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(11) | EP 0 177 460 B1 |
| (12) | EUROPEAN PATENT SPECIFICATION |
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| (54) |
Bogie for railway vehicles with independent wheels Drehgestell mit freilaufenden Rädern für Schienenfahrzeuge Boggie à roues indépendantes pour véhicules ferroviaires |
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| Note: Within nine months from the publication of the mention of the grant of the European patent, any person may give notice to the European Patent Office of opposition to the European patent granted. Notice of opposition shall be filed in a written reasoned statement. It shall not be deemed to have been filed until the opposition fee has been paid. (Art. 99(1) European Patent Convention). |
[0001] The present invention relates in general to bogies for railway vehicles, in particular of the type defined in the pre-characterising portion of Claim 1.
[0003] Due to its structure, this bogie has independent self-steering wheels, which results in a series of important advantages over conventional bogies, in terms of both simplicity of construction and improved functioning in use.
[0004] The present invention constitutes, in fact, an improvement in the one forming the subject of the patent documents cited above, and its object is to simplify the construction while ensuring dimensional stability in use.
[0005] According to the invention, this object is achieved due to the feature set forth in the characterising portion of Claim 1.
[0006] The invention will now be described in detail with reference to the appended drawings supplied purely by way of non-limiting example, in which:
Figure 1 is a partially sectional plan view from above of a bogie for railway vehicles according to the. invention,
' Figure 2 is an elevational view along the arrow II of Figure 1,
Figure 3 is a sectional view taken on the line III-III of Figure 1, and
Figure 4 is a section taken on the line IV-IV of Figure 1.
[0007] The bogie illustrated in the Figures is substantially analogous to the one described and illustrated in GB-A-2 050 273 cited above. Briefly, this comprises a central support structure 10 to which are articulated four arms 12 each bearing an idle wheel 14.
[0008] The support structure 10 comprises two lateral supports 94 rigid with two transverse tubular supports 54 and defining with them a space 96 within which extends a vertical-axis bush 98 in which is inserted a vertical pin 28 for articulation of the bogie to the vehicle body.
[0009] The upper end of the pin 28 is integral with frusto-conical attachment member 100 intended to be secured rigidly to the base of the body and the opposing sides of which are connected to the lateral supports 94 by two vertical connecting rods 102.
[0010] Two shafts 56 are rotatably mounted within the two transverse tubular supports 54. The end of each shaft 56 project from the respective tubular support 54 and each supports, through an elastic coupling, one of the arms 12 bearing the wheels 14. Bushes of elastomeric material, not visible in the drawings, usually of the type sold under the trade mark "SUTUCO" by the Italian firm SAGA of Milan, are interposed coaxially between each of the shafts 56 and the respective tubular support 54. The purpose of the bushes of elastomeric material is to permit a misalignment between the shafts 56 and the respective tubular spacers 88 so as to effect the self-steering of the arms 12 bearing the wheels 14 during travel of the bogie around curves, and to allow rolling oscillations of these arms 12. In this manner, each shaft 56 connecting a pair of arms 12 is subject to simple bending stresses in use, and not to twisting actions.
[0011] Supported in a projecting manner at the free end of each arm 12 is a spindle 68 which, with the interposition of rolling bearings, serves as the support for rotation of the respective wheel 14. A horizontal support 72 projects from the free end of each spindle 68, against which bears a helical suspension spring 76 intended to react at its upper end against the base of the body of the railway vehicle. The four springs 76 constitute the only suspension of the bogie: in this way, the structural weight of the body passes directly to the wheels 14 through the springs 76, without stressing intermediate members.
[0012] Connected to the springs 76 are four vertical hydraulic shock-absorbers 80, each of which is interposed between the free end of one of the arms 12 and the body of the vehicle.
[0013] Each wheel 14 comprises a one-piece body of hot rolled steel which has a rim of variable conicity and the outer faces of which co-operate with a brake caliper 82 supported by the respective arm 12.
[0014] The bogie also includes a pair of transverse hydraulic shock-absorbers 84 articulated to the sides of the support 10 and intended to be connected to the body of the vehicle, and a pair of anti-roll bars, generally indicated 86, which connect the two pairs of arms 12 supported by the two shafts 56.
[0015] A tubular spacer member 88 aligned with the spindles 68 of the wheels 14 is interposed between the free ends of the two arms 12 supported by each shaft 56.
