AU2008328358A1

AU2008328358A1 - Underfloor wheelset lathe

Info

Publication number: AU2008328358A1
Application number: AU2008328358A
Authority: AU
Inventors: Tomas Konarek; Hans-Joachim Reiche
Original assignee: Hegenscheidt MFD GmbH and Co KG
Current assignee: Hegenscheidt MFD GmbH and Co KG
Priority date: 2007-11-24
Filing date: 2008-11-21
Publication date: 2009-05-28
Also published as: WO2009065400A1; CN101932398A; DE202008009409U1; WO2009065400A8; DE202007016469U1; EP2214854A1

Description

Underfloor wheelset lathe The invention concerns an underfloor wheelset lathe to machine the relevant profile of wheels and brake discs of wheelsets for train carriages with the aid of 5 tools, while the wheelset is mounted in axial bearing housings rotatably about its axis of rotation. The underfloor wheelset lathe has clamping members to engage the axial bearing housings of the wheelset, one of each said bearing housings being provided in a lathe frame on each end of the frame bed of the underfloor wheelset lathe as well as two drive rollers each, which form a pair of rollers, for 10 each of the two wheels of the wheelset to lift, drive and lower the wheelset before, during and after machining. The reason for this application is an underfloor wheelset lathe, disclosed in the German published patent application DE 10 2005 001 220 Al. The known 15 underfloor wheelset lathe is characterised by a particularly low overall height, this making it suitable to be used in existing working pits. The low overall height of the known underfloor wheelset lathe requires a drive, correspondingly matching it. A drive for an underfloor wheelset lathe with low overall height is also known from 20 the utility model DE 20 2007 016 469 U1 with the designation of "Underfloor wheelset lathe" by the same applicant; the utility model was registered on 13.3.2008. In contrast to this the object of this invention is to further improve the known drive 25 and in particular to bring about a smaller stress of the components of the drive as well as of the tools and of the workpiece, i.e. the wheelset. According to the invention this objective is achieved by the features of the first patent claim. 30 A comparable driving device is known, for example, from the European patent EP 0 332 823 B1. Admittedly in this case one deals with a "Lathe to machine brake discs of a wheelset dismantled from a railbound vehicle". In the case of the known "lathe" one deals with a device to exclusively machine only brake discs of 2 wheelsets that had been dismantled from the railbound vehicle and conveyed to the machining underfloor. In the case of the known lathe there was no thought given regarding a low overall height of the driving components. 5 In the case of the underfloor wheelset lathe of this present invention roller carrier links are provided, at each end of which a drive roller is arranged to lift, drive and lower the wheelset. Four identical roller carrier links are altogether provided on the underfloor wheelset lathe. Each two drive rollers form a pair of rollers to engage one of the two wheels of a wheelset. Accordingly, two roller carrier links 10 are present opposing one another at each face end of the underfloor wheelset lathe. The following description is essentially limited to the illustration of a single roller carrier link and the interaction of two adjacent roller carrier links. Several approximately horizontal lifting cylinders are provided to bring the drive 15 rollers at the ends of the roller carrier links into the working position and then disengage them. For each wheel of a clamped wheelset a clamping element and two drive rollers are provided. This present invention also provides that the clamping elements to fasten the 20 wheelset on the axial bearing housings allow a horizontal movement of the wheelset that is within the range of 1 and 5 mm, preferably 2 to 3 mm. After the drive rollers have contacted the periphery of both wheels of the wheelset, be it the running surface or the wheel flange, the wheelset is vertically 25 lifted by a limited amount with the aid of the roller carrier links. By virtue of this the incoming rails, over which the train carriage rolls above the underfloor wheelset lathe, becomes free and can be removed, so that the machining tools of the underfloor wheelset lathe can reprofile the wheels or the brake discs of the wheelset. 30 A space-saving arrangement results due to the fact that the drive motor for the associated drive roller is provided on each roller carrier link. In addition to the drive motor the roller carrier link also has a reduction gearbox for the drive of the drive roller. All drive motors are synchronised with one another.

