The invention relates to a two-axle modular bogie assembly providing for manufacturing bogies of trailer and driven vehicles for railway operational and technical service purposes, having various track gauges, axle loads, drive systems and speeds, from modules of a uniform design. The modular bogie according to the invention is advantageous in particular for non-specific functions in vehicles for railway operational and technical services purposes manufactured in dividually or in small series.

Furthermore, the modular bogie according to the invention is advantageously applicable for vehicles operating under different infrastructural conditions, but designed for identical techni cal service purposes that must be manufactured according to different technical specifications according to the requirements of various operators.

"Railway vehicles" (Vasciti Jarmuvek), a textbook by Dr. Gyorgy Sostarics - Dr. Vilmos Balogh (Tankonyvkiado Budapest, 1991) discloses the structural design of railway bogies.

One of the most widespread bogie types in European railway practice is the Y25 and its vari ants, a freight-car type bogie, a modified/converted and derived versions of which are often used also in technical service vehicles. At the time of our application, such bogie variants were disclosed on the following websites: https://de.wikipedia.org/wiki/Drehgestell Bauart Y25 http://www.drehgestelle.de/6/v25 t.html http://www.drehgestelle.de/6/Y25 F6.html

In European practice, manufacturers often apply their own bogie designs for the vehicles they manufacture, technical service vehicles included. At the time of our application, such bogie variants were disclosed on the following websites: http://www.drehqestelle.de/Archiv%20lnnoTrans%202Q14.html http://www.drehgestelle.de/aktuell%20lnnotrans%202016.html

In American practice, the modernised/transformed versions of the Bloomberg driven bogies are used also in technical service vehicles: https://www.loram.com/products/rail-grinding/specialty-rail- grinding/rgs/

https://en.wikipedia.org/wiki/Blomberg B

To simplify manufacture, some manufacturers have developed bogie families typically applic- ably also for freight car or technical service purposes consisting of identically structured ele- merits of different sizes in order to meet the various technical specifications: https://www.amstedrail.com/products-services/bogies

Siemens Transportation Systems - First Class Bogies, (Printed in Austria, Version: 08/08)

It is a common drawback of these bogies that, given their individual design and realisation ad justed to the requirements of the given infrastructure or the operational task/environment ever of technical service vehicles for different purposes and of different designs, such as crane vehicle, overhead line construction/maintenance vehicle, track/infrastructure status measur ing/diagnosing vehicle, accident ambulance, fire service, repair, reverse or operational purpose vehicles, their bogies are also individually designed and realised. Such vehicles are typically de vices produced in small numbers, of low mileage, long useful life and a particularly high value; consequently, the obvious priority expectation of manufacturers and operators is to reduce their investment and operation costs. The highest possible degree of standardisation of the constituent elements of vehicles representing high type numbers is a significant contribution to meeting this expectation. Several companies have developed so-called platform-based vehicles where individual superstructures are applied for various operational tasks on similar base vehi cles, but given the differences of the main technical parameters (track gauge, gauge, axle load etc.) of the user infrastructures of vehicles of this design, they require the application of differ ent bogies and undercarriage.

The goal set for the invention is to develop a two-axle railway bogie that can be manufactured and operated economically even in case of operation under the conditions of infrastructures characterised by different technical parameters, even if manufactured small series or individu ally.

The solution is based on the recognition that, in bogies operating under the conditions of infra structures characterised by different technical parameters, a bogie family can be developed by using uniform modules that have standardised parts and structural elements, and the targeted selection/design of the latter makes it possible to develop and economically manufacture and operate bogies of different track gauges, axle loads, drive systems and fitting into different con struction gauges even in case of small-series production or of various individual vehicles.

The task being set has been solved by a two-axle bogie according to the characteristic features of claim 1. According to this, a two-axle modular bogie assembly has been provided where the bogie comprises a bogie frame of a welded structure and modular construction, consisting of two longitudinal beam modules and one transversal beam module, the wheelsets are assem- bled of bloc wheels and a wheelset axle, a break system comprising a disc brake unit pro wheel, the brake discs of the disk brake are mounted on the bloc wheel, the axle guard of wheelset axle is realised by link arms, between the link arms and the longitudinal beam module of the bogie frame a primary helical spring system and vertically arranged hydraulic dampers are in serted, and the underframe of the railway vehicle is connected to the modular bogie frame through layered rubber springs arranged on the longitudinal beam modules (3), and the maxi mum width of the modular bogie is limited by the rolling stock construction gauge.

According to a preferred embodiment the wheelset axles are equipped with an electric drive unit, to which an electric traction motor fixed to the transversal beam module of the modular bogie frame is connected via a clutch and a one- or two-stage roller gear axle drive, and a torque arm is inserted between the housing of the axle drive and the transversal beam module of the modular bogie frame.

According to a further preferred embodiment the wheelset axles are equipped with a hydro- statical drive unit, where a hydrostatical motor fixed on the housing of the axle drive is con nected through the one- or two-stage cylindrical axle drive to the wheelset axle, and the torque arm is inserted between the housing of the axle drive and the transversal beam module of the bogie frame.

According to a further preferred embodiment the wheelset axles are equipped with a one- or two-stage conical axle drive, a cardan shaft is arranged between the axle drives, and a torque arm is arranged between the housing of the axle drive and the transversal beam module of the bogie frame.

According to a further preferred embodiment between the modular bogie and the underframe of the railway vehicle a centre pivot establishing a connection is arranged, on a cylindrically shaped part of that slotted conical parts are arranged, which fit into an intermediate part hav ing an inner conical surface, two sides of the intermediate part are bevelled ensuring connec tion with the transversal beam module of the bogie frame by layered rubber pieces through wedge-shaped straining parts, a plane bumper surface is designed on the side of intermediate part perpendicular to the longitudinal axis of the modular bogie, and opposite to that, rubber bumpers are arranged on the transversal beam module.