[0016] The two tubular spacers 88, whose ends are rigidly connected to the ends of the corresponding arms 12, serve to maintain the wheels 14 at the prescribed gauge, which is advantageous both during the assembly of the bogie and when it is in use.
[0017] According to the invention, the arms 12 of the two pairs located on the same side of the bogie are articulated to each other in correspondence with their facing ends. In fact, one arm 12 of each pair has a longitudinal appendage 90 which extends towards the arm 12 of the other pair situated on the same side of the bogie and is connected to that arm by means of a transverse pin 92, with the interposition of members of elastomeric material, not shown.
[0018] The bush 98 is surrounded at its upper end by a collar 104 and at its lower end by a collar 106, with the interposition of respective sleeves of elastically-yielding material 108 and 110. The upper collar 104 is connected in turn to the two tubular supports 54 by a pair of substantially horizontal longitudinal connecting rods 112 arranged in a Z-configuration.
[0019] The lower collar 106 has two lateral buffers 114 of elastomeric material directed parallel to the transverse axis A of the bogie and having respective convexly-profiled ends 11 a facing corresponding convexly-profiled ends 116a of a pair of similar buffers 116 protruding from the lateral supports 94. Each pair of buffers 114, 116 is surrounded by a helical compression spring 118 reacting between the collar 106 and the corresponding lateral support 94.
1. Bogie for railway vehicles, comprising a central support structure (10) including
two transverse tubular supports (54) within which are mounted, with the interposition
of bushes of elastically-yielding material, two shafts (56) each of which supports
at its ends a pair of substantially longitudinal arms (12) bearing the spindles (68)
of the wheels (14) at their free ends, means for connecting the central structure
to the body of the railway vehicle in an articulated manner transverse and vertical
suspension means (76) for mounting between the bogie and the body, and a tubular spacer
member (88) - aligned with the spindles (68)'..of the wheels (14) and rigidly connecting
the free ends of the two longitudinal arms (12) supported by each shaft (56), characterised
in that the arms (12) of the two pairs situated on the same side of the bogie are
articulated to each other in correspondence with their facing ends by means of a longitudinal
appendage of one arm (12) of each pair extending towards the arm (12) of the other
pair situated on the same side of the bogie and connected to that arm (12) by means
of a transverse pin (92).
2. Bogie according to Claim 1, characterised in that the central support structure
(10) includes two lateral supports (94) rigid with the tubular supports (54) and defining
with the latter a space (96) into which extends a bush (98) for a vertical pin (28)
for articulation to the body of a railway vehicle, resilient transverse centring means
(114, 116, 118) being associated with the bush (98) and the bush (98) being connected
on one side to one of the tubular supports (54) and on its other side to the other
of the tubular supports (54) by means of a pair of longitudinal connecting rods (112).
3. Bogie according to Claim 2, characterised in that the resilient centring means
comprise two pairs of buffers of elastically-yielding material (114, 116) which are
located opposite each other, are fixed respectively to the lateral supports (94) and
the bush (98) for the articulation pin (28), and have respective facing ends with
convex profiles (114a, 116a), and a pair of helical springs (118) which are interposed
between the bush (98) and the lateral supports (94) and surround the buffers (114,116).
1. Drehgestell für Schienenfahrzeuge wobei das Drehgestell einen zentralen Tragrahmen
(10), der zwei rohrartige Querträger (54) aufweist, in denen unter Zwischenlage von
Buchsen aus einem elastischen Material zwei Wellen (56) befestigt sind, von denen
jede an ihren Enden ein Paar von im wesentlichen länglichen Armen (12) trägt, in denen
die Achsen (68) der Räder (14) an ihren freien Enden gelagert sind, eine Einrichtung,
um den zentralen Rahmen mit dem Wagenaufbau des Schienenfahrzeugs gelenkig zu verbinden,
eine Quer- und Vertikalaufhängung (76), um sie zwischen dem Drehgestell und dem Wagenaufbau
zu befestigen, sowie ein rohrartiges Abstandsglied (88) enthält, das mit den Achsen
(68) der Räder (14) ausgerichtet ist und die freien Enden der beiden Längsarme (12),
die von jeder Welle (56) gehalten werden, starr verbindet, dadurch gekennzeichnet,
daß die Arme (12) der beiden Paare, die an der selben Seite des Drehgestells angeordnet
sind, in Übereinstimmung mit ihren gegenüberliegenden Enden mit Hilfe eines Längsfortsatzes
von einem Arm (12) eines jeden Paares zueinander gelenkig verbunden werden, der zum
Arm (12) des anderen Paares verläuft, der an der selben Seite des Drehgestells angeordnet
und mit diesem Arm (12) mit Hilfe eines Querzapfens (92) verbunden ist.
