EP4242085A1 - Verbessertes eisenbahndrehgestell und schienenfahrzeug mit einem solchen drehgestell - Google Patents

Verbessertes eisenbahndrehgestell und schienenfahrzeug mit einem solchen drehgestell Download PDF

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Publication number
EP4242085A1
EP4242085A1 EP23160975.1A EP23160975A EP4242085A1 EP 4242085 A1 EP4242085 A1 EP 4242085A1 EP 23160975 A EP23160975 A EP 23160975A EP 4242085 A1 EP4242085 A1 EP 4242085A1
Authority
EP
European Patent Office
Prior art keywords
frame
sub
railway bogie
wheels
railway
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP23160975.1A
Other languages
English (en)
French (fr)
Inventor
Roberto Ferrario
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Aar Ingegneria Di Ferrario Roberto & C Sas
Original Assignee
Aar Ingegneria Di Ferrario Roberto & C Sas
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Aar Ingegneria Di Ferrario Roberto & C Sas filed Critical Aar Ingegneria Di Ferrario Roberto & C Sas
Publication of EP4242085A1 publication Critical patent/EP4242085A1/de
Pending legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61F—RAIL VEHICLE SUSPENSIONS, e.g. UNDERFRAMES, BOGIES OR ARRANGEMENTS OF WHEEL AXLES; RAIL VEHICLES FOR USE ON TRACKS OF DIFFERENT WIDTH; PREVENTING DERAILING OF RAIL VEHICLES; WHEEL GUARDS, OBSTRUCTION REMOVERS OR THE LIKE FOR RAIL VEHICLES
    • B61F3/00—Types of bogies
    • B61F3/02—Types of bogies with more than one axle
    • B61F3/08—Types of bogies with more than one axle without driven axles or wheels
    • B61F3/10—Types of bogies with more than one axle without driven axles or wheels with three or more axles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61F—RAIL VEHICLE SUSPENSIONS, e.g. UNDERFRAMES, BOGIES OR ARRANGEMENTS OF WHEEL AXLES; RAIL VEHICLES FOR USE ON TRACKS OF DIFFERENT WIDTH; PREVENTING DERAILING OF RAIL VEHICLES; WHEEL GUARDS, OBSTRUCTION REMOVERS OR THE LIKE FOR RAIL VEHICLES
    • B61F5/00—Constructional details of bogies; Connections between bogies and vehicle underframes; Arrangements or devices for adjusting or allowing self-adjustment of wheel axles or bogies when rounding curves
    • B61F5/38—Arrangements or devices for adjusting or allowing self- adjustment of wheel axles or bogies when rounding curves, e.g. sliding axles, swinging axles

