to improve the traction or braking force of rail vehicles.

[0007] WO 2019-219223 A1 discloses using a measuring unit to determine the lateral displacement of a rail on which a rail vehicle is traveling relative to the area of ​​action of a rail treatment unit. The rail treatment unit is used to apply an auxiliary medium (sand, water, air) to the traveling rail, thereby increasing the adhesion coefficient between the rail and the wheels of the rail vehicle. These measures have the beneficial effect of reducing slip between the wheels and the rail or track and increasing the transferable braking and traction forces.

[0008] DE 23 00 046 A1 discloses the chemical composition of an adhesion promoter for rail vehicles.

[0009] A system for restoring the roadholding of a freight vehicle having disk brakes is known from document CN 109 664 914 A.

[0010] A locomotive running surface cleaning control device is known from document CN 107 031 668A. Summary of the Invention

[0011] The technical problem to be solved by the present invention is to provide a device by which the traction or braking force of a rail vehicle can be further improved.

[0012] According to the invention, this object is achieved by a device for increasing the coefficient of adhesion in a rail vehicle.

[0013] The present invention relates to a device for improving the adhesion coefficient of a rail vehicle. The device comprises a rail vehicle wheel, a cleaning device, and a rail on which the rail vehicle travels. The rail vehicle wheel is coupled to the cleaning device so that the cleaning device acts on the wheel when required. The cleaning device is arranged and designed to at least reduce moisture adhering to the wheel rolling surface before the wheel rolling surface contacts the rail. This improves the adhesion coefficient in the contact area between the wheel rolling surface and the rail.

[0014] In an advantageous development, the cleaning device is arranged and designed to remove moisture adhering to the wheel running surface by drying.

[0015] In an advantageous development, the cleaning device is arranged and designed to reduce or remove dirt adhering to the wheel running surface.

[0016] In an advantageous development, the cleaning device has at least one compressed air outlet, through which compressed air is directed toward the wheel or the wheel running surface.

[0017] In an advantageous development, the outlet opening is arranged at the level of the wheel axis.

[0018] In a further development which is no longer claimed, the cleaning device is designed as a mechanical cleaning system which acts on the wheel running surface.

[0019] In a further development which is no longer claimed, the mechanical cleaning system comprises a cleaning pad or a cleaning brush which is movably mounted so as to be pressed against the wheel running surface via a coupling system when necessary.

[0020] The friction forces generated thereby cause the wheel to heat up, which results in additional drying of the wheel.

[0021] In a further development, which is no longer claimed, the coupling system is designed as a pneumatic system.

[0022] In an advantageous development, the cleaning device is coupled to a rail treatment unit which applies an auxiliary medium, preferably sand or air, to the rail in order to additionally increase the adhesion coefficient.

[0023] In a preferred embodiment, the compressed air is passed through a heating device before being discharged through the compressed air outlet. The heating device is designed to heat the compressed air so that the heated compressed air discharged through the compressed air outlet additionally dries the wheel running surface or the wheel.

[0024] In a preferred development, the heating device is arranged between the compressed air generator and the compressed air outlet, so that the compressed air reaches the heating device as a compressed air flow.

[0025] In a preferred development, the heating device is arranged and designed such that it surrounds the compressed air flow.

[0026] In a preferred development, the heating device is designed as a heatable tube or copper tube, through which the compressed air volume flow is passed for heating.

[0027] In a preferred development, the heating device is arranged and designed in such a way that a compressed air volume flow flows around it.

[0028] In a preferred development, the heating device is designed as a heating wire which is arranged in the compressed air volume flow in order to heat it.

[0029] In a preferred development, the heating device is designed as a heat exchanger which transfers heat from the fluid to the compressed air volume flow.

[0030] In a preferred development, the fluid for inputting heat is transformer oil, which is used in a transformer cooling circuit of a rail vehicle to dissipate heat from the transformer.

[0031] In a preferred development, the fluid for inputting heat is engine cooling water, which is used in an engine cooling circuit of the rail vehicle to dissipate heat from the engine.

[0032] The present invention enables the wheels of rail vehicles to be dried or cleaned.

[0033] In a preferred embodiment, it was recognized that even when the rails are clean or dry, a delay may occur in the generation of traction or braking force. This delay is caused by the wheels of the rail vehicle, and the present invention is based on this.