2. Drehgestell gemäß Anspruch 1, dadurch gekennzeichnet, daß der zentrale Tragrahmen
(10) zwei seitliche Halterungen (94) aufweist, die mit den rohrartigen Trägern (54)
starr verbunden sind und mit diesen einen Zwischenraum (96) bilden, in den eine Buchse
(98) für einen Vertikalzapfen (28) für eine Gelenksverbindung mit dem Wagenaufbau
eines Schienenfahrzeugs verläuft, wobei eine federnde Querzentriereinrichtung (114,116,118)
der Buchse (98) zugeordnet ist, und wobei die Buchse (98) an einer Seite mit einem
der rohrartigen Träger (54) und an der anderen Seite mit dem anderen rohrartigen Träger
(54) mit Hilfe eines Paares von länglichen Verbindungsstangen (112) verbunden ist.
3. Drehgestell gemäß Anspruch 2, dadurch gekennzeichnet, daß die federnde Zentriereinrichtung
zwei Paare von Puffern aus einem elastischen Material (114, 116), die einander gegenüberliegend
angeordnet sind, wobei sie jeweils an den seitlichen Halterungen (94) und der Buchse
(98) für den Gelenkszapfen (28) befestigt sind, und wobei sie gegenüberliegende Enden
mit einem konvexen Umriß (114a, 116a) besitzen, sowie ein Paar von Schraubenfedern
(118) enthält, die zwischen der Buchse (98) und den seitlichen Halterungen (94) angeordnet
sind und die Puffer (114, 116) umschließen.
1. Boggie pour véhicules ferroviaires, comprenant une structure support centrale (10)
qui comprend elle-même deux supports tubulaires transversaux (54) dans lesquels sont
montés, avec interposition de bagues dune matière élastique, deux arbres (56) dont
chacun supporte à ses extrémités deux bras (12) sensiblement longitudinaux qui portent
les fusées (68) des roues (14) à leurs extrémités libres, des moyens servant à relier
la structure centrale a la caisse du véhicule ferroviaire par une liaison articulée,
des moyens de suspension transversaux et verticaux (76) qui s'interposent entre le
boggie et la caisse, et un élément entretoise tubulaire (88) aligné sur les fusées
(68) des roues (14) et qui assemble rigidement les extrémités libres des deux bras
longitudinaux (12) supportés par chaque arbre (56), caractérisé en ce que les bras
(12) des deux paires qui sont situés sur le même côté du boggie sont articulés l'un
sur l'autre au droit de leurs extrémités qui se font face à l'aide d'un prolongement
longitudinal d'un bras (12) de chaque paire, dirigé vers le bras (12) de l'autre paire
qui est situé sur le même côté du boggie, et relié à ce bras (12) par une broche transversale
(92).
2. Boggie selon la revendication 1, caractérisé en ce que la structure support centrale
(10) comprend deux supports latéraux (94) qui sont rigidement solidaires des supports
tubulaires (54) ef définissent avec ces derniers un espace (96) dans lequel s'étend
un manchon (98) recevant un axe vertical (28) qui sert à l'articulation du boggie
sur la caisse d'un véhicule ferroviaire, des moyens élastiques de centrage transversal
(114, 116, 118) étant associés au manchon (98) et le manchon (98) étant relié, d'un
côté à l'un des supports tubulaires, (54) et, de l'autre côté, à l'autre des supports
tubulaires (54), à l'aide d'une paire de bielles longitudinales (112).
3. Boggie selon la revendication 2, caractérisé en ce que les moyens de centrage élastiques
comprennent deux paires de tampons en matière élastique (114,116) qui sont placés
face à face, qui sont fixés respectivement aux supports latéraux (94) et au manchon
(98) recevant l'axe d'articulation (28), et présentent des extrémités respectives
opposées face à face qui sont munies de profils convexes (114a, 116a), et une paire
de ressorts hélicoïdaux (118) qui sont interposés entre le manchon (98) et les supports
latéraux (94) et qui entourent les tampons (114, 116).