3 The free end of a first swivel lever is articulately joined via a first joint with an approximately horizontal lifting cylinder, while the lifting cylinder simultaneously engages a second lever that is pivotably mounted in a bearing in one of the two lathe frames of the underfloor wheelset lathe and in a rotationally prevented 5 manner is joined with the other second lever of the adjacent roller carrier link. The rotationally prevented joint is carried out by gearing, for example involute gearing. The gearing at the ends of both second levers concentrically surrounds its mounting in the lathe frame. A gearing, that extends no more than in a semi-circle on the circumference, is adequate in this case. 10 Due to the rotationally prevented joining of the two levers with one another a single horizontal lifting cylinder would be sufficient to move the two adjacent roller carrier links into and out from the working position. A second horizontal lifting cylinder, as provided in this present embodiment, advantageously reduces the 15 stress of the moving parts during their movement into the working position. The gearing synchronises the movements of the lifting cylinders in this case too. In the sense of a reduction of the stress of the swivel links of the swivel levers, drive rollers and the clamped wheelset, the swivel link is rotationally flexibly 20 fastened on the swivel lever. This fastening is affected by a torsion bar, that rotationally prevented is provided between the swivel lever and the swivel links. The rotationally prevented arrangement is achieved, for example, by splines, known per se. Due to the rotationally flexible fastening of the swivel link the contact pressure between the drive rollers and the wheelset can be equalised in 25 every phase of the operation. In the following the invention is described in detail on an embodiment. They show on a reduced scale in 30 Fig.1 - side view of an underfloor wheelset lathe, Fig.2 - a section along line Il-Il of Fig.1, 4 Fig.3 - a perspective view of a roller carrier link. Each drive roller 1 (Figs.2 and 3) of a pair of rollers is rotatably and driveably mounted on the free ends 21, 21' of a roller carrier link 12, 12'. The roller carrier 5 links 12, 12' comprise a swivel link 13, 13' and a first swivel lever 4, 4'. The swivel links 13, 13' and the first swivel link 4, 4' are firmly joined with one another on the first end 14, 14' of the swivel lever 4, 4'. The two adjacent swivel links 13, 13' are pivotably mounted about an axis of rotation A and B, respectively, in the lathe frame 10. The axes of rotation A and B extend at a radial distance 24 parallel with 10 the axes of rotation Z, Z' of the wheelset 22, 22', wherein the wheelset Z represents the workpiece with the greatest possible wheel diameter and the wheelset Z' the workpiece with the smallest possible wheel diameter which can be machined on the underfloor wheelset lathe 20. Corresponding to the wheel diameters 22, 22' the position of the swivel links 13, 13' for the machining of large 15 wheel diameters 22 is approximately horizontal, whereas for the machining of small wheel diameters 22' it assumes a position pointing slightly upward from the vertical that is illustrated by a broken line, as are the positions of the swivel links 13, 13', the swivel levers 4, 4', the lifting cylinders 5, 5', the second levers 34, 34' and the intermediate levers 36, 36'. 