TRUCK FOR LOW PLATFORM CARS

BOGIE POUR WAGON A PLATE-FORME SURBAISSEE

English Abstract

In this bogie (1) the static and dynamic forces are
absorbed by the frame (5). In designing the body unit fitted on
the frame (5), therefore, only the unit's own weight and the
passenger load are significant, thus facilitating the use of
extremely lightly-built vehicle bodies. The bogie (1) consists
of single-wheel drive units (2), a longeron (3) interconnecting
them, on each long side of a drive (4), the frames (5) bearing
the end unit (9) and a drive control (6) for turning the
single-wheel drive units (2) horizontally depending on the curves. A
wheelless central unit (10) is supported on each short side on
the bogie (1) via a joint (8). A push-pull device (7) engages
with the short side opposite the joint (8). There are no lobbies
inside the vehicle which is thus freely accessible. In the
region of bogie there are recesses in the form of wheel-boxes in
which certain parts of the bogie (1) are arranged.

French Abstract

Dans le cas du présent châssis (1), aussi bien les forces statiques que les forces dynamiques sont absorbées par le cadre de châssis (5). C'est pourquoi, lors du dimensionnement de la caisse de wagon placée sur le cadre de châssis (5), seul le poids propre et la charge des voyageurs sont déterminants, ce qui permet l'utilisation de caisses de wagon en construction extrêmement légère. Le châssis (1) est composé d'appareils de roulement individuels à roues indépendantes (2), d'un entraîneur longitudinal (3) reliant lesdits appareils de roulement (2), d'un entraînement (4) pour chaque côté large, du cadre de châssis (5) portant la caisse d'extrémité (9), et d'une direction d'appareil de roulement (6) pour la torsion horizontale en fonction du déplacement dans les courbes des appareils de roulement individuels (2). Une caisse intermédiaire (10) sans roue s'appuie sur le châssis (1), sur l'un des petits côtés, par l'intermédiaire d'une articulation (8). Sur le petit côté opposé à l'articulation (8) s'applique un dispositif de choc et de traction (7). L'intérieur du wagon ne possède pas de plate-formes et est accessible sans marches. Dans la région du châssis, au-dessous des sièges, des évidements sont prévus sous forme de couvre-roues abritant certains éléments de châssis (1).

Claims

-6-
CLAIMS:
1. An undercarriage for low-floored rail
trucks, the undercarriage having independent steerable
wheels and angled wheel-bridges, the wheel-bridges
being connected to one another by a longitudinal
carrier, and to an undercarriage frame, wherein support
of the undercarriage frame is provided on an outer face
of the wheels, and the position of the wheels can be
varied in an arc depending on the radius of curve
navigated.
2. An undercarriage according to Claim 1,
wherein the longitudinal carrier has a carrier support
connected articulately to the wheel-bridges, two driver
rods connected on one side to the undercarriage frame,
and a driver-equalization lever connecting the carrier
support to the driver rods.
3. An undercarriage according to Claim 1,
wherein a steering rod actuated by a control lever, a
control rod pivoted to a steering lever of a
wheel-bridge and a deflection-angle lever connecting the
steering rod to the control rod and arranged rotatable
on the carrier support are provided, the movement of
the steering lever of a first wheel-bridge being
transmitted by means of a truck steering rod to the
steering lever of a second wheel-bridge, whereby the
wheel-bridges can be controlled.
4. An undercarriage according to Claim 1,
wherein single-wheel drives are arranged on the outer
side of the wheels.

-7-
5. An undercarriage according to Claim 1,
wherein the undercarriage frame is supported on the
outer side of the wheels by box springs which are
supported by elastic spring pads which rest on one side
on gear housings and on another side on spring shock
absorbers.
6. An undercarriage according to Claim 1,
wherein the undercarriage frame is supported on the
outer side of the wheels by box springs resting on one
side on spring pads mounted on stub axles and on the
other side via elastic spring pads and ball ring-mount
sections.
7. An undercarriage according to Claim 1,
wherein the undercarriage frame has longitudinal
support members with spring shock absorbers at its
sides and link supports with link members and/or
coupling supports with push-pull devices for supporting
and/or coupling to further low-platform cars.
8. An undercarriage according to Claim 4,
wherein on each longitudinal side there is provided a
drive motor with spur gearings, the motor being
arranged on a longitudinal support member and acting by
means of universal shafts on the wheels.
9. An undercarriage according to Claims 5
and 6, characterized by the fact that the box springs
are coil springs.