According to a further preferred embodiment a width of the transversal beam module of the bogie frame is defined so that a track gauge of the wheels has a standard value of 1435 mm or, in case of deviation from that, one of the values of 1000 mm, 1067 mm, 1520 mm, 1600 mm, 1667 mm or 1676 mm.

In the following, the modular two-axle bogie according to the invention is described on the ba sis of exemplary embodiments, based on the drawings. In the drawings,

Figure 1 shows a preferred embodiment of the modular bogie according to the invention in side view,

Figure 2 presents the modular bogie shown in Figure 1 in plan view,

Figure 3 is the front view of the modular bogie shown in Figure 1,

Figure 4 presents the plan view of the modular bogie shown in Figure 1 with an electric trac tion motor,

Figure 5 presents the plan view of the modular bogie shown in Figure 1 with a hydrostatical traction motor,

Figure 6 presents the plan view of the modular bogie shown in Figure 1 with a conical axle drive,

Figure 7 is the longitudinal cross-section of a preferred embodiment of the centre pivot of the modular bogie shown in Figure 1, and

Figure 8 is the transversal cross-section of a preferred embodiment of the centre pivot of the modular bogie shown in Figure 1.

Figures 1, 2 and 3 show a two-axle modular bogie 1 used in railway vehicles, comprising a bogie frame 2 of a welded, modular structure, comprising two longitudinal beam modules 3 and one transversal beam module 4. Wheelsets comprise bloc wheels 5 and a wheelset axle 6. A brake system comprises one disc brake unit 7 per wheel, where brake discs 8 are mounted on the bloc wheels 5. The axle guard of the wheelset axle 6 is realised with link arms 9. Between link arms 9 and the longitudinal beam module 3 of the bogie frame 2, primary helical springs 10 and vertically arranged hydraulic dampers 11 are installed. The bogie frame 2 is connected to an underframe 12 of the railway vehicle through rubber springs 13 placed on its longitudinal beam modules. The maximum width A of the bogie 1 is limited by the rolling stock construction gauge ever; its size is defined by the nominal diameter E of the bloc wheels 5, wheel base C of the wheelsets and width D of the transversal beam modules 3 of the bogie frame 2. In the inven tion, the nominal diameter E of the bloc wheels 5 is expediently 770-1250 mm, the wheel base C of the wheelset 6 is expediently 2300-2800 mm. In the invention, width D of the transversal beam modules 4 shall be chosen so that, in case of deviation from the 1435 mm nominal stan dard track gauge B , track gauge B should preferably be 1000 mm or 1067 mm, or 1520 mm, or 1600 mm, or 1667 mm, or 1676 mm. In the most widespread vehicles of 1435 mm nominal track gauge B, the maximum width of modular bogies 1 made according to the invention is smaller than the inner dimensions of the most frequently occurring European, American and British rolling stock construction gauges marked UIC 505-1, AAR Plate C and W6a, respectively.

Figure 4 shows a modular bogie 1 according to the invention where wheelset axles 6 are equipped with an electric drive, where an electric traction motor 14 fixed on the transversal beam module 4 of the bogie frame 2 is connected through a clutch 15 or an one- or two-stage cylindrical axle drive 16 to the wheelset axle 6. Between a housing of the axle drive 16 and the transversal beam module 4 of the bogie frame 2, a torque arm 17 is arranged.

Figure 5 shows a modular bogie 1 according to the invention where wheelset axles 6 are equipped with a hydrostatical drive, where a hydrostatical drive 18 fixed on the house of axle drive 16 is connected to wheelset axle 6 through a one- or two-stage roller gear axle drive 16, and torque arm 17 is arranged between the house of axle drive 16 and transversal beam mod ule 4 of bogie frame 2.

Figure 6 shows a modular bogie 1 according to the invention where each wheelset axle 6 is equipped with a one- or two-stage axle drive 26. Between the axle drives 26, an interconnect ing cardan shaft 25 is arranged and, between the house of the axle drive 16 and the transversal beam module 4 of bogie frame 2, the torque arm 17 is arranged.

Figures 7 and 8 show a preferred embodiment of an integrated centre pivot 19 providing for connection between the modular bogie 1 and the railway vehicle underframe 12, with slotted conical parts 20 mounted on its cylindrically designed part, fitting into an intermediate part 21 having interior conical surfaces, and its two sides provide connection to the transversal beam module 4 of the bogie frame 2 through bevelled wedge-shaped straining parts 22 and layered rubber pieces 23. On the side perpendicular to the longitudinal axis of the bogie 1 of the inter mediate part 21, plane bumper surfaces 27 are formed, with rubber bumpers 24 placed oppo site to them on the transversal module 4.

By applying the solution according to the invention, modularly structured bogies of railway ve hicles operating under the conditions of various infrastructures can be manufactured and oper ated economically even in case of individual or small-series manufacturing. List of reference signs

1 bogie

2 bogie frame

3 longitudinal beam module

4 transversal beam module

5 bloc wheel

6 wheelset axle

7 disc brake

8 brake disc

9 link arm

10 helical spring

11 damper

12 underframe

13 rubber spring

14 traction motor

15 clutch

16 axle drive

17 torque arm

18 hydrostatical drive

19 centre pivot

20 slotted conical part

21 intermediate part

22 straining part

23 rubber piece

24 bumper

25 cardan shaft

26 axle drive

27 bumper surface A width

B track gauge

C wheel base

D width

E diameter