20 The two free ends 15, 15' of the swivel levers 4, 4' are articulately joined with an approximately horizontal lifting cylinder 5, 5' and the first joints 16, 16'. At the same time an intermediate link 36, 36' articulately engages the joints 16, 16'. At the other end the intermediate links 36, 36' are articulately joined via second 25 joints 37, 37' with the free external ends 35, 35' of a second lever 34, 34'. These second levers 34, 34' in turn are pivotably mounted adjacent in bearings 38, 38' in the lathe frame 10. The mountings 38, 38' are concentrically surrounded by a gear 39, 39', that are allocated to the two levers 34, 34'. Both gears 39, 39' engage one another (not illustrated) in a form-locking manner. 30 In the illustration of Fig.1 all roller carrier links 12, 12' and their lift drives 4, 4', 5, 5'; 16, 16'; 34, 34'; 36, 36' are shown in their respective working positions with solid and broken lines; the direct lifting and lowering of a wheelset Z, Z' to and 5 from the working position is not shown as they are obvious to the person skilled in the art. Each horizontal lifting cylinder 5, 5' initiates the movement in the relevant second 5 lever 34, 34' via a first joint 33, 33'. The second lever passes on the movement via the respective joints 37, 37', the intermediate lever 36, 36' and the first joint 16, 16' as well as the first swivel lever 4, 4' to the respective roller carrier link 12, 12', so that to vertically pivot the drive rollers 1, situated on their external ends 21, 21', into or out from their working position. 10 When pivoted into the working position, the drive rollers 1 engage the wheels 22 or 22' of the wheelset Z, Z'; it could be via their running surface (not illustrated) or wheel flange (not illustrated). The engagement of both drive rollers I with the wheelset 22, 22' is elastic with extensive equalisation of the contact pressure. 15 Each roller carrier link 12 is pivotably mounted in two places 42, 42' in the lathe frame 10 (Fig.1). A torque support (not illustrated) limits the pivoting angle of the roller carrier link 12. The roller carrier link 12 comprises the drive roller 1 and its mounting 43, 43' in a sleeve 44. Between the shaft 45 and the drive roller 1 and 20 its drive motor 3 a gearbox 2 is connected; only its housing 46 is illustrated in Fig.2. The housing 46 has cooling ribs 47 on its exterior. The sleeve 44 is fastened in a frame support 48. The frame support 48 and a second sleeve 50 are situated parallel to the sleeve 44 at a distance 49. As it can 25 be seen from the drawing, both sleeves 44 and 50 are basically cylindrical, although of different lengths. The axis of rotation A and B, respectively, passes through the centre 51 of the sleeve 50. Inside the sleeve 50 a torsion bar 40 is provided, that on a first end 52 is joined 30 with the sleeve 50 by means of splines 41 in a rotation preventive manner relative one another, while the second end 53 of the torsion bar 40 is rotatably guided in the sleeve 50. For the rotatable guiding of the torsion bar in the sleeve 50 a guide sleeve 54 is provided. In contrast to this, the swivel lever 4 is firmly joined with the torsion bar 40.