-8-
10. An undercarriage according to Claim 7,
wherein the link member arranged at a joint support has
a ball ring-mount comprising an inner, a central and an
outer ring, a link shaft lying transverse to a
direction of travel and held in elastic mounts on which
shaft a control lever acts, and a link rotating
platform.

Description

CA 02039176 1997-10-23
TRUCK FOR LOW-PLATFORM CARS
The present invention relates to a truck for
low-platform cars having cranked wheel bridges, with
individual wheels arranged on the wheel bridges and
with a truck frame.
From French Unexamined Application 2 573 715
a truck is known on which car bodies with lowered
floors can rest. Each wheel is provided with its own
axle. The axles are connected per set of wheels with a
rigid axle lying below the wheel center point. A truck
frame consisting of longitudinal and transverse members
lies on the axles on the inner side of the wheels. In
the center of the longitudinal member a secondary
springing is provided for the supporting of two car
bodies.
The disadvantage of this known arrangement
is that, despite cranked wheel-set axles, pedestals are
unavoidable within the car. The axles on the wheel
inner side and the truck frame supported thereon reduce
the lowered floor surface and require within the car
cut outs in the form of pedestals and shoulders.
Furthermore, the rigid arrangement of the cranked wheel
set axles no longer satisfy the demands made on modern
trucks.
The invention is directed at remedying this.
The invention, as set forth in the claims, solves the
task of developing a low-platform truck with truck
frame in such a manner that the low-platform car body
is supported by the truck frame and that the
difficulties occurring upon traveling over sections
with curves are, however, nevertheless avoided.

CA 02039176 1999-10-14
- la -
In accordance with one aspect of the present
invention there is provided an undercarriage for low-
floored rail trucks, the undercarriage having
independent steerable wheels and angled wheel-bridges,
the wheel-bridges being connected to one another by a
longitudinal carrier, and to an undercarriage frame,
wherein support of the undercarriage frame is provided
on an outer face of the wheels, and the position of the
wheels can be varied in an arc depending on the radius
of curve navigated.

CA 02039176 1997-10-23
- 2 -
The advantages obtained by the present
invention reside essentially in the fact that a step-
less low-platform car body provided with a continuous
floor and of extremely light construction can be used
and that, despite the truck frame which bears the car
body, travel around curves can be effected silently and
without wear. Furthermore, by the invention complete
preassembly of the truck is made possible so that the
car bodies need then merely to be placed on the truck
frame and attached to it.
The invention will be described below with
reference to the drawing, which shows merely one
embodiment. In the drawing:
Figure 1 is an outside view of a three-part
low-platform car with trucks in accordance with the
invention;
Figure 2 is a diagrammatic cross-sectional
view of the low-platform truck of Fig. 1;
Figure 3 is a horizontal longitudinal
section through the low-platform truck of Fig. 1;
Figure 4 is a view in elevation of a truck
according to the invention;
Figure 5 shows the truck of the invention in
a horizontal projection of the low platform car of
Fig. 1.
Figure 6 is an elevation of the truck of the
invention shown in Fig. 4;
Figure 7 is a horizontal projection of the
truck of the invention shown in Fig. 5;
Figure 8 is a section along the line AA of
Fig. 7 through a single-wheel individual running gear
with body springing supported on the transmission
housing;