Definitions

  • the present invention relates to a railway bogie, in particular a railway bogie with passive steering.
  • bogies of a railway vehicle first of all comprise a rigid frame and at least one pair of wheelsets carried by the rigid frame and free to rotate relative to the latter about a rotation axis orthogonal to the vertical mid-plane of the bogie.
  • the wheelsets each comprise a pair of wheels rigidly mutually interconnected by an axle (or wheelset).
  • these wheelsets are mechanically constrained to the rigid frame so that they remain orthogonal to the vertical mid-plane of the railway bogie, i.e., they are not able to rotate about a vertical rotation axis.
  • railway vehicles equipped with the bogies described above are unable to make sharp turns with a bending radius of as little as a few metres, such as, for example, the curves of urban tram or metro lines, with all the problems that this entails.
  • the object of the present invention is to provide a railway bogie which allows the above-mentioned need to be met in a simple and inexpensive way.
  • number 1 indicates, as a whole, a bogie of a railway vehicle, in particular a railway bogie with passive steering.
  • Such a railway vehicle can comprise, for example, at least one body (or wagon or carriage) carried by at least one railway bogie 1.
  • the railway bogie 1 first of all comprises an articulated chassis or frame 2 which extends along a longitudinal axis A, and a plurality of wheels 3 resting on the rails which are carried in a rotatable manner by the articulated frame 2 independently of each other to allow the movement of the railway bogie 1 on a rolling plane (the rail plane) P.
  • the articulated frame 2 comprises a central sub-frame 4 carrying a first pair of wheels 3a.
  • the rotation axis R 1 is locally orthogonal to the vertical mid-plane of the central sub-frame 4.
  • the articulated frame 2 comprises a front sub-frame 5 which carries a second pair of wheels 3b and is carried in a movable manner by the central sub-frame 4, so that it rotates/oscillates/swings about a rotation axis S 1 .
  • the rotation axis S 1 is orthogonal to the rolling plane P, i.e., it is vertical.
  • the front sub-frame 5 is mechanically connected to the central sub-frame 4 via a joint with two degrees of freedom, in particular the rotation about the rotation axis S 1 and the translation along the longitudinal axis A.
  • the wheels 3b instead, are connected to the front sub-frame 5 on opposite sides of the longitudinal axis A and rotate about the same rotation axis R 2 .
  • the rotation axis R 2 is locally orthogonal to the vertical mid-plane of the front sub-frame 5.
  • the rear sub-frame 6 is mechanically connected to the central sub-frame 4 via a joint with two degrees of freedom, in particular the rotation about the rotation axis S 2 and the translation along the longitudinal axis A.
  • the rotation axis R 3 is locally orthogonal to the vertical mid-plane of the rear sub-frame 6.
  • the rotation axis S 2 is preferably positioned substantially equidistant from the rotation axis R 1 and the rotation axis R 3 , i.e., it is positioned approximately in the middle of the wheelbase l 2 between the pair of wheels 3a and the pair of wheels 3c.
  • the front sub-frame 5 and the rear sub-frame 6 are also connected to the central sub-frame 6 on opposite sides along the longitudinal axis A, advantageously in a mirror-like position.
  • the front sub-frame 5 is carried in a freely rotatable manner by the central sub-frame 4 via a pin 7 coaxial with the rotation axis S 1 .
  • the rear sub-frame 6, is carried in a freely rotatable manner by the central sub-frame 4 via a pin 8 coaxial with the rotating axis S 2 .
  • the ends 5a and 6a are also pivoted to each other through a pin 9 coaxial with the rotation axis S 3 .
  • the pin 7 and the pin 8, in particular, may be lodged in a slidable manner within openings or slots 10 which can be made in the front sub-frame 5 and the rear sub-frame 6, respectively, so as to allow movement/backlash of these sub-frames relative to each other and parallel to the longitudinal axis A.
  • the railway bogie 1 is preferably equipped with an angular backlash limiting device 11, which is configured for limiting the maximum articulation angle of the articulated frame 2, i.e., the maximum rotation angle of the above-mentioned sub-frames relative to each other.
  • this limiting device 11 may comprise an oblong-shaped slot 12, which extends in a transverse direction d 1 orthogonal to the vertical mid-plane of the central sub-frame 4 and may be made in the central sub-frame 4, preferably below the ends 5a and 6a of the sub-frames 5 and 6.
  • the pin 9 is configured to be lodged in a slidable manner within the oblong slot 12, so that it slides back and forth in the transverse direction d 1 during the rotation of the front 5 and rear 6 sub-frames in relation to the central sub-frame 4.
  • the size of the oblong slot 12 defines the maximum width of the angular backlash of the articulated frame 2.
  • At least one wheel 3 is mechanically coupled to the articulated frame 2, or rather to the central sub-frame 4, front sub-frame 5 or rear sub-frame 6, via a corresponding suspension assembly 14 (or primary suspension assembly), preferably in a stable but easily removable manner.
  • the suspension assembly 14 comprises elastic means 16 which are mechanically interposed between the articulated frame 2 and the support member 15, and are adapted to exert forces between them.
  • the elastic means 16 are configured to dampen the relative movement between the articulated frame 2 and the support member 15.
  • the elastic means 16 may comprise coil springs.
  • the articulated frame 2 or rather the central sub-frame 4, the front sub-frame 5 and/or the rear sub-frame 6 comprises at least two lateral shoulders 17 carried by the articulated frame 2 on opposite sides with respect to the longitudinal axis A.
  • the lateral shoulders 17 are arranged facing each other on opposite sides relative to the longitudinal axis A.
  • Each support member 15 is also configured to cooperate in a slidable manner with a corresponding lateral shoulder 17.
  • the support member 15 is preferably T-shaped and carried by the articulated frame 2 so that the horizontal portion of the T faces the rolling plane P.