6 The path of the force in the roller carrier link 12 can be described as follows: the contact pressure of the drive roller 1 on the wheel 22 is produced by the lifting cylinder 5. The contact pressure transfers to the roller carrier link 12 via the intermediate lever 36, the swivel lever 4 and the swivel link 13. From the swivel 5 lever 4 the contact pressure is first conveyed to the torsion bar 40. The torsion bar 40 passes the contact pressure via the splines 41 on to the second sleeve 50. In turn the second sleeve 50 transmits the contact pressure to the drive roller 1 via the frame support 48 and the first sleeve 44 as well as the mounting 43. 10 The roller carrier link 12 comprises the swivel lever 4, the torsion bar 40, the sleeve 50, the frame support 48, the sleeve 44 and the drive roller 1 with its shaft 45 mounted therein. The gearbox housing 46 extends from the shaft 45 parallel with the frame support 48 in the direction of the swivel lever 4. Its position relative the motor 3 is similar, the motor extending from the gearbox housing 46 in the 15 direction of the sleeve 50 and parallel with it. A particularly space-saving arrangement is achieved by this. The arrangement as such, comprising the roller carrier link 12, the gearbox housing 46 and the motor 3, is described in the spirit of the invention as the swivel link 13.

7 List of reference numerals 1 Drive roller 50 Second sleeve 2 Reduction gearbox 51 Centre of second sleeve 3 Drive motor 52 First end 4, 4' Swivel lever 53 Second end 5, 5' Lifting cylinder 54 Guide sleeve 10 Lathe frame A Axis of rotation 12,12' Roller carrier link B Axis of rotation 13, 13'Swivel link C Axis of rotation 14, 14'First end of swivel lever (4, 4') 15, 15'Second end of swivel lever (4, 4') 16, 16'First joint 20 Underfloor wheelset lathe 21, 21'Free end of roller carrier link (12, 12') 22, 22'Wheelset 24 Radial distance 33, 33'First joint 34, 34'Second lever 35, 35'External end 36, 36'Intermediate lever 37, 37'Second joint 38, 38'Bearing 39, 39'Gearing 40 Torsion bar 41 Splines 42, 42'Bearing 43, 43'Bearing 44 Sleeve 45 Shaft of drive roller 46 Gearbox housing 47 Cooling ribs 48 Frame support 49 Distance

Claims

1. An underfloor wheelset lathe to machine the relevant profile of wheels and brake discs of wheelsets for train carriages with the aid of tools, while the 5 wheelset is mounted in axial bearing housings rotatably about its axis of rotation, with clamping members to engage the axial bearing housings of the wheelset, one of each said bearing housings being provided in a lathe frame on each end of the frame bed of the underfloor wheelset lathe, as well as two drive rollers each forming a pair of rollers, for each of the two wheels of the 10 wheelset to lift, drive and lower the wheelset before, during and after machining, characterised in that * each drive roller (1) is rotatably and driveably mounted on the free end (21, 21') of a roller carrier link (12, 12'), that e comprises a swivel link (13, 13') and a swivel lever (4, 4') which are firmly 15 joined with one another on the first end (14, 14') of the swivel lever (4, 4'), while the roller carrier link (12, 12') is mounted in the lathe frame (10) and can pivot about an axis of rotation (A, B) that extends at a radial distance (24) and parallel with the axis of rotation (Z, Z') of the wheelset (22, 22'), wherein 20 e the free second end (15, 15') of the swivel lever (4, 4') is articulately joined via e first joints (16, 16', 33, 33') with * a lifting cylinder (5, 5') that at the same time engages a second lever (34, 34') that 25 * in the associated lathe frame (10) of the underfloor wheelset lathe is pivotably mounted in a bearing (38, 38') and at the same time * is joined with the second lever (34, 34') of the adjacent roller carrier link (12, 12') in a rotationally prevented manner. 30

2. An underfloor wheelset lathe according to claim 1, characterised in that the lifting cylinder (5, 5') is approximately horizontally arranged. 9

3. An underfloor wheelset lathe according to claim 1, characterised in that between the first joints (16, 16', 33, 33') and the free external end (35, 35') of the second lever (34, 34') an intermediate lever (36, 36') and a second joint (37, 37') are provided. 5

4. An underfloor wheelset lathe according to claim 1, characterised in that the rotationally prevented joint between the second levers (34, 34') comprises a gearing (39, 39') at that end of the second lever (34, 34') where the second lever (34, 34') is mounted in the lathe frame (10). 10

5. An underfloor wheelset lathe according to claim 4, characterised in that the gearing (39, 39') is provided concentrically about the bearings (38, 38') of the second levers (34, 34'). 15

6. An underfloor wheelset lathe according to claim 1, characterised in that the drive motor (3, 3') for the drive rollers (1, 1') is provided on the swivel link (13, 13').

7. An underfloor wheelset lathe according to claim 1, characterised in that on the 20 swivel link (13, 13') a reduction gearbox (2, 2') is provided for the drive of the drive rollers (1).

8. An underfloor wheelset lathe according to claim 1, characterised in that the swivel link (13, 13') is rotationally flexibly fastened on the swivel lever (4, 4'). 25

9. An underfloor wheelset lathe according to claim 8, characterised in that the rotationally flexible fastening is a torsion bar (40).

10. An underfloor wheelset lathe according to claim 9, characterised in that the 30 torsion bar (40) is joined with the swivel link (13, 13') by means of splines (41).