CZ2007419A3 - Device to drive disengaged or engaged rail vehicle wheel sets - Google Patents

Abstract

The wheelset drive device of the rolling stock consists of a pair of rollers (3), at least one of which is driven. A wheel (K) of the wheelset is insertable between the pulleys (3). Each of the rollers (3) is rotatably mounted in a separate spindle (2) and provided with a torque source (4). The spindles (2) are articulated to the support (5) connected to the frame (1). The spindles (2) have an extension device (6) inserted on opposite sides of the pulleys (3).

Description

Technical field

The present invention provides a device for driving wheelsets of rail vehicles not tied or unlinked from a sub-chassis, particularly in machining their driving profiles. The assembly a consists of a pair of pulleys, at least one of which is driven and between which an intermediate wheel of the wheelset is inserted. Every /. the pulleys are rotatably mounted in a separate spindle and provided with a source of torque.

BACKGROUND OF THE INVENTION

When working out tied wheelsets, it is not a problem to generate a rotary motion. Can be used when turning! conventional fixtures used on lathes for turning longer objects. The wheelset can be gripped in the spikes or chuck jaws as described in CZ patent No. 278919. When machining unbalanced wheelsets, there is a problem of how to derive the rotational movement of the wheelset. whose torque would be sufficient for machining the driving profile. Therefore, it is common to use radial pulleys on which the wheelset is mounted. These radial rollers are driven in this case. In the case of unbalanced wheelsets, the thrust of the wheel circumference to the radial is ensured by the weight of the vehicle, which is sufficient, in particular for traction vehicles. If the machined wheelset is from a tethered bogie, then it is necessary to apply a thrust from the top of the bogie to achieve the necessary adhesion between the radial rollers and the wheel profiles. If the wheelset is tied but provided with bearing housings at the ends, it is possible to apply pressure to the bearing housings to ensure adhesion. The amount of adhesion required is dependent on the resistance generated by the machining process. Even so, due to the accompanying machining phenomena, such as lubrication and cooling, the adhesion varies. The drive of the radial rollers therefore seems unsuitable.

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The solution described in CZ patent No. 288111 is known, consisting of a pair of pulleys, at least one of which is driven, and a twin insertable between them. The pulleys are arranged in housings, where a thrust device is arranged between the housings and the frame. The tool holder protrudes against the driving profile. On both sides of the tool are pairs of support rollers. Each of the support rollers is mounted in a separate lifting device. In this solution too, the wheelset rests on the rollers. Such a solution then follows the circumferential irregularities of the worn driving profile and transmits its circumferential radial irregularities to the machined driving profile.

Both solutions result. that the circumference of the machined wheels is non-circular and this does not preclude the wear of the wheel before machining.

The below-level lathe described in CZ patent No. 288111 consists of a pair of pulleys intended to drive each of the wheelsets. At least one of the pulleys is driven. Between the rollers there is an insertable wheel of the wheelset, which is seated on the supporting rollers. The housing of one of the pulleys is fixed. A pressing device is arranged between the boxes of the other pulleys and the frame. The tool holder protrudes under the rollers against the driving profile. On the sides of the pulley boxes is a pair of support rollers. Each of the support rollers is mounted in a separate lifting gear, which guarantees a fixed position of the wheelset axis during machining. On such a device, the driving profiles of wheelsets of wheelsets and low-floor vehicles can be worked even if the wheels are located inside the frame and the fronts are fitted with bearing houses, without the condition of unloading the bogies or even wheelsets / vehicles. Despite the considerable progressiveness of the concept of such an under-lathe solution, the drive by means of a pair of pulleys shows some undesirable force effects. A condition for trouble-free transmission of circumferential force from the pulleys to the wheelsets of the wheelset is the precise positioning of the pulley on the side of the wheel. By turning the wheel of the wheelset by a pulley, the contact point of the pulley on the side of the wheel describes an imaginary circle. .For the circumferential force of the beam to act entirely on the rotation of the wheelset, the contact point of the pulley with the side of the wheel shall be at the point of contact of the imaginary circle with the tangent lying in a plane passing through the circumference of the pulley. This is rarely the case for several reasons. Due to the different position of the contact point of the pulley with the wheel side of the wheel set from the tangent point, the driving force of the pulley does not only act on its drive, but forces are dissipated. The resultant force distribution creates a component lying in the radial, which is directed from the wheel axis to the contact point of the pulley with the wheel side. Depending on the force vector, the wheelset either carries the support rollers or the support rollers overload excessively. If it were to be mounted and mounted in the spikes, such a bearing would also be excessively stressed. One of the reasons are manufacturing inaccuracies, to which are added also the wear caused by wear. Another reason is the incorrect geometry of the chassis contact of the wheel profile with the support rollers. The driving spill does not always have the geometry of the circle, as it is unevenly worn from rolling contact by rolling head. so from braking. Therefore, due to different wear, it exhibits geometric inaccuracies and its circumference is not circular. All these influences create a deviation of the contact point of the pulley with the wheel side. which is not definable and cannot be corrected in any way.