CA 02039176 1997-10-23
- 3 -
Figure 9 is a section along the line A-A of
Fig. 7 through a single-wheel individual running gear
having a spring carrier mounted on a stub axle; and
Figure 10 is a section through a link
connecting the end and middle cars.
Figs. 1 to 10 show a low-platform car
consisting of two end bodies 9 and a middle body 10.
The end bodies 9 are each supported by a truck 1. The
wheel-less middle body 10 is supported on each narrow
side via a link 8 on the truck 1. The low-platform car
is limited to rails 11. The inside of the car has no
pedestals and can be reached without step via a
footpath 12. In the region of the truck, the recesses
in the form of wheel boxes 9.1 are provided below the
seats 9.2, given parts of the truck 1 being arranged in
said wheel boxes. The low-platform car is supplied
with electric power from a trolley wire via a current
pick-up 14. The truck 1 consists of positively
controlled single-wheel individual running gears 2, a
longitudinal driver 3 connecting the single-wheel
individual running gears 2 and, on each wide side, of a
drive 4, a truck frame 5, and of a running gear control
6. On the narrow side opposite the link 8 a push-pull
device 7 acts. A single-wheel individual running gear
2 has two single wheels 2.1 with stub axles 2.2.1 which
are connected by a cranked wheel bridge 2.2 lying on
the narrow side. On the outside of the wheel, wheel
gears 2.3 and body springs 2.6 are provided.
In a first embodiment the body springs 2.6
rest via elastic spring supports 2.7 on gear housings
2.4. The elastic spring supports 2.7 permit a
horizontal turning as a function of the curves, of the

CA 02039176 1998-03-13
- 4 -
single-wheel individual running gears 2. In a further
variant a spring supporting separate from the gear
housings 2.4 is provided. The body springs 2.6 rest on
spring supports 2.5 which are mounted on the stub axles
2.2.1 which are connected by the cranked wheel bridge 2.2
or by the longitudinal driver 3. Ball turning rim
segments 2.8 permit a horizontal turning of the single-
wheel individual running gears 2 as a function of the
curve. In both embodiments, the body springs 2.6 which
are developed as flexicoil springs and the resilient
spring supports 2.7 dampen the rocking movements of the
car bodies.
The wheel bridge 2.2 is articulated centrally
by means of a pivot pin to a driver support 3.1 which,
via driver rods 3.2 and a driver equalization lever 3.3,
transmits traction and braking forces to the truck frame
5. On each wide side there are arranged on the truck
frame 5 a drive motor 4.1 with spur gearing 4.2 and brake
disk 4.5 as well as a spring-accumulator braking unit
4.4. The drive motor 4.1 drives, on the outside of the
wheel, via universal shafts 4.3 the individual wheels 2.1
lying on the wide side. In a further variant embodiment,
trucks 1 without drive 4 are provided. 2.9 Is an
electromagnetic rail brake.
The truck frame 5 consists of longitudinal
members 5.1 with spring pots 5.2 to take up the forces
produced by the end and middle bodies 9;10, of an
articulation support 5.3 lying on the narrow side for
supporting the wheel-less middle body 10 and taking up
the forces produced by it, as well as of a coupling
support 5.4 which lies opposite the link support 5.3
and on which the pull-push device 7 acts. The single-
wheel individual running gears 2 are provided on the

CA 02039176 1997-10-23
- 5 -
wheel bridges 2.2 with steering levers 2.2.2 which are
connected by means of a truck steering rod 6.1. For
the horizontal turning as a function of curves the
single-wheel individual running gears 2, the angle of
articulation between middle body 10 and end bodies 9 is
transmitted via a control lever 6.5, a steering rod
6.2, a deflection angle lever 6.3 arranged turnably on
the driver support 3.1 and a control rod 6.4 to the
steering lever 2.2.2 of the single-wheel individual
running gear lying closer to the middle body 10.
After the complete preassembly of truck 1,
the end body 9 is placed on the truck frame 5 and
fastened to it by means of fastening elements 5.5. The
middle body 10 is mounted with the articulation 8. End
bodies 9 and middle body 10 are pivotly connected to
each other by means of the joint 8. A central ring of
a tripartite ball turning rim 8.1 is firmly connected
to the pivot carrier 5.3 of the truck frame 5. An
articulation shaft 8.2 lying transverse to the
direction of travel is held in resilient mounts 8.3
which are arranged on a ring of the ball turning rim
8.1. A horizontally turnable rotary platform 8.4 is
firmly connected to an outer ring of the ball turning
rim 8.1. The joint 8 which operates in the manner of a
universal joint permits the end and middle bodies 9, 10
to carry out not only rocking movements but also
rotating movements in the horizontal and vertical
planes.
In low-platform cars with more than three
car bodies the center trucks 1 have a joint carrier 5.3
instead of the coupling carrier 5.4. In the case of
two-part low-platform cars one truck 1 is provided with
a single-wheel running gear 2.

Representative Drawing