  • the support member 15 preferably comprises a central portion 15a which is configured to carry the wheel 3 in a freely rotatable manner and to cooperate in a slidable manner with the lateral shoulder 17.
  • the support member 15 preferably comprises two lateral portions 15b which extend cantilevered from the central portion 15 in the horizontal direction and are configured to cooperate with the elastic means 16.
  • the articulated frame 2 or rather the central sub-frame 4 the front sub-frame 5 and/or the rear sub-frame 6 preferably have an approximately C-shaped cross-section.
  • the articulated frame 2 preferably comprises a horizontal base wall 18; the lateral shoulders 17 rise cantilevered from the base wall 18, on opposite sides in relation to the longitudinal axis A.
  • each lateral shoulder 17 preferably comprises a lateral wall 19 which extends in a vertical direction from the base wall 18, and an upper wall 20 which extends cantilevered in a horizontal direction from the lateral wall 19, spaced above the base wall 18.
  • the lateral shoulders 17, or rather the lateral walls 19, are preferably provided with an opening 21 which extends along the direction d 2 and is configured to lodge in a slidable manner the support member 15.
  • the opening 21 also extends along the upper walls 20. In other words, the opening 21 is open at the top.
  • the support member 15 is configured to be carried by the articulated frame 2 so that it is free to move along the direction d 2 in the space comprised between the base wall 18 and the upper wall 20.
  • the central portion 15a of the support member 15 is configured to cooperate in a slidable manner with the opening 21, preferably by means of a form-fit coupling.
  • one of the axial edges of the opening 21 along the longitudinal axis A and the central portion 15a can comprise a protruding rib 22 which cooperates in a slidable manner with a complementarily shaped groove 23 realized on the other of the axial edge of the opening 21 and the central portion 15a.
  • the elastic means 16 are preferably lodged in the space comprised between a lateral portion 15b of the support member 15 and a corresponding upper wall 20 of the articulated frame 2.
  • the articulated frame 2 is in an aligned operating configuration, i.e., the front sub-frame 5, the central sub-frame 4 and the rear sub-frame 6 are aligned along the longitudinal axis A, and the rotation axes R 1 , R 2 and R 3 of the wheels 3 are parallel to each other.
  • the front sub-frame 5 and the rear sub-frame 6 rotate relative to the central sub-frame 4 about respective rotation axes S 1 and S 2 in opposite directions, following the profile of the rails.
  • the articulated frame 2 arranges itself in a rotated operating configuration.
  • the pin 9 when travelling around a curve, the pin 9 translates along the oblong slot 12 in the transverse direction d 1 , and the front 5 and rear 6 sub-frames translate parallel to the longitudinal axis A approaching the central sub-frame 4, guided by the movement of the pins 7 and 8 along the corresponding slots 10.
  • the railway bogie 1 is able to keep all the wheels 3 perfectly parallel and aligned with the rails when travelling around a curve, drastically reducing the noise produced by the railway vehicle and the wear of the rails and wheels.
  • all the pairs of wheels 3 of the railway bogie 1 arrange themselves with their rotation axis orthogonal to the curve described by the rails, and travel along a circular trajectory with the same bending radius as the rails.
  • the absence of bulky axles rigidly connecting the wheels 3 to each other in pairs frees up the space between the wheels 3 and allows the position of the wagon to be lowered in relation to the bogie 3. Accordingly, the centre of gravity of the railway vehicle 1 can be lowered, with all the benefits that this entails.
  • the wheels 3 and the suspension assemblies 14 can also be applied to railway bogies with different rail gauges (track widths) without requiring structural changes to the railway bogie 1.
  • the structure of the railway bogie 1 makes it much easier and cheaper to maintain the railway vehicle 1, because it allows the wheels 3 to be replaced/removed individually and independently of each other.
  • each individual wheel 3 can be removed from the bogie 1 by simply removing the elastic means 16 and lifting the wheel 3 and the support member 15 attached thereto until the support member 15 is disengaged from the articulated frame 2.
  • independent wheels 3 are not rigidly constrained to each other by axles, they can rotate at different angular speeds. This greatly reduces the well-known snaking phenomenon, and avoids the use of expensive anti-snaking systems.
  • the railway bogie 1 may be equipped with drive units carried by the wheels 3 and configured to provide them with drive torque for moving the railway vehicle on the rails.
  • these drive units may comprise electric motors operatively coupled to the wheels 3.
  • the railway bogie 1 may also comprise braking units carried by the wheels 3 and configured to brake the railway vehicle.
  • these braking units may comprise disc brakes operatively coupled to the wheels 3.
  • the pair of central wheels 3a may carry said drive units, whereas the pairs of front 3b and rear 3c wheels may carry said braking units.
  • the positioning of the drive units on the wheels 3 of the railway bogie 1 allows the drive torque to be distributed along the railway vehicle, greatly increasing the traction of the railway vehicle on the rails during acceleration.
  • Such use of the drive units significantly increases the performance of the railway vehicle during acceleration and/or on steep slopes, and may avoid the use of traditional sandboxes to increase the grip between the wheels and the rails.
  • the elastic means 16 may be leaf springs operatively interposed between the articulated frame 2 and the support member 15.
  • the articulated frame 2 could comprise a single upper wall 20 extending like a bridge between two lateral walls 19 facing each other on opposite sides in relation to the longitudinal axis A.
EP23160975.1A 2022-03-10 2023-03-09 Verbessertes eisenbahndrehgestell und schienenfahrzeug mit einem solchen drehgestell Pending EP4242085A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT102022000004646A IT202200004646A1 (it) 2022-03-10 2022-03-10 Carrello ferrotranviario migliorato e veicolo ferrotranviario provvisto di tale carrello