[0034] If the rolling circle of the wheel changes while the wheel rolls on the rail, the invention also immediately starts to increase the traction or braking force.

[0035] If the rolling circle of the wheel as a whole is not dry or not dry enough, the present invention immediately starts to increase the traction or braking force.

[0036] When there is residual lubricating fluid from the rim lubrication system on the wheel, the invention immediately starts to increase the traction or braking force.

[0037] The present invention achieves both an increase in traction and an improvement in braking effect in a rail vehicle.

[0038] By means of an advantageous arrangement of the compressed air outlet, compressed air for drying or cleaning the wheel can be saved, while at the same time the cleaning or drying effect on the wheel is maintained or intensified.

[0039] Due to the advantageous arrangement of the compressed air outlet, the special profile of the wheel with the conical running surface and the wheel rim is used in order to effectively remove water and dirt from the wheel.

[0040] By using the cleaning device in combination with the rail treatment unit, traction and braking forces can be improved quickly. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The present invention will be described in detail below by way of example with reference to the accompanying drawings. In the drawings:

[0042] Figure 1 The first design of the present invention is shown, and

[0043] Figure 2 A second embodiment is shown which is no longer claimed. DETAILED DESCRIPTION

[0044] Figure 1 A first embodiment of the present invention is shown with reference to a running gear FW of a rail vehicle.

[0045] The running gear FW comprises a frame 1 to which a wheel set with wheels 3 is fastened.

[0046] The wheel 3 is in contact with the rail 2 in a local area, the contact area BU.

[0047] Two compressed air outlets 4 are directed toward the wheels 3 , through which the compressed air DL reaches the wheel running surfaces RLF.

[0048] These components realize the cleaning device.

[0049] The two compressed air outlets 4 are arranged opposite one another with respect to the wheel diameter or at the height of the wheel axis, so that they act on the wheel running surface RLF from both sides.

[0050] The two compressed air outlets 4 remove moisture or dirt from the wheels 3 or dry the wheels 3 at the wheel rolling surface RLF and thus the contact patch BU in order to improve traction or braking force.

[0051] Figure 2 A second embodiment of a running gear FW of a rail vehicle, which is no longer claimed, is shown.

[0052] The running gear FW comprises a frame 1 to which a wheel set with wheels 3 is fastened.

[0053] The wheel 3 is in contact with the rail 2 in a local area, the contact area BU.

[0054] The mechanical cleaning system 5 is pressed, if necessary, against the wheel running surface RLF, for example, by means of a pneumatic system 6 , in order to dry out moisture from said wheel running surface or to clean said wheel running surface.

[0055] These components realize the cleaning device.

[0056] The mechanical cleaning system 5 comprises a cleaning pad or a cleaning brush which acts on the wheel 3 for cleaning or drying.

[0057] The friction forces generated thereby cause the wheel 3 to be heated, which results in additional drying of the wheel 3 .

Claims

1. A device for improving the adhesion coefficient in a rail vehicle, - the device comprises a rail vehicle wheel, a cleaning device and a rail on which the rail vehicle travels, -in, The wheels of the rail vehicle are coupled to the cleaning device so that the cleaning device acts on the wheels when necessary. wherein the cleaning device is arranged and designed to at least reduce moisture adhering to the wheel running surface before the wheel running surface contacts the rail, - thereby improving the adhesion coefficient in the contact area between the wheel rolling surface and the rail, wherein the cleaning device has two compressed air outlets, through which the compressed air is directed toward the wheel rolling surface, - wherein the compressed air outlet is arranged at the height of the wheel axis, The two compressed air outlets are arranged opposite one another at the height of the wheel axis with respect to the wheel diameter, so that they act on the wheel running surface from both sides.

2. The device according to claim 1, wherein The cleaning device is arranged and designed to remove moisture adhering to the wheel running surface by drying.

3. The device according to claim 1, wherein The cleaning device is arranged and designed to reduce or remove dirt adhering to the rolling surface of the wheel.

4. The device according to claim 1, - wherein the cleaning device is coupled to a track processing unit, -in, The rail treatment unit applies an auxiliary agent to the rail in order to additionally increase the coefficient of adhesion.

5. The device according to claim 4, wherein The auxiliary medium is sand or air.

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