CZ301757B6 - Device to drive rail vehicle wheel set when machining running profiles thereof - Google Patents

Abstract

In the present invention, there is disclosed a device intended for driving a set of wheels of railway vehicles when machining their running profiles wherein the wheel set wheels (K) are provided on inner side of a rim and outside of the wheel set with a cylindrical surface (V) and an axle box (S).The device is formed by a box (2) coupled with a frame (1). In the box (2), there are rotatably mounted at least two axles provided outside the box with pulleys (3) that can be pressed to the cylindrical surface (V). Opposite end of the box (2) is provided with a hydraulic cylinder (4) that can be pressed to the axle box (S). At least one of the pulleys (3) is coupled with a torque source (5).

Description

Equipment for driving wheel sets of rail vehicles during machining of their driving profiles

Technical field

The invention is a device for driving a wheel set of rail vehicles in machining their driving profiles, wherein the wheels of the wheelset are provided on the inside of the rim with a cylindrical surface and a bearing box on the outside of the wheelset.

BACKGROUND OF THE INVENTION

There is no problem in deriving a rotating motion when working out the unset wheelsets. It can be used for turning conventional jigs used on lathes when turning longer objects. The wheelset can be gripped in the spikes or chuck jaws as described in the CC patent

278919. When machining unbalanced wheelsets, there is a problem how to derive a rotational movement of the wheelset whose torque would be sufficient for machining the driving profile. Therefore, it is common to use radical pulleys on which the wheelset is mounted. These radical pulleys are driven in this case. In the case of unbalanced wheelsets, the thrust of the wheel circumference is radically secured 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 exert a force on the bogie from above to achieve the necessary adhesion between the radical pulleys 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 depends on the resistance generated by the machining process. Even so, due to the accompanying machining phenomena such as lubrication and cooling, adhesion varies. Driven by radical pulleys is therefore inappropriate.

The below-level lathe described in CZ patent 288116 consists of pairs of pulleys intended to drive each of the wheelsets. At least one of the pulleys is driven. Between the pulleys is a foldable wheel set which is seated on the supporting pulleys. 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. There are two pairs of support rollers on the sides of the pulley boxes. Each of the support rollers is mounted in the lifting mechanism itself, which guarantees a fixed position of the axle of the two 35-inch wheels during machining. On such a device it is possible to process the wheel profiles of wheelsets and low-floor vehicles, 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 from the vehicle. Despite the marked progressiveness of the concept of such an under-lathe solution, the drive by means of pairs of pulleys shows some undesirable force effects. A condition for trouble-free transmission of circumferential force from the pulleys to the wheelset wheels is the exact positioning of the pulley on the wheel. By rotating the wheel of the wheelset by a pulley, the contact point of the pulley on the side of the wheel describes an imaginary circle. In order for the circumferential force of the pulley to fully effect the rotation of the wheelset, the contact point of the pulley with the side of the wheel must 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. The different position of the contact point of the pulley with the wheel side of the wheelset from the tangent point is not caused only by the driving force of the pulley, but by the force distribution. The resultant force dissipation creates a component lying in a radical leading from the wheel axis to the contact point of the pulley with the wheel side. According to sense the force vector, either ^{in a} wheelset discharged from the support rollers or support rollers excessively overloaded. One reason is manufacturing inaccuracies, to which wear clearances are added. Another reason is the incorrect geometry of the carriage under contact of the wheel profile with the support rollers. The running profile does not always have a circle geometry, as it is unevenly worn both by rolling and braking from contact with the rail head. 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 side of the wheel, which is not definable and cannot be corrected in any way.

-1GB 301757 B6

The essence of the solution

The device according to the invention is intended for driving a wheel set of rail vehicles during machining of their profiles. It is intended for wheelsets of wheelsets, which are on the inner side of the rim equipped with a cylindrical surface and bearing housing on the outer side of the wheelset. The device according to the invention is formed by a casing connected by a frame, in which at least two support shafts are provided rotatably provided with rollers pressed against the cylindrical surface outside the casing. The opposite end of the housing is provided with a hydraulic cylinder which can be pressed against the bearing housing of the wheelset. At least one of the pulleys is connected to a torque source. Such a designed wheel drive does not create any undesired force effects that would adversely affect the machining of wheel profiles. By utilizing the cylindrical surface on the inner side of the rim to drive the wheelset, the machined surface of the driving profile is also made available only for the cutting tool.

The support shafts of the pulleys are provided with gears, to which a common pinion, whose shaft is connected to a source of torque common to both pulleys, is adjacent. The torque source is distant from the housing and may be more bulky and therefore suitable for greater cutting resistances .20 In another embodiment, the housing is coupled by a shaft through a shaft that acts as a bracket connecting the housing to the frame. The pulleys are directly provided with torque sources, for example hydraulic motors. Such a device is easily replaceable by simply removing the bracket from the frame, for example in the event of a failure.

Description of the drawings

Fig. 1 shows a front view of the device according to the invention between the cylindrical surface and the bearing housing, Fig. 3 shows a cross-section of the housing with a common pinion for both gears and Fig. 3 shows a cross-section of the housing.

Exemplary embodiment

The gear wheel K of the wheelset has a cylindrical surface V and a bearing box S on the inside of the rim on the outside of the wheelset. The device according to the invention consists of a box 2 connected to the frame k The box 2 has rotatably mounted at least two support shafts. The opposite end of the housing 2 is provided with a hydraulic cylinder 4 which can be pressed against the bearing housing S. At least one of the rollers 3 is connected to a source of torque.

5. In one embodiment shown in FIG. 2, the axle shafts 3 are provided with gear wheels 31 adjoining a common pinion 32 whose shaft 33 is connected to a torque source 5, not shown. In the second embodiment shown in Fig. 3, the housing 2 is connected to the frame 1 by means of a shaft 33 and the pulleys 3 are directly connected to the source of torque 5.

After the wheelset has been set up between the machine tool spindles, for example between its spikes, the housing 2 is pulled over the cylindrical surface V on the inside of the wheel rim K. The hydraulic cylinder 4 is then inclined to the bearing housing S. By pressurizing the hydraulic cylinder 4 between the cylindrical surface V and the bearing housing S and the pulley 3 is pressed against the cylindrical surface V. By actuating the torque source 5 in a rotational motion, in one case shown in Fig. 2, the torque is transmitted to the gears 31 via the pinion 32. 3, the torque from the torque source 5 is transmitted directly to the roller 3.

Claims (3)

PATENT CLAIMS 5 1. Apparatus for driving a wheel set of rail vehicles in the machining of their driving profiles, wherein the wheels (K) of the wheelset are provided on the inside of a rim with a cylindrical surface (V) and a bearing housing (S) on the outside of the wheelset. a housing (2) connected to the frame (1), in which at least two support shafts are provided rotatably provided outside the housing (2) with rollers (3) pressed against a cylindrical surface (V), the opposite end of the housing (2) being provided with a hydraulic cylinder 10 (4) compressible to the bearing housing (S), wherein at least one of the rollers (3) is connected to a source of torque (5). The wheel set according to claim 1, characterized in that the axle shafts (3) are provided with toothed wheels (31) adjoining a common pinion (32), the shaft (33) of which is connected to a torque source. (5). The wheel set according to claim 1, characterized in that the housing (2) is connected to the frame (1) by means of a shaft (33).