Publications (1)

Publication Number Publication Date
EP4242085A1 true EP4242085A1 (de) 2023-09-13

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP23160975.1A Pending EP4242085A1 (de) 2022-03-10 2023-03-09 Verbessertes eisenbahndrehgestell und schienenfahrzeug mit einem solchen drehgestell

Country Status (2)

Country Link
EP (1) EP4242085A1 (de)
IT (1) IT202200004646A1 (de)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US422079A (en) * 1890-02-25 Truck for cars
US1728096A (en) * 1926-09-30 1929-09-10 Algrain Paul Rolling stock of railways, tramways, and road transport vehicles
US4164188A (en) * 1977-05-26 1979-08-14 Pullman Incorporated Self steering railway car
EP0727339A2 (de) * 1995-02-17 1996-08-21 Stork Rmo B.V. Laufwerksanordnung mit minimalem Spiel für ein Schienenfahrzeug mit radialer Einstellung von Radkappen oder Radsätzen
EP2184214A1 (de) * 2007-07-30 2010-05-12 The University of Tokyo Fahrzeug mit selbstlenkendem aufbau

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US422079A (en) * 1890-02-25 Truck for cars
US1728096A (en) * 1926-09-30 1929-09-10 Algrain Paul Rolling stock of railways, tramways, and road transport vehicles
US4164188A (en) * 1977-05-26 1979-08-14 Pullman Incorporated Self steering railway car
EP0727339A2 (de) * 1995-02-17 1996-08-21 Stork Rmo B.V. Laufwerksanordnung mit minimalem Spiel für ein Schienenfahrzeug mit radialer Einstellung von Radkappen oder Radsätzen
EP2184214A1 (de) * 2007-07-30 2010-05-12 The University of Tokyo Fahrzeug mit selbstlenkendem aufbau

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Publication number Publication date
IT202200004646A1 (it) 2023-09-10

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