The essence of the solution

The device according to the invention solves the propulsion of two wheelsets of rail vehicles not tied or tied from the chassis, which is especially intended for machining their driving profiles. It consists of a pair of pulleys, at least one of which is driven and between which an insertable wheel of a wheel set is inserted. Each of the rollers is rotatably mounted in a separate spindle and provided with a source of torque. The spindles are articulated to a carrier connected to the frame. The spindles have an expanding device on opposite sides of the rollers. The pulleys follow the lateral deviations of the rotating wheelset as a result of the articulation to the carrier which allows tilting, ´ * · J ·· «· · *« ·

In one solution, the stretching device is formed by a hydraulic cylinder and in another embodiment by a screw connection.

To correctly position the pulleys on the sides so that the axes of the spindles point to the center of rotation of the wheelset, thereby avoiding undesired radial forces, and the force from the pulleys was only tangential to the rim, the carrier is tilted relative to the frame. A tilting device is inserted between the carrier and the frame.

This design allows machining of unbalanced wheelsets of rail vehicles from the chassis. As a result of minimizing or eliminating undesirable force effects, both side forces. If the two spindles are compensated by lateral tilting, as well as the radial force effects which are eliminated by the tilting mechanism, the wheelsets can be set in the centers during machining. For this purpose, the ends of the wheelset axles are provided with dimples. If the bearing boxes are at the ends of the axes. then the pits at the ends of the axes can be accessed by removing the bearing housing cover. In some bearing housings, the covers are already provided with centering pockets and there is no need to remove the covers from the bearing housing.

Image description

A general view of the device according to the invention, where a work wheel is clamped between the rollers, is shown in the accompanying drawing.

Description of an exemplary embodiment

The device according to the invention consists of a pair of pulleys 3 of which at least one pulley 3 is driven. Between the rollers 3 is an insertable wheel K of the wheelset. Each of the rollers 3 is rotatably mounted in a separate spindle 2 and provided with a source of torque 4. The spindles 2 are articulated to the carrier 5 by means of pins 5C.

The carrier 5 is connected to the frame 1. The spindles 2 have opposite sides on opposite sides

An expansion device 6, which can be a hydraulic cylinder or a screw connection, is inserted into the rollers 3. The carrier 5 is tiltable with respect to the frame, and a tilting device 7 is inserted between the carrier 5 and the frame 1 for this purpose.

in this case, it consists of a worm gear.

The wheelset is positioned between the machine tool spindles. Since the axles of the wheelsets are provided with dimples which have been used in the production during machining, the dimples are used for clamping and the axis is also positioned between the spikes with which the spindles are provided, and the wheel k is subsequently in the bearing between the pulleys. 6, the spindles 2 are tilted around the pins 51 and the pulleys 5 approach each other, thereby gripping the wheel k. It is now necessary to tilt the pair of spindles 2 by means of the tilting device 7 by turning the worm in the worm wheel. The two drawbar spindles 2 are tilted. that the imaginary axis of the spindles 3 and thereby of the pulleys 3 of course intersect the axle of the wheelset exactly in its center. This eliminates the radial force effect on the wheelset, which would unnecessarily stress the contact between the wheelset and the spikes. The force acting from the contact of the pulleys 3 with the wheels k is only tangential, the pulleys 3 rotate under the influence of torque sources 4. The sense of rotation of the pair of pulleys 3 is obviously the opposite. As a source of torque 4 has proven hvdromotor.

Claims (4)

Patent Claim 1. An apparatus for propulsion of wheelsets of rolling stock not derailed or derailed from a bogie, in particular for machining their driving profiles, consisting of a pair of rollers (3). of which, at least one is driven and between which there is two wheels in the loadable wheel (K). wherein each of the rollers (3) is rotatably mounted in a separate spindle (2) and provided with a source of torque (4), characterized therein. wherein the spindles (2) are articulated to a support (5) connected to the frame (11), wherein the spindles (2) have an extending device (6) inserted on opposite sides to the rollers (3). The wheel set according to claim 1, characterized in that the expander (6) is formed by a hydraulic cylinder. A wheel set according to claim 1, characterized in that the expansion device (bi is formed by a screw connection). The wheel set according to claim 1, characterized in that the support (5) is tiltable relative to the frame (11) and a tilting device (7) is inserted between the support (5) and the frame (1).